1
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Cooper AJ, Grzetic DJ, Delaney KT, Fredrickson GH. Investigating microstructure evolution in block copolymer membranes. J Chem Phys 2024; 160:074903. [PMID: 38380746 DOI: 10.1063/5.0188196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 01/26/2024] [Indexed: 02/22/2024] Open
Abstract
Block copolymer self-assembly in conjunction with nonsolvent-induced phase separation (SNIPS) has been increasingly leveraged to fabricate integral-asymmetric membranes. The large number of formulation and processing parameters associated with SNIPS, however, has prevented the reliable construction of high performance membranes. In this study, we apply dynamical self-consistent field theory to model the SNIPS process and investigate the effect of various parameters on the membrane morphology: solvent selectivity, nonsolvent selectivity, initial film composition, and glass transition composition. We examine how solvent selectivity and concentration of polymers in the film impact the structure of micelles that connect to form the membrane matrix. In particular, we find that preserving the order in the surface layer and forming a connection between the supporting and surface layer are nontrivial and sensitive to each parameter studied. The effect of each parameter is discussed, and suggestions are made for successfully fabricating viable block copolymer membranes.
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Affiliation(s)
- Anthony J Cooper
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | | | - Kris T Delaney
- Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
| | - Glenn H Fredrickson
- Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
- Departments of Chemical Engineering and Materials, University of California, Santa Barbara, California 93106, USA
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2
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Stricker A, Hilpmann S, Mansel A, Franke K, Schymura S. Radiolabeling of Micro-/Nanoplastics via In-Diffusion. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2687. [PMID: 37836327 PMCID: PMC10574329 DOI: 10.3390/nano13192687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023]
Abstract
Micro- and nanoplastics are emerging pollutants with a concerning persistence in the environment. Research into their environmental impact requires addressing challenges related to sensitively and selectively detecting them in complex ecological media. One solution with great potential for alleviating these issues is using radiolabeling strategies. Here, we report the successful introduction of a 64Cu radiotracer into common microplastics, namely polyethylene, polyethylene terephthalate, polystyrene, polyamide, and polyvinylidene dichloride, which allows the sensitive detection of mere nanograms of substance. Utilizing a Hansen Solubility Parameter screening, we developed a swelling and in-diffusion process for tetraphenylporphyrin-complexed 64Cu, which permits one-pot labeling of polymer particles.
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Affiliation(s)
- Alexandra Stricker
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Research Site Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
| | - Stephan Hilpmann
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 03148 Dresden, Germany
| | - Alexander Mansel
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Research Site Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
| | - Karsten Franke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Research Site Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
| | - Stefan Schymura
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Research Site Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
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3
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Gupta N, Singh R, Gupta V, Jain DP, Das M. Identification of plastic rice in adulterated raw and cooked rice. Toxicol Mech Methods 2023; 33:584-589. [PMID: 37032459 DOI: 10.1080/15376516.2023.2197490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/24/2023] [Accepted: 03/25/2023] [Indexed: 04/11/2023]
Abstract
In the present study, attempts have been made to identify the presence of plastic rice in adulterated raw and cooked rice by comparing the compositional and morphological properties of fake rice and real rice using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) techniques. Various rice samples from the national capital region of India were studied for their compositional and morphological properties. The surface morphology of real rice and plastic rice was analyzed using scanning electron microscopy. Results suggest that plastic rice used as an adulterant in raw or cooked rice is made up of polystyrene, which is a well-known toxic chemical entity. The studies suggest that these techniques can be used as a scientific tool to detect and identify the presence of plastic rice in adulterated raw and cooked rice.
