1
|
Perala SK, Ramakrishnan S. Orthogonally clickable hyperbranched polymers: effect of reactant size and polarity on core-functionalization of peripherally jacketed HBPs. Polym Chem 2019. [DOI: 10.1039/c8py01499j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Using an orthogonally clickable strategy, the accessibility of internal allyl groups in jacketed HBPs, bearing either PEG or docosyl peripheral segments, was shown to depend both on the size and relative polarity of the reactant thiol.
Collapse
Affiliation(s)
- Suresh Kumar Perala
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - S. Ramakrishnan
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| |
Collapse
|
2
|
Ansari M, Mallik S, Mondal S, Bera R, Jana A, Nayak A, Das N. Triptycene-based fluorescent polymers with pendant alkyl chains: interaction with fullerenes and morphology of thin films. POLYM INT 2018. [DOI: 10.1002/pi.5737] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Mosim Ansari
- Department of Chemistry; Indian Institute of Technology Patna; Bihar India
| | - Samapika Mallik
- Department of Physics; Indian Institute of Technology Patna; Bihar India
| | - Snehasish Mondal
- Department of Chemistry; Indian Institute of Technology Patna; Bihar India
| | - Ranajit Bera
- Department of Chemistry; Indian Institute of Technology Patna; Bihar India
| | - Achintya Jana
- Department of Chemistry; Indian Institute of Technology Patna; Bihar India
| | - Alpana Nayak
- Department of Physics; Indian Institute of Technology Patna; Bihar India
| | - Neeladri Das
- Department of Chemistry; Indian Institute of Technology Patna; Bihar India
| |
Collapse
|
3
|
Varaprasad NSS, Ramakrishnan S. Hybrasurfs-A New Class of Hyperbranched Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11464-11472. [PMID: 30156421 DOI: 10.1021/acs.langmuir.8b02022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A hyperbranched (HB) polyester carrying peripheral allyl groups was prepared by melt-condensation of a suitably designed AB2 monomer bearing two allyl ester groups and one hydroxyl group. The periphery of the hyperbranched polymer was co-clicked with two different organic thiols, namely, hexadecane thiol and 3-mercaptopropionic acid, using the thiol-ene reaction. Three different samples with varying mole fractions of the hydrophilic carboxylic acid groups were prepared; the conformational adaptability of the hyperbranched polymer backbone permitted these amphiphilic systems to form Janus structures that exhibit surfactant-like properties and, therefore, we have termed them hybrasurfs. These polymers behave like clusters of surfactants that have been stitched at the waist by the HB polymer backbone; the Langmuir isotherms revealed the formation of a monolayer, and in two of the samples having higher mole fractions of hexadecyl segments a weak inflection in the isotherm is seen. This suggests a densification, typically implying the crystallization of the alkyl segment at the air-water interface. The monolayers were transferred onto a substrate, and their heights were estimated using atomic force microscopy; the values thus obtained were in reasonable agreement with the expected value. The water contact angles of the substrates bearing the transferred monolayers of the three different samples (transferred at two different points along the isotherm) were measured; it was seen that the sample carrying the highest mole fraction of hexadecyl chains exhibited a significantly larger contact angle when compared to that of the other two samples. Interestingly, these hybrasurfs also formed vesicles in water and were shown to encapsulate water-soluble dyes, such as Eosin Y. Thus, this class of readily accessible amphiphilic HB polymers that behave as a cluster of surfactants opens some interesting possibilities for further exploration.
