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Wang A, Shao SR, Wu HC, Tian CX, Luo F, Li JH, Li Z, Tan H. Effect of Fluorocarbon Side Chain on the Microphase Morphology and Rheological Behavior of Thermoplastic Polyurethanes. CHINESE JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1007/s10118-022-2865-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Micelle-template synthesis of hollow silica spheres for improving water vapor permeability of waterborne polyurethane membrane. Sci Rep 2017; 7:46638. [PMID: 28429740 PMCID: PMC5399357 DOI: 10.1038/srep46638] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 03/21/2017] [Indexed: 11/08/2022] Open
Abstract
Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area. The growth of HSS was an inward-growth mechanism along template. Notably, we have provided a new and interesting fundamental principle for HSS materials by precisely controlling the ethanol-to-water volume ratio. In addition, the as-obtained HSS were mixed with waterborne polyurethane (WPU) to prepare WPU/HSS composite membrane. Various characterizations (SEM, TEM, FT-IR and TGA) revealed the morphology, polydispersity and adherence between HSS and WPU. Performance tests showed that the introduction of HSS can improve the water vapor permeability of composite membrane, promoting its water resistance and mechanical performance at the same time.
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Li Y, Ma S, Deng J, Luo Y. Study on bulk preparation and properties of glycidyl azide polymer with hydroxyl-terminated polyether elastomers obtained through step-wise curing process. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4050-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mechanical and Thermal Properties of Polyurethane Foams from Liquefied Sugar Beet Pulp. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2016. [DOI: 10.1515/ijfe-2016-0166] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Polyurethane (PU) foams were prepared from microwave liquefied sugar beet pulp (LSBP) and polymethylene polyphenyl isocyanate (PAPI) by using a one-step method. The [NCO]/[OH] ratio was increased from 0.6 to 1.2, and the effect of this ratio on the mechanical, thermal and microstructural properties of the LSBP–PU foams was studied. The allophanate, isocyanurate and free isocyanate were detected in all the foams. The thermal degradation of these foams in air occurred in two main stages; the first one occurred at 200–350 °C and the second one occurred at 300–400 °C. The Tg of the foams increased when the [NCO]/[OH] ratio increased up to 0.9 above which it decreased. As the [NCO]/[OH] ratio increased, the less regular structure and broken cell shape (observed through SEM) indicated that severe damage in structural stability and mechanical properties of LSBP–PU foams occurred. The cellular structure of the foams could be controlled by controlling the gelling and blowing reactions through the control of NCO]/[OH] ratio.
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Yuan Y, Zhang Y, Fu X, Jiang L, Liu Z, Hu K, Wu B, Lei J, Zhou C. Silane-terminated polyurethane applied to a moisture-curable pressure-sensitive adhesive using triethoxysilane. RSC Adv 2016. [DOI: 10.1039/c6ra19883j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Preparation scheme of SPU films.
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Affiliation(s)
- Ye Yuan
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Yanyan Zhang
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Xiaowei Fu
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Liang Jiang
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Zhimeng Liu
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Kai Hu
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Bo Wu
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Jinxin Lei
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Changlin Zhou
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
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Alishiri M, Shojaei A, Abdekhodaie MJ, Yeganeh H. Synthesis and characterization of biodegradable acrylated polyurethane based on poly(ε-caprolactone) and 1,6-hexamethylene diisocyanate. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 42:763-73. [PMID: 25063178 DOI: 10.1016/j.msec.2014.05.056] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 04/30/2014] [Accepted: 05/29/2014] [Indexed: 10/25/2022]
Abstract
A series of biodegradable acrylic terminated polyurethanes (APUs) based on poly(ε-caprolactone) diol (PCL), aliphatic 1,6-hexamethylene diisocyanate (HDI) and hydroxyethyl methyl acrylate (HEMA) was synthesized as potential materials for hard tissue biomedical applications. PCLs with low molecular weights of 1000 and 2,000 g/mol were employed to provide different amounts of end capped urethane acrylate in APUs. To control crosslink density, a mixture of two different reactive diluents including mono-functional HEMA and bi-functional ethylene glycol dimethacrylate (EGDMA) with different weight ratios was incorporated into the APUs, called here PUAs. Morphological characteristics and mechanical properties were investigated using X-ray diffraction (XRD), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). DMA results indicated some degree of microphase separation between hard and soft segments; however, the microphase separation is more prominent for PUAs with higher molecular weight PCL. It was also found that the degree of crosslinking dominated greatly the formation of crystalline structure. PUAs with low crosslink density exhibited crystalline microstructure. The results also indicated that the mechanical properties of PUAs were governed considerably by crystalline microstructure, and hard segment content. All PUAs demonstrated hydrophobic behavior and were able to be degraded hydrolytically. The degradation process was closely related to the microstructure and surface tension of PUAs.