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Affiliation(s)
- Nidhi Gupta
- Shriram Institute for Industrial Research Delhi, Delhi, India
| | - Ruchi Singh
- Shriram Institute for Industrial Research Delhi, Delhi, India
| | - Vishal Gupta
- Shriram Institute for Industrial Research Delhi, Delhi, India
| | - Dharam Pal Jain
- Shriram Institute for Industrial Research Delhi, Delhi, India
| | - Mukul Das
- Shriram Institute for Industrial Research Delhi, Delhi, India
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4
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Epure EL, Oniciuc SD, Hurduc N, Drăgoi EN. Artificial Neural Network Modeling of Glass Transition Temperatures for Some Homopolymers with Saturated Carbon Chain Backbone. Polymers (Basel) 2021; 13:polym13234151. [PMID: 34883654 PMCID: PMC8659568 DOI: 10.3390/polym13234151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 11/16/2022] Open
Abstract
The glass transition temperature (Tg) is an important decision parameter when synthesizing polymeric compounds or when selecting their applicability domain. In this work, the glass transition temperature of more than 100 homopolymers with saturated backbones was predicted using a neuro-evolutive technique combining Artificial Neural Networks with a modified Bacterial Foraging Optimization Algorithm. In most cases, the selected polymers have a vinyl-type backbone substituted with various groups. A few samples with an oxygen atom in a linear non-vinyl hydrocarbon main chain were also considered. Eight structural, thermophysical, and entanglement properties estimated by the quantitative structure-property relationship (QSPR) method, along with other molecular descriptors reflecting polymer composition, were considered as input data for Artificial Neural Networks. The Tg's neural model has a 7.30% average absolute error for the training data and 12.89% for the testing one. From the sensitivity analysis, it was found that cohesive energy, from all independent parameters, has the highest influence on the modeled output.
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5
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Driscoll OJ, Stewart JA, McKeown P, Jones MD. Ring-Opening Copolymerization Using Simple Fe(III) Complexes and Metal- and Halide-Free Organic Catalysts. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01211] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Oliver J. Driscoll
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Jack A. Stewart
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Paul McKeown
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Matthew D. Jones
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
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6
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Rigid amorphous fraction and crystallinity in cold-crystallized syndiotactic polystyrene: Characterization by differential scanning calorimetry. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Mechanical Property of Polypropylene Gels Associated with That of Molten Polypropylenes. Gels 2021; 7:gels7030099. [PMID: 34449615 PMCID: PMC8395817 DOI: 10.3390/gels7030099] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/09/2021] [Accepted: 07/20/2021] [Indexed: 01/17/2023] Open
Abstract
This study aims to understand the fundamental mechanical relationship between polypropylene (PP)-gels and solid PPs without solvent through mechanical and thermal analyses, by which the mechanical similarities between molten PPs and PP gels were found, leading to the reliable estimate of the mechanical properties of semi-crystalline gels. The gelation of syndiotactic and isotactic polypropylenes (sPP and iPP) was found when PPs were dissolved in 1,2,3,4-tetrahydronaphthalene (tetralin). Interestingly, it was found that the storage modulus of sPP-gel became higher than that of iPP-gel at low PP concentration (<~40 wt%). The result was distinctly different from the result of neat solid PPs (without solvent), where the modulus of solid sPP is generally significantly lower than that of solid iPP. Such inversion behavior in the mechanical property of semi-crystalline gels had not been reported and discussed before. By further investigation of the storage moduli of neat sPP and iPP, it was found that the storage modulus of sPP became higher than that of iPP above the melting points of PP, which was similar to the behavior of the storage moduli observed in the diluted PP-gels. Such similarity between PP-gels and PP melts was also observed within iPP samples with different molecular weights.