Collapse
Affiliation(s)
- N S Shree Varaprasad
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - S Ramakrishnan
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
| |
Collapse
|
4
|
Perala SK, Ramakrishnan S. Effect of Spacer Stiffness on the Properties of Hyperbranched Polymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Suresh Kumar Perala
- Department of Inorganic and
Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - S. Ramakrishnan
- Department of Inorganic and
Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
5
|
Samuel AZ, Lai BH, Lan ST, Ando M, Wang CL, Hamaguchi HO. Estimating Percent Crystallinity of Polyethylene as a Function of Temperature by Raman Spectroscopy Multivariate Curve Resolution by Alternating Least Squares. Anal Chem 2017; 89:3043-3050. [DOI: 10.1021/acs.analchem.6b04750] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | | | | | - Masahiro Ando
- Waseda University, Consolidated Research Institute
for Advanced Science and Medical Care, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan
| | | | | |
Collapse
|
6
|
Li PY, He C, Li JM, Li LW, Ye XD, He WD. Long-subchain Janus-dendritic copolymers from locally confined click reaction and generation-dependent micro-phase separation. Polym Chem 2017. [DOI: 10.1039/c7py00551b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Long-subchain Janus-dendritic copolymers composed of PSt and PtBA half-dendrons, up to the third generation, were prepared under alternating chemical and local confinement. All the Janus-dendritic copolymers exhibited generation-dependent microphase separation.
Collapse
Affiliation(s)
- Peng-Yun Li
- Key Laboratory of Soft Matter Chemistry
- Chinese Academy of Sciences
- and Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Chen He
- Key Laboratory of Soft Matter Chemistry
- Chinese Academy of Sciences
- and Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Jia-Min Li
- Key Laboratory of Soft Matter Chemistry
- Chinese Academy of Sciences
- and Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Lian-Wei Li
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei
- China
| | - Xiao-Dong Ye
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei
- China
| | - Wei-Dong He
- Key Laboratory of Soft Matter Chemistry
- Chinese Academy of Sciences
- and Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| |
Collapse
|
7
|
Samuel AZ, Zhou M, Ando M, Mueller R, Liebert T, Heinze T, Hamaguchi HO. Determination of Percent Crystallinity of Side-Chain Crystallized Alkylated-Dextran Derivatives with Raman Spectroscopy and Multivariate Curve Resolution. Anal Chem 2016; 88:4644-50. [DOI: 10.1021/acs.analchem.5b04075] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ashok Zachariah Samuel
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan
| | - Mengbo Zhou
- Institute
of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstrasse 10, D-07743 Jena, Germany
| | - Masahiro Ando
- Waseda University, Consolidated Research Institute
for Advanced Science and Medical Care, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Robert Mueller
- Leibniz Institute of Photonic Technology e.V. (IPHT), Postfach 100239, D-07702 Jena, Germany
| | - Tim Liebert
- Institute
of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstrasse 10, D-07743 Jena, Germany
| | - Thomas Heinze
- Institute
of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstrasse 10, D-07743 Jena, Germany
| | - Hiro-o Hamaguchi
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan
| |
Collapse
|
8
|
Synthesis of telechelic perfluorocarbon functionalized polystyrene and polybutylmethacrylate and characterization of their blends. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.05.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
9
|
Tillet G, Lopez G, Hung MH, Améduri B. Crosslinking of fluoroelastomers by “click” azide-nitrile cycloaddition. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/pola.27549] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Guillaume Tillet
- Institut Charles Gerhardt de Montpellier (ICGM)-UMR5253; Ingénierie et Architectures Macromoléculaires (IAM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), 8 Rue de l'Ecole Normale; 34296 Montpellier France
| | - Gérald Lopez
- Institut Charles Gerhardt de Montpellier (ICGM)-UMR5253; Ingénierie et Architectures Macromoléculaires (IAM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), 8 Rue de l'Ecole Normale; 34296 Montpellier France
| | - Ming-Hong Hung
- DuPont Performance Polymers; P.O. Box 80293 Wilmington Delaware 19880-0293
| | - Bruno Améduri
