Toward Strong Thermoplastic Elastomers with Asymmetric Miktoarm Block Copolymer Architectures

2014 ◽  
Vol 47 (6) ◽  
pp. 2037-2043 ◽  
Author(s):  
Weichao Shi ◽  
Nathaniel A. Lynd ◽  
Damien Montarnal ◽  
Yingdong Luo ◽  
Glenn H. Fredrickson ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomers

scholarly journals Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 235
Author(s):  
Bin-Hong Tsai ◽  
Tse-An Lin ◽  
Chi-Hui Cheng ◽  
Jui-Che Lin
Keyword(s):  
Block Copolymer ◽  
Biomedical Applications ◽  
Human Life ◽  
Thermoplastic Elastomers ◽  
Wound Dressings ◽  
Tert Butyl ◽  
Soft Segments ◽  
Good Biocompatibility ◽  
Uv Ozone ◽  
Ozone Resistance

Styrenic thermoplastic elastomers (TPEs) consist of styrenic blocks. They are connected with other soft segments by a covalent linkage and are widely used in human life. However, in biomedical applications, TPEs need to be chemically hydrogenated in advance to enhance their properties such as strong UV/ozone resistance and thermal-oxidative stability. In this study, films composed of sulfonated hydrogenated TPEs were evaluated. Hydrogenated tert-butyl styrene–styrene–isoprene block copolymers were synthesized and selectively sulfonated to different degrees by reaction with acetyl sulfate. By controlling the ratio of the hydrogenated tert-butyl styrene–styrene–isoprene block copolymer and acetyl sulfate, sulfonated films were optimized to demonstrate sufficient mechanical integrity in water as well as good biocompatibility. The thermal plastic sulfonated films were found to be free of cytotoxicity and platelet-compatible and could be potential candidates in biomedical film applications such as wound dressings.

scholarly journals Sustainable Block Copolymer-based Thermoplastic Elastomers

2014 ◽  
Vol 25 (2) ◽  
pp. 121-133 ◽  
Author(s):  
Jihoon Shin ◽  
Young-Wun Kim ◽  
Geon-Joong Kim
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomers

PBA-PMMA 3-Arm Star Block Copolymer Thermoplastic Elastomers

2008 ◽  
Vol 209 (16) ◽  
pp. 1686-1693 ◽  
Author(s):  
Bruno Dufour ◽  
Kaloian Koynov ◽  
Tadeusz Pakula ◽  
Krzysztof Matyjaszewski
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomers ◽  
Star Block Copolymer

Domain Bridging in Thermoplastic Elastomers of Star Block Copolymer

2017 ◽  
Vol 50 (4) ◽  
pp. 1681-1687 ◽  
Author(s):  
Russell K. W. Spencer ◽  
Mark W. Matsen
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomers ◽  
Star Block Copolymer

Side Chain Liquid Crystalline Thermoplastic Elastomers for Actuator and Electromechanical Applications

2005 ◽  
Vol 889 ◽  
Author(s):  
Eric Verploegen ◽  
LaRuth C. McAfee ◽  
Lu Tian ◽  
Darren Verploegen ◽  
Paula T. Hammond
Keyword(s):  
Block Copolymer ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Thermoplastic Elastomer ◽  
Thermoplastic Elastomers ◽  
Liquid Crystalline Phase ◽  
Transverse Orientation ◽  
Isotropic Liquid ◽  
Polymer Backbone ◽  
Spacer Length

ABSTRACTThe synthesis of a polystyrene-b-polyvinylmethylsiloxane-b-polystyrene diblock and triblock copolymer functionalized with liquid crystals exhibiting a smectic C* phase on the PVMS central block is described. The synthetic route is based on the anionic polymerization of styrene and trimethyltrivinylsiloxane monomers and the functionalization of resulting triblock copolymers. The resulting polymer can self assemble into a thermoplastic elastomer where the high Tg styrene blocks serve as physical crosslinks for a low Tg siloxane block. The presence of a smectic liquid crystalline phase and the block copolymer mesophase are observed across various temperature ranges depending on the length of the spacer connecting the liquid crystalline moiety to the polymer backbone. The influence of mechanical deformation upon the morphologies of the liquid crystalline and block copolymer mesophases was investigated. The interactions between the smectic LC and the block copolymer morphologies and their influence upon their respective orientations in response to shear fields are detailed. The parallel-transverse orientation of the hexagonally close packed (HCP) cylinders of the block copolymer morphology and the smectic liquid crystalline phase, respectively, was observed for melt fiber drawn samples. However, the transverse-perpendicular orientation was observed for liquid crystalline block copolymers that experienced oscillatory shear. The transverse orientation of HCP cylinders was observed while shearing took place above the smectic to isotropic transition temperature, indicating that the presence of an isotropic liquid crystalline phase alters the orientation of the block copolymer morphology. Additionally, it was found that the spacer length was a key factor in the clearing points for the smectic liquid crystalline phase, as well as significantly influencing the nanophase segregation of the block copolymer.

Block Copolymer Thermoplastic Elastomers for Microcontact Printing

Langmuir ◽  
2003 ◽  
Vol 19 (26) ◽  
pp. 10957-10961 ◽  
Author(s):  
David Trimbach ◽  
Kirill Feldman ◽  
Nicholas D. Spencer ◽  
Dirk J. Broer ◽  
Cees W. M. Bastiaansen
Keyword(s):  
Block Copolymer ◽  
Microcontact Printing ◽  
Thermoplastic Elastomers

Polar Three-Arm Star Block Copolymer Thermoplastic Elastomers Based on Polyacrylonitrile

2008 ◽  
Vol 41 (7) ◽  
pp. 2451-2458 ◽  
Author(s):  
Bruno Dufour ◽  
Chuanbing Tang ◽  
Kaloian Koynov ◽  
Ying Zhang ◽  
Tadeusz Pakula ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomers ◽  
Star Block Copolymer
Sign in / Sign up

Export Citation Format

Share Document