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8
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Rejek T, Schweizer P, Joch D, Portilla L, Spiecker E, Halik M. Buried Microphase Separation by Dynamic Interplay of Crystallization and Microphase Separation in Semicrystalline PEO-Rich PS- b-PEO Block Copolymer Thin Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tobias Rejek
- Organic Materials and Devices, Institute of Polymer Materials, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
| | - Peter Schweizer
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
| | - Daniel Joch
- Organic Materials and Devices, Institute of Polymer Materials, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
| | - Luis Portilla
- Organic Materials and Devices, Institute of Polymer Materials, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
| | - Marcus Halik
- Organic Materials and Devices, Institute of Polymer Materials, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen, Germany
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9
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Biswal AK, Saha S. Controllable fabrication of biodegradable Janus and multi-layered particles with hierarchically porous structure. J Colloid Interface Sci 2020; 566:120-134. [DOI: 10.1016/j.jcis.2020.01.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/15/2020] [Accepted: 01/19/2020] [Indexed: 10/25/2022]
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10
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Fugolin AP, Dobson A, Ferracane JL, Pfeifer CS. Effect of residual solvent on performance of acrylamide-containing dental materials. Dent Mater 2019; 35:1378-1387. [PMID: 31378307 PMCID: PMC6750967 DOI: 10.1016/j.dental.2019.07.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/06/2019] [Accepted: 07/10/2019] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Methacrylamide-based monomers are being pursued as novel, hydrolytically stable materials for use in dental adhesives. The impact of residual solvents, due to the chemical synthesis procedures or the need for solvated adhesives systems, on the kinetics of polymerization and mechanical properties was the aim of the present investigation. METHODS Two base monomers (70wt% BisGMA or HEMAM-BDI - newly synthesized secondary methacrylamide) were combined with 30wt% N,N-dimethylacrylamide. Eethyl acetate (EtOAc), or 75vol% ethanol/25vol% water (EtOH/H2O) were added as solvents in concentrations of 2, 5, 15 and 20wt%. The resins were made polymerizable by the addition of 0.2wt% 2,2-dimethoxy-2-phenyl acetophenone (DMPA) and 0.4wt% diphenyliodonium hexafluorophosphate (DPI-PF6). Specimens (n=3) were photoactivated with a mercury arc lamp (Acticure 4000, 320-500nm, 250mW/cm2) for 5min. Degree of conversion (DC, %) was tracked in near-IR spectroscopy in real time and yield strength and modulus of elasticity were measured in three-point bending after dry and wet storage (n=6). The data was subject to one-way ANOVA/Tukey's Test (p≤0.05), or Student's t-test (p≤0.001). RESULTS In all groups for both BisGMA and HEMAM-BDI-based materials, DC and DC at Rpmax increased and maximum rate of polymerization decreased as solvent concentration increased. Despite the increased DC, BisGMA mixtures showed a decrease in FS starting at 5wt% EtOAc or 15wt% EtOH/H2O. Yield strength for the HEMAM-BDI groups was overall lower than that of the BisGMA groups, but the modulus of elasticity was significantly higher. SIGNIFICANCE The presence of residual solvent, from manufacturing or from practitioner's handling, affects polymerization kinetics and mechanical properties of resins. Methacrylates appear to be more strongly influenced than methacrylamides.
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Affiliation(s)
- Ana P Fugolin
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR, USA
| | - Adam Dobson
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR, USA
| | - Jack L Ferracane
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR, USA
| | - Carmem S Pfeifer
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR, USA.
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11
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Matsumoto K, Kageyama Y. Increased Production and Molecular Weight of Artificial Polyhydroxyalkanoate Poly(2-hydroxybutyrate) Above the Glass Transition Temperature Threshold. Front Bioeng Biotechnol 2019; 7:177. [PMID: 31428606 PMCID: PMC6689969 DOI: 10.3389/fbioe.2019.00177] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 07/09/2019] [Indexed: 11/13/2022] Open
Abstract
Poly(2-hydroxybutyrate) [P(2HB)] is an artificial polyhydroxyalkanoate (PHA) synthesized using engineered 2-hydroxyalkanoate-polymerizing PHA synthase. In the present study, the effect of temperature on P(2HB) synthesis was investigated. Recombinant Escherichia coli harboring PHA synthetic genes were cultivated with 2HB and 3-hydroxybutyrate (3HB) supplementation at varied temperatures ranging from 24 to 36°C for the synthesis of P(2HB) and natural PHA P(3HB), respectively. P(2HB) production and its molecular weight increased considerably at a threshold temperature of 32-34°C. The trend was not observed during the synthesis of P(3HB). Notably, the threshold temperature was close to the glass transition temperature (T g) of P(2HB) (30°C), while the T g of P(3HB) (4°C) was much lower than the cultivation temperature. The results suggest that thermal motion of the polymer chains influenced the production and molecular weight of the obtained polymer. According to the results, the production and molecular weight of PHA drastically changes at the threshold temperature, which is linked to the T g of the polymer. The hypothesis should be applicable to PHAs in general, and potentially explains the inability to biosynthesize high-molecular-weight polylactate homopolymer with a T g of 60°C.
