Synthesis and properties of thermoplastic elastomers based on PTMO and tetra-amide

Krijgsman, J.; Husken, D.; Gaymans, R.J.

doi:10.1016/j.polymer.2003.09.043

Cited by 72 publications

(192 citation statements)

References 28 publications

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“…Normally, the fracture stress decreases with increasing temperature whereas the fracture strain increases [5][6][7][8][9]25]. Moreover, the fracture stress is often less dependent on temperature than the yield stress.…”

Section: Fracture Behaviormentioning

confidence: 99%

Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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The tensile properties of segmented block copolymers with mono-disperse hard segments were studied with respect to the hard segment content (16-44 wt.%) and the temperature (20-110°C). The copolymers were comprised of poly(tetramethylene oxide) segments with the molecular weights of 650-2,900 Da and of mono-disperse bisester-tetra-amide segments (T6A6T) based on adipic acid (A), terephthalic acid (T) and hexamethylene diamine (6). An increasing content of T6A6T gave rise to an increased modulus, yield stress and fracture stress. The modulus could be modeled by a composite model. Moreover, a strain-softening was observed well below the yield stress, due to the shearing of the T6A6T crystallites. At strains [200%, a strain-hardening of the PTMO segments took place and this even for PTMO segments that were amorphous in the isotropic state. The strain hardening increased the tensile properties. An increase in temperature had little effect on the modulus of the copolymers, but was found to lower the yield and fracture stresses. At temperatures above the melting temperature of the oriented PTMO, no strain-hardening took place. The yield stress as a function of temperature could be described by the Eyring relationship, but a modulus-yield stress relationship could not be established.

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Section: Fracture Behaviormentioning

confidence: 99%

Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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“…By using terephthalic extender units, the segment length can be increased without demixing taking place. [26][27][28][29] Also, the presence of terephthalic extender units in the chain leads to a suppression of the PEO crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of hydrophilic segmented block copolymers based on poly(ethylene oxide)‐ran‐poly(propylene oxide)

IJzer

Arun

Reijerkerk

et al. 2010

J of Applied Polymer Sci

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The present article discusses the synthesis and various properties of segmented block copolymers with random copolymer segments of poly(ethylene oxide) and poly(propylene oxide) (PEO-r-PPO) together with monodisperse amide segments. The PEO-r-PPO contained 25 wt % PPO units and the segment presented a molecular weight of 2500 g/mol. The synthesized copolymers were analyzed by differential scanning calorimetry, Fourier transform infra-red spectroscopy, atomic force microscopy and dynamic mechanical thermal analysis. In addition, the hydrophilicity and the contact angles (CAs) were studied. The PEO-r-PPO segments displayed a single low glass transition temperature, as well as a low PEO crystallinity and melting temperature, which gave enhanced low-temperature properties of the copolymer. The water absorption values remained high. In comparison to mixtures of PEO/PPO segments, the random dispersion of PPO units in the PEO segments was more effective in reducing the PEO crystallinity and melting temperature, without affecting the hydrophilicity. Increasing the polyether segment length with terephthalic groups from 2500 to 10,000 g/mol increased the hydrophilicity and the room temperature elasticity. Furthermore, the CAs were found to be low [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] and changed with the crosslink density.

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“…1,2 Typically, thermoplastic elastomers are block copolymers consisting of two or more chemically-distinct blocks that are covalently linked. Due to their chemical disparity, the different blocks tend to phase-separate into microdomains to minimize the overall free energy.…”

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confidence: 99%

“…3,4 Some of the common thermoplastic elastomers are segmented polyurethane, poly(styrene-b-butylene-b-styrene), poly-(styrene-b-isoprene-b-styrene), and poly(styrene-bisoprene). [1][2][3][4][5] For examples, poly(styrene-b-isopreneb-styrene) and poly(styrene-b-isoprene) are generally used for pressure sensitive applications, where durability and elasticity are important. 4,5 In recent years, electrostatic spinning or electrospinning has been viewed as a simple and versatile method for fabricating ultrafine fibers with diameters in the nanometer to sub-micrometer range.…”

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confidence: 99%

Electrospinning of Styrene-Isoprene Copolymeric Thermoplastic Elastomers

Chuangchote

Sirivat

Supaphol

2006

Polym J

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ABSTRACT:In the present contribution, electrospinning of two chemically distinct thermoplastic elastomers based on block copolymers of styrene and isoprene [i.e., multi-armed poly(styrene-b-isoprene) (PS-PI) and linear poly-(styrene-b-isoprene-b-styrene) (PS-PI-PS)] was reported for the first time. Either 1,2-dichloroethane or chloroform was used as the solvent. The effects of solution concentration, solvent, applied electrical potential, chemical structure of the thermoplastic elastomers, and solution feed rate on morphological appearance and/or size of the as-electrospun products were investigated mainly by means of scanning electron microscopy (SEM). The electrospinnability of the polymer solutions was found to increase with increasing solution concentration. The size of the as-spun products from PS-PI solutions in 1,2-dichloroethane was consistently smaller than that of the products from the solutions in chloroform. The increase in the applied electrical potential caused the size of the as-spun products from both types of the polymer solutions to decrease monotonously or decrease with initial increase in the applied potential, reach a minimum at an intermediate value, and increase with further increasing applied potential. Despite the difference in the chemical structure of the two elastomers, the viscosity of their solutions in 1,2-dichloroethane was essentially similar, but the size of the as-spun products from PS-PI solutions was consistently larger than that of the products from PS-PI-PS solutions. [doi:10.1295/polymj.PJ2005234] KEY WORDS Electrospinning / Thermoplastic Elastomer / Block Copolymer / Thermoplastic elastomers are unique class of polymers which have physical and mechanical properties like vulcanized rubbers but can be processed by conventional thermoplastic processes.

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Synthesis and properties of thermoplastic elastomers based on PTMO and tetra-amide

Cited by 72 publications

References 28 publications

Tensile properties of segmented block copolymers with monodisperse hard segments

Tensile properties of segmented block copolymers with monodisperse hard segments

Synthesis and properties of hydrophilic segmented block copolymers based on poly(ethylene oxide)‐ran‐poly(propylene oxide)

Electrospinning of Styrene-Isoprene Copolymeric Thermoplastic Elastomers

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