scholarly journals All-Polycarbonate Thermoplastic Elastomers Based on Triblock Copolymers Derived from Triethylborane-Mediated Sequential Copolymerization of CO2 with Various Epoxides

2020 ◽  
Vol 53 (13) ◽  
pp. 5297-5307 ◽  
Author(s):  
Mingchen Jia ◽  
Dongyue Zhang ◽  
Gijs W. de Kort ◽  
Carolus H. R. M. Wilsens ◽  
Sanjay Rastogi ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers

scholarly journals Synthesis, Properties, and Biodegradability of Thermoplastic Elastomers Made from 2-Methyl-1,3-propanediol, Glutaric Acid and Lactide

Life ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 43
Author(s):  
Lamya Zahir ◽  
Takumitsu Kida ◽  
Ryo Tanaka ◽  
Yuushou Nakayama ◽  
Takeshi Shiono ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glutaric Acid ◽  
Triblock Copolymers ◽  
Tensile Tests ◽  
Thermoplastic Elastomers ◽  
Proteinase K ◽  
Synthesis Properties

An innovative type of biodegradable thermoplastic elastomers with improved mechanical properties from very common and potentially renewable sources, poly(L-lactide)-b-poly(2-methyl-1,3-propylene glutarate)-b-poly(L-lactide) (PLA-b-PMPG-b-PLA)s, has been developed for the first time. PLA-b-PMPG-b-PLAs were synthesized by polycondensation of 2-methyl-1,3-propanediol and glutaric acid and successive ring-opening polymerization of L-lactide, where PMPG is an amorphous central block with low glass transition temperature and PLA is hard semicrystalline terminal blocks. The copolymers showed glass transition temperature at lower than −40 °C and melting temperature at 130–152 °C. The tensile tests of these copolymers were also performed to evaluate their mechanical properties. The degradation of the copolymers and PMPG by enzymes proteinase K and lipase PS were investigated. Microbial biodegradation in seawater was also performed at 27 °C. The triblock copolymers and PMPG homopolymer were found to show 9–15% biodegradation within 28 days, representing their relatively high biodegradability in seawater. The macromolecular structure of the triblock copolymers of PLA and PMPG can be controlled to tune their mechanical and biodegradation properties, demonstrating their potential use in various applications.

Di- and Triblock Copolymers Based on Polyethylene and Polyisobutene Blocks. Toward New Thermoplastic Elastomers

2013 ◽  
Vol 46 (9) ◽  
pp. 3417-3424 ◽  
Author(s):  
Edgar Espinosa ◽  
Bernadette Charleux ◽  
Franck D’Agosto ◽  
Christophe Boisson ◽  
Ranjan Tripathy ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers

Thermoplastic elastomers of alloocimene and isobutylene triblock copolymers

Polymer ◽  
2015 ◽  
Vol 56 ◽  
pp. 280-283 ◽  
Author(s):  
J.H. Roh ◽  
D. Roy ◽  
W.K. Lee ◽  
A.L. Gergely ◽  
J.E. Puskas ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers

Adhesion of Elastomers, with Special Reference to Triblock Copolymers

1978 ◽  
Vol 51 (2) ◽  
pp. 354-364 ◽  
Author(s):  
A. N. Gent ◽  
G. R. Hamed
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers ◽  
Random Copolymers ◽  
Plastic Yielding ◽  
Dissipation Process ◽  
Substrate Adhesion ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Strength Of Adhesion

Abstract Several physical and chemical factors affect the strength of adhesion (as measured by a peeling method) for elastomers adhering to rigid substrates. These factors include: the thickness of the elastomer layer (and of an adhering backing, if present); the rate of detachment and the test temperature; and the presence of chemical bonds between elastomer and the substrate. Adhesion of thermoplastic elastomers, i.e., SBS triblock copolymers, applied as hot melts, is much stronger than for the corresponding random copolymers, crosslinked in situ. These materials also show higher cohesive (tear) strength. Both effects probably arise from the same cause: an energy-dissipation process which operates at large stresses and prevents brittle fracture. This process is thought to be plastic yielding of the polystyrene domains.

Synthesis, Characterization, Physical and Processing Properties of New TPEs: Star-Blocks Comprising Multiple Polystyrene-b-Polyisobutylene Arms Radiating from a Polydivinylbenzene Core

1998 ◽  
Vol 71 (5) ◽  
pp. 949-957 ◽  
Author(s):  
Siddhartha Asthana ◽  
Istvan Majoros ◽  
Joseph P. Kennedy
Keyword(s):  
Tensile Properties ◽  
Triblock Copolymers ◽  
Thermoplastic Elastomers ◽  
Block Polymers ◽  
High Yields ◽  
Processing Properties

Abstract The synthesis of the title star-block thermoplastic elastomers (TPEs) was accomplished by linking living polystyrene-b-polyisobutylene (PSt-b-PIB⊕) diblocks with divinylbenzene. Linking was fast and high yields of star-block polymers were obtained. The products were characterized by a variety of techniques. The physical and processing properties of the star-blocks have been investigated and they were found to exhibit superior tensile properties and lower melt viscosities to those of similar linear triblock copolymers.

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