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Affiliation(s)
- Ken'ichiro Matsumoto
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Yuki Kageyama
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Japan
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12
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Shaiju P, Murthy NS, Gowd EB. Nonsolvent-induced morphological changes and nanoporosity in poly(l-lactide) films. SOFT MATTER 2018; 14:1492-1498. [PMID: 29404553 DOI: 10.1039/c8sm00041g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The role of a nonsolvent in controlling the crystallization and morphology of solvent-crystallized poly(l-lactide) (PLLA) films was investigated using various microscopy techniques and small- and wide-angle X-ray scattering (SAXS/WAXS). PLLA films crystallized in THF and acetone had 40-80 μm spherulites. When water was present in the solvent, a completely different morphology was observed with nanosized voids and the surfaces of the films were smooth. In contrast, SEM studies revealed that the films crystallized in acetone and THF which had macroporous structures, had larger voids and film surfaces were rough because of the presence of globular structures. Voids appeared within the spherulites in the THF/water treated film, whereas crystals nucleated at the surface of the nanosized voids in acetone/water treated PLLA films. The formation of such voids is attributed to the interface-enhanced crystal nucleation in a solvent/nonsolvent system where the nonsolvent increases the polymer crystal nucleation and the subsequent evaporation of the nonsolvent. The method described in this work can be extended to other polymers to control the morphologies of polymer films during solvent-induced crystallization.
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Affiliation(s)
- P Shaiju
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
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13
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Wu C. Re-examining the procedure for simulating polymer Tg using molecular dynamics. J Mol Model 2017; 23:270. [DOI: 10.1007/s00894-017-3439-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 08/07/2017] [Indexed: 12/01/2022]
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14
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Raupp SM, Siebel DK, Kitz PG, Scharfer P, Schabel W. Interdiffusion in Polymeric Multilayer Systems Studied by Inverse Micro-Raman Spectroscopy. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebastian M. Raupp
- Institute
of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
- InnovationLab,
Heidelberg, 69115 Heidelberg, Germany
| | - David K. Siebel
- Institute
of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Paul G. Kitz
- Institute
of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - P. Scharfer
- Institute
of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
- InnovationLab,
Heidelberg, 69115 Heidelberg, Germany
| | - W. Schabel
- Institute
of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
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15
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Kummara S, Tashiro K. Isotope effect on the structural evolution process in the isothermal crystallization phenomenon of polyoxymethylene. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Guo C, Huo H. Poor solvent as a nucleating agent to induce poly(ε-caprolactone) ultrathin film crystallization on poly(vinylpyrrolidone) substrate. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-015-3821-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Shaiju P, Murthy NS, Gowd EB. Molecular, Crystalline, and Lamellar Length-Scale Changes in the Poly(l-lactide) (PLLA) during Cyclopentanone (CPO) Desorption in PLLA/CPO Cocrystals. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b02425] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- P. Shaiju
- Materials
Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific
and Innovative Research (AcSIR), New Delhi 110 001, India
| | - N. Sanjeeva Murthy
- New
Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - E. Bhoje Gowd
- Materials
Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific
and Innovative Research (AcSIR), New Delhi 110 001, India
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18
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Durham OZ, Norton HR, Shipp DA. Functional polymer particles via thiol–ene and thiol–yne suspension “click” polymerization. RSC Adv 2015. [DOI: 10.1039/c5ra12553g] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Highly functionalized, water-borne, micron-sized polymer particles were synthesized using thermally or photochemically initiated thiol–ene and thiol–yne “click” suspension polymerizations.
