Thermoplastic Elastomers

Holden, G.

doi:10.1007/978-1-4615-7823-9_16

Cited by 78 publications

(40 citation statements)

References 6 publications

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“…Thermoplastic poly(ether ester) elastomer (TPEE) [ 1 ], as a member of thermoplastic elastomers (TPE), is widely used in the market [ 2 , 3 , 4 , 5 , 6 ]. The synthesis of TPEE was first reported by Coleman [ 7 ] in 1954, and TPEE was described to be a block copolymer consisting of two separated phases: Crystalline aromatic polyester as a hard segment [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ] and amorphous polyether as a soft segment [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…PBT-based TPEE has been developed, such as poly(butylene terephthalate- co -polyethylene glycol) (PBT- co -PEG) [ 16 , 31 ] and poly(butylene terephthalate- co -polypropylene glycol) (PBT- co -PPG) [ 32 ], revealing varied characteristics depending on different compositions. Poly(butylene terephthalate- co -tetramethylene ether glycol) (PBT- co -PTMEG) copolymer was first commercialized under the trademark “Hytrel” (Du pont, Wilmington, DE, United States) as engineering plastics in 1972 [ 33 , 34 , 35 ], and the morphology [ 17 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ], properties [ 45 , 46 , 47 , 48 , 49 ], interactions between hard segments and soft segments [ 50 , 51 ], and structure of the crystalline [ 36 , 38 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ] and amorphous phase [ 5 , 17 , 49 , 59 ] have been studied extensively. The crystalline regions of PBT- co -PTMEG copolymers are continuous and highly interconnected, dispersing in a continuous amorphous region [ 52 , 60 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Nonisothermal Crystallization Kinetics of Poly(Butylene Terephthalate-co-Tetramethylene Ether Glycol) Copolyesters

2020

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Poly(butylene terephthalate-co-tetramethylene ether glycol) (PBT-co-PTMEG) copolymers with PTMEG ranging from 0 to 40 wt% were synthesized through melt polymerization. The structure and composition were supported by Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (1H NMR). All samples had excellent thermal stability at a Td−5% around 370 °C. Crystallization temperature (Tc) and enthalpy of crystallization (ΔHc) were detected by differential scanning calorimetry (DSC), revealing a decrement from 182.3 to 135.1 °C and 47.0 to 22.1 J g−1, respectively, with the increase in PTMEG concentration from 0 to 40 wt%. Moreover, nonisothermal crystallization was carried out to explore the crystallization behavior of copolymers; the crystallization rate of PBT reduced gradually when PTMEG content increased. Hence, a decrement in the spherulite growth rate was detected in polarizing light microscope (PLM) observation, observing that the PTMEG could enhance the hindrance in the molecular chain to lower the crystallinity of PBT-co-PTMEG copolyester. Moreover, thermal properties and the crystallization rate of PBT-co-PTMEG copolymers can be amended via the regulation of PTMEG contents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Nonisothermal Crystallization Kinetics of Poly(Butylene Terephthalate-co-Tetramethylene Ether Glycol) Copolyesters

2020

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“…Styrene-ethylene-butadiene-styrene (SEBS) is considered a thermoplastic elastomer (TPE); these materials combine the easy processing characteristic of a thermoplastic with the physical properties of a vulcanized rubber [1,2]. SEBS is obtained by the hydrogenation process of styrene-butadiene-styrene (SBS) that breaks the unsaturated bonds of the polybutadiene chain, and the result is a transparent material with a higher resistance to aging that is used in areas such as medical instruments, orthopedic appliances, toys, protective materials, polymer modified bitumen (PMB), and so on [3,4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultraviolet Radiation Exposure Time on Styrene-Ethylene-Butadiene-Styrene (SEBS) Copolymer

2020

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The effect of ultraviolet radiation on styrene-ethylene-butadiene-styrene (SEBS) has been studied at different exposures times in order to obtain a better understanding of the mechanism of ageing. The polymer materials were mechanically tested and then their surfaces were analyzed using a scanning electron microscope (SEM) and atomic force microscopy (AFM). Moreover, the optical analysis of contact angle (OCA) was used to evaluate the surface energy (γ s ) and the yellowing index (YI) and attenuated total reflectance infrared spectroscopy (ATR-FTIR) were used to observe structural and physical changes in aging SEBS. The results obtained for the SEBS, in relation to the duration of exposure, showed superficial changes that cause a decrease in the surface energy (γ s ) and, therefore, a decrease in surface roughness. This led to a reduction in mechanical performance, decreasing the tensile strength by about 50% for exposure times of around 200 hours.

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“…This is similar to Holden's report. 32 Obviously, the chemical composition of the star-shaped SBS copolymers from S2D to S8D is basically identical. The compositions of the PS and PB blocks in the copolymers have been calculated from the peak intensities, and the PS contents are listed in Table I.…”

Section: Structure Of Star Sbsmentioning

confidence: 99%

Molecular weight and arm number of a star‐shaped styrene–butadiene block copolymer synthesized on a pilot‐vessel scale

Zhang

2006

J of Applied Polymer Sci

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To improve the rheological properties and processability of industrial rubbers, star-shaped styrenebutadiene-styrene (SBS) block copolymers were synthesized and characterized in this work. Through the variation of the ratio of divinylbenzene to the diblock anion, a series of SBS samples with three to six arms were prepared. Multi-angle laser light scattering (MALLS) and size exclusion chromatography (SEC) combined with light scattering (LS) were used to determine the weight-average molecular weight (M w ), radius of gyration (hS 2 i 1/2 ), arm number, and chain conformation. The results from MALLS indicated that the M w values of the star-shaped SBS copolymers were 9.0, 13.0, 14.9, and 18.1 Â 10 4 , which corresponded to three, four, five, and six arms, respectively. There was a lot of M w and hS 2 i 1/2 data for the many fractions in the SEC chromatograms of the SBS copolymers in tetrahydrofuran (THF) detected by LS, so the exponent of hS 2 i 1/2 ¼ KM w a was determined to range from 0.59 to 0.30 for the samples having three to six arms. An analysis of the results revealed that the star SBS copolymers existed in a sphere conformation in THF, and their chain density increased with an increase in the arm number. The viscosity of the six-arm SBS copolymer was reduced significantly, compared with that of the SBS samples having three to five arms, when their M w values were similar.

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Thermoplastic Elastomers

Cited by 78 publications

References 6 publications

Synthesis and Nonisothermal Crystallization Kinetics of Poly(Butylene Terephthalate-co-Tetramethylene Ether Glycol) Copolyesters

Synthesis and Nonisothermal Crystallization Kinetics of Poly(Butylene Terephthalate-co-Tetramethylene Ether Glycol) Copolyesters

Influence of Ultraviolet Radiation Exposure Time on Styrene-Ethylene-Butadiene-Styrene (SEBS) Copolymer

Molecular weight and arm number of a star‐shaped styrene–butadiene block copolymer synthesized on a pilot‐vessel scale

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