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.

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.

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

Perfluoropolyether/poly(ethylene glycol) triblock copolymers with controllable self-assembly behaviour for highly efficient anti-bacterial materials

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64170-64179 ◽  
Author(s):  
Jing Song ◽  
Qun Ye ◽  
Wang Ting Lee ◽  
Xiaobai Wang ◽  
Tao He ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Click Reaction ◽  
Triblock Copolymers ◽  
Poly Ethylene Glycol ◽  
Highly Efficient ◽  
Poly Ethylene ◽  
High Yields

A series of perfluoropolyether/poly(ethylene glycol) (PFPE/PEG) triblock copolymers PEG/PFPE/PEG (P1–P3) and PFPE/PEG/PFPE (P4–P5) were prepared via thiol–ene click reaction in high yields.

The Effect of a Copolymer of Ethylene and Vinyl Acetate on the Formation of the Structure and the Processing Properties of Olefinic Thermoplastic Elastomers

2017 ◽  
Vol 44 (6) ◽  
pp. 15-20 ◽  
Author(s):  
R.I. Ableev ◽  
I.V. Baranets ◽  
S.K. Kurlyand ◽  
A.N. Zabelina ◽  
A.S. Ramsh ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Volume Fraction ◽  
Morphological Characteristics ◽  
Optical Microscope ◽  
Thermoplastic Elastomers ◽  
Strength Properties ◽  
Dielectric Relaxation Spectroscopy ◽  
Cooling Chamber ◽  
Rubber Component ◽  
Processing Properties

Optical microscopy and dielectric relaxation spectroscopy (DRS) were used to study the structure of dynamically vulcanised mixes based on polypropylene, ethylenepropylenediene rubber, and copolymers of ethylene and vinyl acetate (Levapren 400, 600, 700). For the microscopic investigations, we used a complex consisting of a Leica DM-2500 optical microscope, a DFC 420C cooling chamber, and a special computer desk. DRS data were obtained on a BDS 89 instrument (NovoControl) at temperatures ranging from −150 to +100°C at a heating rate of 2°C/min and a frequency of 110 Hz. The influence of the content of Levapren and the proportion of vinyl acetate in its composition on the morphology and processing properties of olefinic thermoplastic vulcanisates (TPVs) was investigated. The combination of the discovered changes in the fine structure and DRS data indicate the preferential interaction of Levapren with the rubber component. The evolution of the morphology of the TPVs with increase in the volume fraction of vinyl acetate is not monotonic, which is consistent with the nature of change in the physicomechanical properties of the TPVs. Combined analysis of the morphological characteristics and processing properties of TPVs showed that, to achieve high values of the deformation and strength properties, a uniform distribution and high polydispersity of the ingredients are necessary. Increase in the elastic properties of the material is ensured by modification of the polypropylene phase to form fibrillar structures, while the flow of TPEs that is necessary for processing is facilitated by modification of the rubber phase.

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

Synthesis of Radial Thermoplastic Elastomers

1976 ◽  
Vol 49 (5) ◽  
pp. 1305-1310 ◽  
Author(s):  
H. L. Hsieh
Keyword(s):  
Coupling Reaction ◽  
Shear Resistance ◽  
Thermoplastic Elastomers ◽  
Lower Solution ◽  
Commercial Production ◽  
Linear Polymers ◽  
Block Sequence ◽  
Block Polymers ◽  
Molecular Weights ◽  
Number Of Branches

Abstract The combination of anionic polymerization techniques and a subsequent coupling reaction created a versatile process for producing block polymers of not only controlled block length and block sequence but also with a controlled number of branches. This process has been successfully used in commercial production since 1967. Radial styrene-diene block polymers have properties significantly different from linear polymers of the same molecular weight, showing lower melt viscosities as well as lower solution viscosities. This feature is significant in adhesive applications because it allows the use of polymers of higher molecular weights with a corresponding improvement in shear resistance.

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