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Affiliation(s)
- Olivia Z. Durham
- Department of Chemistry & Biomolecular Science & Center for Advanced Materials Processing
- Clarkson University
- Potsdam
- USA
| | - Hannah R. Norton
- Department of Chemistry & Biomolecular Science & Center for Advanced Materials Processing
- Clarkson University
- Potsdam
- USA
| | - Devon A. Shipp
- Department of Chemistry & Biomolecular Science & Center for Advanced Materials Processing
- Clarkson University
- Potsdam
- USA
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19
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Wu N, Lang S, Zhang H, Ding M, Zhang J. Solvent-Induced Crystallization Behaviors of PLLA Ultrathin Films Investigated by RAIR Spectroscopy and AFM Measurements. J Phys Chem B 2014; 118:12652-9. [DOI: 10.1021/jp506840e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Ningjing Wu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Shuguo Lang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Hong Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Meichun Ding
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Jianming Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
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20
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Influence of host preparation method on the structural phase transitions of syndiotactic polystyrene upon the guest exchange with n-alkanes. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.10.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Park CH, Jeong L, Cho D, Kwon OH, Park WH. Effect of methylcellulose on the formation and drug release behavior of silk fibroin hydrogel. Carbohydr Polym 2013; 98:1179-85. [PMID: 23987461 DOI: 10.1016/j.carbpol.2013.07.028] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 07/05/2013] [Accepted: 07/10/2013] [Indexed: 12/01/2022]
Abstract
In this study, methylcellulose (MC) was used to control the gelation time of silk fibroin (SF) aqueous solution. The gelation time was measured using a Vibro Viscometer at 50 °C. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and a texture meter were used to investigate the effect of MC on the hydrogelation of SF solution. SF/MC hydrogels could be formed by the addition of MC, although their gelation time was increased with MC content. To examine the conformational change of SF/MC hydrogels, time-resolved FT-IR spectra were obtained at constant temperature using a custom-made IR chamber. From FT-IR spectra focused on the amide I peak position, the transition of SF molecules in SF/MC solution from a random coil to a β-sheet structure was inhibited in the presence of MC molecules. In addition, the drug release of SF/MC hydrogels loaded with 5-aminosalicylic acid was studied in 2-dimensional (2-D) and 3-dimensional (3-D) conditions in vitro. The drug release behavior of SF or SF/MC hydrogels was measured using UV-Vis spectroscopy. The release rate of 5-aminosalicylic acid in SF/MC hydrogel was lower than that of SF hydrogel, which may be closely associated with the hydrophilic interaction between MC and 5-aminosalicylic acid. This approach to controlling the sol-gel transition and the drug release of SF hydrogels by the addition of MC will be useful in the design and tailoring of novel materials for biomedical applications.
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Affiliation(s)
- Cho Hee Park
- Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, South Korea
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Huang S, Li H, Shang Y, Yu D, Li G, Jiang S, Chen X, An L. Chloroform micro-evaporation induced ordered structures of poly(l-lactide) thin films. RSC Adv 2013. [DOI: 10.1039/c3ra41266k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Bianco S, Caron V, Tajber L, Corrigan OI, Nolan L, Hu Y, Healy AM. Modification of the solid-state nature of sulfathiazole and sulfathiazole sodium by spray drying. AAPS PharmSciTech 2012; 13:647-60. [PMID: 22549223 DOI: 10.1208/s12249-012-9792-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 04/10/2012] [Indexed: 11/30/2022] Open
Abstract
Solid-state characterisation of a drug following pharmaceutical processing and upon storage is fundamental to successful dosage form development. The aim of the study was to investigate the effects of using different solvents, feed concentrations and spray drier configuration on the solid-state nature of the highly polymorphic model drug, sulfathiazole (ST) and its sodium salt (STNa). The drugs were spray-dried from ethanol, acetone and mixtures of these organic solvents with water. Additionally, STNa was spray-dried from pure water. The physicochemical properties including the physical stability of the spray-dried powders were compared to the unprocessed materials. Spray drying of ST from either acetonic or ethanolic solutions with the spray drier operating in a closed cycle mode yielded crystalline powders. In contrast, the powders obtained from ethanolic solutions with the spray drier operating in an open cycle mode were amorphous. Amorphous ST crystallised to pure form I at ≤35 % relative humidity (RH) or to polymorphic mixtures at higher RH values. The usual crystal habit of form I is needle-like, but spherical particles of this polymorph were generated by spray drying. STNa solutions resulted in an amorphous material upon processing, regardless of the solvent and the spray drier configuration employed. Moisture induced crystallisation of amorphous STNa to a sesquihydrate, whilst crystallisation upon heating gave rise to a new anhydrous polymorph. This study indicated that control of processing and storage parameters can be exploited to produce drugs with a specific/desired solid-state nature.