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Affiliation(s)
- M Alishiri
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P. O. Box 11155-9465, Tehran, Iran
| | - A Shojaei
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P. O. Box 11155-9465, Tehran, Iran.
| | - M J Abdekhodaie
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P. O. Box 11155-9465, Tehran, Iran
| | - H Yeganeh
- Department of Polyurethane, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
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Hsu SH, Hung KC, Lin YY, Su CH, Yeh HY, Jeng US, Lu CY, Dai SA, Fu WE, Lin JC. Water-based synthesis and processing of novel biodegradable elastomers for medical applications. J Mater Chem B 2014; 2:5083-5092. [DOI: 10.1039/c4tb00572d] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel biodegradable nanoelastomers are synthesized. They can self-assemble and generate morphologies in nanometric, micrometric, or bulk scale with tunable properties. They are smart biodegradable materials with potential applications.
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Affiliation(s)
- Shan-hui Hsu
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Kun-Che Hung
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Ying-Yi Lin
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Chiu-Hun Su
- Material and Chemical Research Laboratories
- Industrial Technology Research Institute
- Hsinchu, Taiwan
| | - Hsi-Yi Yeh
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center
- Hsinchu, Taiwan
| | - Chun-Yi Lu
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Shenghong A. Dai
- Department of Chemical Engineering
- National Chung Hsing University
- Taichung, Taiwan
| | - Wei-En Fu
- National Measurement Laboratory
- Center for Measurement Standards
- Industrial Technology Research Institute of Taiwan/National Measurement Laboratory
- Hsinchu, Taiwan
| | - Jui-Che Lin
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan, Taiwan
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Talakesh MM, Sadeghi M, Chenar MP, Khosravi A. Gas separation properties of poly(ethylene glycol)/poly(tetramethylene glycol) based polyurethane membranes. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.05.033] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mondal S, Martin D. Hydrolytic degradation of segmented polyurethane copolymers for biomedical applications. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.04.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mehta J, Rouah-Martin E, Van Dorst B, Maes B, Herrebout W, Scippo ML, Dardenne F, Blust R, Robbens J. Selection and characterization of PCB-binding DNA aptamers. Anal Chem 2012; 84:1669-76. [PMID: 22166135 DOI: 10.1021/ac202960b] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants (POPs) that resist natural degradation and bioaccumulate in nature. Combined with their toxicity, this leads them to cause cancer and other health hazards. Thus, there is a vital need for rapid and sensitive methods to detect PCB residues in food and in the environment. In this study, PCB-binding DNA aptamers were developed using PCB72 and PCB106 as targets for aptamer selection. Aptamers are synthetic DNA recognition elements which form unique conformations that enable them to bind specifically to their targets. Using in vitro selection techniques and fluorometry, an aptamer that binds with nanomolar affinity to both the PCBs has been developed. It displayed high selectivity to the original target congeners and limited affinity toward other PCB congeners (105, 118, 153, and 169), suggesting general specificity for the basic PCB skeleton with varying affinities for different congeners. This aptamer provides a basis for constructing an affordable, sensitive, and high-throughput assay for the detection of PCBs in food and environmental samples and offers a promising alternative to existing methods of PCB quantitation. This study therefore advances aptamer technology by targeting one of the highly sought-after POPs, for the first time ever recorded.
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Affiliation(s)
- Jaytry Mehta
- Laboratory for Ecophysiology, Biochemistry and Toxicology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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In vitro selection and characterization of DNA aptamers recognizing chloramphenicol. J Biotechnol 2011; 155:361-9. [PMID: 21839787 DOI: 10.1016/j.jbiotec.2011.06.043] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Revised: 05/02/2011] [Accepted: 06/24/2011] [Indexed: 01/25/2023]
Abstract
Chloramphenicol (Cam), although an effective antibiotic, has lost favour due to some fatal side effects. Thus there is an urgent need for rapid and sensitive methods to detect residues in food, feed and environment. We engineered DNA aptamers that recognize Cam as their target, by conducting in vitro selections. Aptamers are nucleic acid recognition elements that are highly specific and sensitive towards their targets and can be synthetically produced in an animal-friendly manner, making them ethical innovative alternatives to antibodies. None of the isolated aptamers in this study shared sequence homology or structural similarities with each other, indicating that specific Cam recognition could be achieved by various DNA sequences under the selection conditions used. Analyzing the binding affinities of the sequences, demonstrated that dissociation constants (K(d)) in the extremely low micromolar range, which were lower than those previously reported for Cam-specific RNA aptamers, were achieved. The two best aptamers had G rich (>35%) nucleotide regions, an attribute distinguishing them from the rest and apparently responsible for their high selectivity and affinity (K(d)∼0.8 and 1μM respectively). These aptamers open up possibilities to allow easy detection of Cam via aptamer-based biosensors.
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Yeganeh H, Jangi A. Thermally curable polyurethanes containing naphthoxazine groups in the main chain. POLYM INT 2010. [DOI: 10.1002/pi.2877] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Antić VV, Pergal MV, Govedarica MN, Antić MP, Djonlagić J. Copolymers based on poly(butylene terephthalate) and polycaprolactone-block
-polydimethylsiloxane-block
-polycaprolactone. POLYM INT 2010. [DOI: 10.1002/pi.2791] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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