- Institut Charles Gerhardt de Montpellier (ICGM)-UMR5253; Ingénierie et Architectures Macromoléculaires (IAM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), 8 Rue de l'Ecole Normale; 34296 Montpellier France
| |
Collapse
|
10
|
Chatterjee S, Ramakrishnan S. Understanding Self-Segregation of Immiscible Peripheral Segments in Pseudodendritic Hyperbranched Polydithioacetals: Formation of Improved Janus Structures. ACS Macro Lett 2014; 3:953-957. [PMID: 35596367 DOI: 10.1021/mz500424t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Peripherally heterofunctionalized hyperbranched polymers (HBPs) undergo immiscibility-driven self-segregation of the outer segments to form Janus molecular entities (Macromolecules 2012, 45, 2348). In HBPs prepared via AB2 type self-condensation, single-step peripheral heterofunctionalization would lead to random distribution of the two types of terminal units, namely, homofunctionalized (homo-T) and heterofunctionalized (hetero-T) termini. Here, we examine the role of such hetero-T units on the self-segregation of heterofunctionalized pseudodendritic hyperbranched polydithioacetals. Three different heterofunctionalized HB dithioacetals bearing roughly 50 mol % each of docsyl (C-22) and MPEG-350 chains at the periphery were prepared: one of them carried a statistical distribution of homo-T and hetero-T units, and the other carried only two types of homo-T (-TR1R1 and -TR2R2) termini, whereas the third carried largely hetero-T (-TR1R2) termini. Careful examination of DSC and SAXS data reveals that the self-segregation is most effective in HBPs devoid of hetero-T units; interestingly, however, it also showed that randomly heterofunctionalized HBPs self-segregated nearly as effectively.
Collapse
Affiliation(s)
- Saptarshi Chatterjee
- Department
of Inorganic and
Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - S. Ramakrishnan
- Department
of Inorganic and
Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
11
|
|
12
|
Large scale synthesis of Janus nanotubes and derivative nanosheets by selective etching. J Colloid Interface Sci 2014; 420:1-8. [DOI: 10.1016/j.jcis.2013.12.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 11/13/2013] [Accepted: 12/30/2013] [Indexed: 11/21/2022]
|
13
|
Mettu S, Kanungo M, Law KY. Anomalous thermally induced pinning of a liquid drop on a solid substrate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10665-10673. [PMID: 23899384 DOI: 10.1021/la400991y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The effect of substrate temperature on the wetting and spreading behavior of a UV ink monomer has been studied as a surrogate for the ink on four different substrates: DTC (digital top coat)-coated BOPP (biaxial oriented polypropylene), Flexo-coated BOPP, DTC-coated SGE (semigloss elite) paper, and Flexo-coated SGE paper. Results show that the dynamic contact angles of the monomer decrease exponentially over time after contacting the surface, and the rate of spreading is consistently higher at 95 °C than at 22 °C. This observation indicates that spreading is controlled by the viscosity of the monomer as it decreases with temperature. An anomalous temperature effect is observed for the static contact angle on the DTC-coated BOPP substrate. The static contact angle at 95 °C is significantly larger than that at 22 °C (52° versus 30°). This is counterintuitive, as the surface tension of the monomer is shown to decease with increasing temperature. Microscopy (SEM and AFM) studies suggest that there is little interaction between the DTC coating solution and the BOPP substrate during the fast-drying coating process. This results in a smooth coated surface and, more importantly, voids between the BOPP nanofibers underneath the DTC coating. As the DTC-BOPP substrate is heated to 95 °C, fiber expansions occur. Microscopy results show that nanosized protrusions are formed on the DTC surface. We attribute it to fiber expansions in the vertical direction. Fiber expansions in the lateral direction causes little surface morphology change as the expanded materials only fill the voids laterally between the nanofiber network. We suggest that the protrusions on the surface create strong resistance to the wetting process and pin the monomer drop into a metastable wetting state. This interpretation is supported by the sliding angle and sessile drop height experiments.
Collapse
Affiliation(s)
- Srinivas Mettu
- Xerox Corp., Xerox Research Center Webster, 800 Phillips Rd, 147-59B, Webster, New York 14580, United States
| | | | | |
Collapse
|