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Tripathi A, Srivastava AK. Diphenyl-ditelluride-initiated alternating co-polymerization of N-vinyl-2-pyrrolidone with methyl methacrylate. Des Monomers Polym 2012. [DOI: 10.1163/156855506777351036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Singh A, Kamal M, Singh DK. Diphenylselenonium 2,3,4,5-tetraphenylcyclopentadienylide-initiated polymerization of styrene and acrylonitrile: Synthesis, characterization, reactivity ratios, and thermal properties. J Appl Polym Sci 2011. [DOI: 10.1002/app.33792] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Park H, Choi S, Lee JP, Park S. Fabrication of highly ordered silicon pin-in-a-hole nanostructures via chemical etching of nanopatterned polymer masks. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10812c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Spatial control of dewetting: Highly ordered Teflon nanospheres. J Colloid Interface Sci 2010; 348:416-23. [DOI: 10.1016/j.jcis.2010.05.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 04/23/2010] [Accepted: 05/03/2010] [Indexed: 11/22/2022]
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Li W, Wu P. Study on the crystalline structure transition of syndiotactic polystyrene film during heat treatment by two-dimensional infrared correlation spectroscopy. APPLIED SPECTROSCOPY 2009; 63:926-931. [PMID: 19678990 DOI: 10.1366/000370209788964494] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The crystal structure transition of syndiotactic polystyrene film from the helical conformation to the more stable planar zigzag conformation during a heating process was studied using Fourier transform infrared (FT-IR) spectroscopy in combination with two-dimensional (2D) correlation analysis and perturbation-correlation moving-window 2D analysis. The sequence of different conformations during the transition was investigated by analyzing two-dimensional FT-IR correlation spectra in the spectral ranges of 800-700 cm(-1) and 600-500 cm(-1). It was observed that the conformation of delta helical changes prior to gamma helical, and the gamma helical phase is faster than the alpha' planar zigzag phase. By utilizing the 2D asynchronous correlation spectra, the 744 cm(-1) band, which is usually incorporated in the broad 750 cm(-1) band, can now be uniquely attributed as the alpha' zigzag configuration for the first time. Furthermore, by employing thermal perturbation, the shorter helical segments consisting of m = 7-12 and m = 12-20 monomeric units were disturbed in a shorter time than the longer helical segments m = 20-30 during the heating process.
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Affiliation(s)
- Weizhen Li
- The Key Laboratory of Molecular Engineering of Polymers (Ministry of Education) and Department of Macromolecular Science and the Laboratory of Advanced Materials, Fudan University, Shanghai 200433, P.R. China
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Reddy KR, Tashiro K, Sakurai T, Yamaguchi N, Sasaki S, Masunaga H, Takata M. Isothermal Crystallization Behavior of Isotactic Polypropylene H/D Blends as Viewed from Time-Resolved FTIR and Synchrotron SAXS/WAXD Measurements. Macromolecules 2009. [DOI: 10.1021/ma900265u] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kummetha Raghunatha Reddy
- Department of Future Industry-oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Kohji Tashiro
- Department of Future Industry-oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Takashi Sakurai
- Petrochemicals Research Laboratory, Sumitomo Chemical Co. Ltd. Kitasode, Sodegaura, Chiba 299-0295, Japan
| | - Noboru Yamaguchi
- Petrochemicals Research Laboratory, Sumitomo Chemical Co. Ltd. Kitasode, Sodegaura, Chiba 299-0295, Japan
| | - Sono Sasaki
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo, 679-5198, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo, 679-5198, Japan
| | - Masaki Takata
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo, 679-5198, Japan
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TASHIRO K, REDDY KR, NISHIYAMA A, HANESAKA M, TSUJI S, HASHIDA T, WEIYU C, MASUNAGA H, SASAKI S, TAKATA M. Evolution Process of Regular Structure in Isothermal Crystallization Phenomena of Crystalline Polymers Viewed from Synchrotron Small- and Wide-Angle X-ray Scatterings and Vibrational Spectroscopy. KOBUNSHI RONBUNSHU 2009. [DOI: 10.1295/koron.66.536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Albunia AR, Annunziata L, Guerra G. Guest-Induced Syndiotactic Polystyrene Cocrystal Formation from γ and α Phases. Macromolecules 2008. [DOI: 10.1021/ma7026275] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexandra R. Albunia
- Università degli Studi di Salerno, Dipartimento di Chimica and INSTM Research Unit, Via Ponte don Melillo, 84084, Fisciano, Italy
| | - Loredana Annunziata
- Università degli Studi di Salerno, Dipartimento di Chimica and INSTM Research Unit, Via Ponte don Melillo, 84084, Fisciano, Italy
| | - Gaetano Guerra
- Università degli Studi di Salerno, Dipartimento di Chimica and INSTM Research Unit, Via Ponte don Melillo, 84084, Fisciano, Italy
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Tripathi A, Srivastava AK, Khandelwal BL. Synthesis of tellurium containing syndiotactic polymethyl methacrylate using diphenyl ditelluride as a novel initiator. J Appl Polym Sci 2006. [DOI: 10.1002/app.24111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kasapis S, Sablani SS. A fundamental approach for the estimation of the mechanical glass transition temperature in gelatin. Int J Biol Macromol 2005; 36:71-8. [PMID: 15878197 DOI: 10.1016/j.ijbiomac.2005.03.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2005] [Revised: 03/27/2005] [Accepted: 03/28/2005] [Indexed: 11/18/2022]
Abstract
The paper constitutes an attempt to overcome the empiricism prevalent in the estimation of the glass transition temperature (Tg) of gelatin networks using rheological techniques. In doing so, it presents a study of the viscoelastic properties of a well-characterised gelatin sample covering the structural properties from the rubbery region to the glassy state. The pattern of oscillatory behaviour on shear is given by a master curve produced by shifting data obtained at different temperatures along the logarithmic time scale. Data reduction does not hold for all temperatures thus giving rise to thermorheological complexity. Within the temperature range at which molecular processes are represented by a simple distribution of relaxation times, a fundamental argument is developed to pinpoint the mechanical Tg. This should improve confidence in measured glassy properties over the empirical indicators found in the literature. As a demonstration, the glass transition temperature of gelatin at "zero moisture" obtained using the proposed framework of analysis is contrasted with earlier attempts to identify the mechanical Tg of gelatin solids.
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Affiliation(s)
- Stefan Kasapis
- Department of Chemistry, National University of Singapore, Block S3, Level 6, Science Drive 4, Singapore 117548, Singapore.
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Free Radical Polymerisation of Methylmethacrylate Using p-nitrobenzyltriphenyl Phosphonium Ylide as Novel Initiator. JOURNAL OF POLYMER RESEARCH 2005. [DOI: 10.1007/s10965-005-9011-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Uda Y, Kaneko F, Kawaguchi T. Guest Exchange with n-Alkanes and Host−Guest Interactions in the Clathrate Phase of Syndiotactic Polystyrene. Macromolecules 2005. [DOI: 10.1021/ma047723d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yukihiro Uda
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Fumitoshi Kaneko
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Tatsuya Kawaguchi
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Uda Y, Kaneko F, Kawaguchi T. Selective Guest Uptake from Solvent Mixtures in the Clathrate Phase of Syndiotactic Polystyrene. Macromol Rapid Commun 2004. [DOI: 10.1002/marc.200400328] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Gupper A, Chan KLA, Kazarian SG. FT-IR Imaging of Solvent-Induced Crystallization in Polymers. Macromolecules 2004. [DOI: 10.1021/ma049313v] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Andreas Gupper
- Department of Chemical Engineering and Chemical Technology, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - K. L. Andrew Chan
- Department of Chemical Engineering and Chemical Technology, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Sergei G. Kazarian
- Department of Chemical Engineering and Chemical Technology, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
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