Solid state structure–property behavior of semicrystalline poly(ether-block-amide) PEBAX® thermoplastic elastomers

Sheth, Jignesh P.; Xu, Jiannong; Wilkes, Garth L.

doi:10.1016/s0032-3861(02)00798-x

Cited by 206 publications

(257 citation statements)

References 38 publications

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“…This implies that plastic deformation had taken place well before the yield strain (at 25-66% strain). Segmented block copolymers often display significant strain-softening believed to be due to the break-up of the long crystalline ribbons [4,[10][11][12][13]. The yield strain increased with increasing PTMO length and thus also with decreasing T6A6T content (Table 1 and Fig.…”

Section: Dmtamentioning

confidence: 99%

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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: Dmtamentioning

confidence: 99%

“…The hard segment (HS) crystallites have a nano-ribbonlike structure with a high aspect ratio [10][11][12][13][14], and these nano-ribbons reinforce the soft phase [3,4,15]. Upon stretching of such a copolymer, both the soft and the hard phases are deformed, and for a high enough strain, yielding of the hard phase occurs [13,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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“…Its molar composition is 24.8% PTMG, 73.0% PA12 and 2.2% adipic acid as a linkage [42]. Three kinds of clay were used: an organically modified montmorillonite (Cloisite 30B, Southern Clay Products, USA) further referred to as OMMT, a purified one (Cloisite Na + , Southern Clay Products, USA), referred to as NaMMT and a raw one referred to as RawMMT (Süd Chemie, Germany).…”

Section: Experimental 21 Materialsmentioning

confidence: 99%

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Touchaleaume¹,

Soulestin²,

Sclavons³

et al. 2011

Express Polym. Lett.

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Abstract. Polyether-block-amide (PEBA) /clay nanocomposites were prepared water-assisted by twin-screw extrusion. Both organomodified and pristine (i.e. purified but non-modified) montmorillonite clays were used. A high-pressure differential scanning calorimetry analysis carried out in the processing conditions demonstrated that PEBA/water blend exhibits some miscibility and that amide blocks and water behave as a single phase. In addition to a significant decrease of the melting temperature, water injected into the melt plays a key role among the filler dispersion and prevents the matrix from degradation during melt-extrusion. This process enables the compounding of pristine clay-based nanocomposites whose dispersion state is high enough for the resulting mechanical performances in tension to be at least equivalent to what is reached with organomodified clay. Effects of the nanofiller dispersion onto the macromolecules' mobility are detailed and fracture mechanisms are identified for the various structures.

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“…열 가소성 탄성체는 올레핀계 TPE 및 올레핀계 TPV(thermoplastic vulcanizate), 스티렌계 TPE, 우레탄계 TPE(TPU), 불 소계 TPE, 폴리에스테르계 TPE, PVC계 TPE, polyamide계 TPE 등으로 다양하게 세분화되어 개발되었다. [1][2][3][4][5][6][7][8] 특히 polyamide(PA)계 TPE는 결정성의 PA가 hard segment 를 이루고 polyether polyol로 soft segment를 구성하는 블록 공중합체로 이 구성성분을 적당히 조절함으로써 다양한 특성 을 가지는 열가소성 탄성체를 제조할 수 있다. 특히 hard segment인 PA가 TPE의 열적, 기계적 성질에 중요한 영향을 준다.…”

Section: 서 론unclassified

Synthesis and Characterization of Thermoplastic Elastomer Poly(ether-b-amide) Containing Aromatic Moiety

Lee¹,

Kim²

2014

Polymer Korea

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초록: 방향족 구조를 포함하고 분자량이 조절된 polyamide(PA) 올리고머를 4-aminobenzoic acid와 12-aminododecanoic acid의 축합반응으로 합성하였다. 이 올리고머를 여러 분자량의 polytetramethylene glycol(PTMG)과 축합하여 PA를 hard segment로 하고 PTMG를 soft segment로 하는 열가소성 탄성체로서 poly(ether-b-amide)(PEBA)를 제조하였다. 합성된 PEBA의 구조는 FTIR과 1 H NMR로 확인하였으며 DSC와 UTM을 사용하여 hard segment의 구조변화에 따 른 열적특성과 기계적 성질의 변화를 비교해 본 결과 방향족 구조를 3 0%까지 포함할 때 결정성의 변화 없이 PEBA들의 용융온도는 높아졌고 초기 modulus와 strength는 더 크게 나타났다.Abstract: Polyamide (PA) oligomers, which are the hard segment of poly(ether-block-amide) (PEBA), presenting thermoplastic and high performance elastomeric properties were prepared by polycondensation between 4-aminobenzoic acid and 12-aminododecanoic acid. Subsequently PEBAs were obtained by addition polymerization of the PA oligomers and various molecular weights of poly(tetramethylene glycol) (PTMG). The structure of the final PEBA was identified by using FTIR and 1 H NMR and the thermal properties depending on changes in the structure of hard segment were collected by using DSC and UTM analysis. As the results, the melt temperature (T m ), the initial modulus, and the maximum strength of PEBAs increased with an increase in aromatic moiety up to 30% without reducing crystallinity.Keywords: oligomer, polyamide 12, ω-amino carboxylic acid, poly (ether-b-amide) (C-H aromatic bending)가 방향족 단량체 비율이 커질수록 흡 수가 증가되는 것으로 확인되었다. 그리고 Figure 5는 oPA30 (N-H stretching), 2258 cm -1 (N=C=O stretching), 1719 cm -1 (C=O ester bending) 피크 가 존재하는 것으로 확인됨에 따라 합성이 성공적으로 이루 어졌다고 판단하였다.PEBA의 구조 확인. Figure 7은 PEBA의 FTIR spectrum 이다. Hard segment인 PA의 특성 피크인 3307 cm -1 (N-H stretching), 1645 cm -1 (C=O ester bending)가 나타나며 soft segment인 polyether의 특성 피크인 1119 cm -1 (C-O ether bending)가 존재하는 것으로 확인됨에 따라 합성이 성공적으 로 이루어졌다고 여겨진다.oPA의 평균분자량 확인. Figure 8은 방향족 구조인 4-aminobenzoic acid 함량변화에 따른 PA12 올리고머의 DSC thermogram이 다. Table 3을 보면 PA에 방향족 구조를 주는 단량체를 30% 정도까지 도입한 경우 분자사슬이 더욱 단단해진 탓에 T m 과 ∆H가 약간 증가하였다. 하지만, 50 mol% 이상 함유되었을 경 우 오히려 T m 과 ∆H이 떨어졌다. 그 이유는 많은 양이 방향 족 구조가 도입됨으로써 오히려 아미드기에 의한 수소결합을 방해하여 결정성을 떨어뜨린 결과라고 생각된다. 한편, Figure 9는 방향족 구조인 4-aminobenzoic acid의 함량을 변화시켜 Figure 5.

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Solid state structure–property behavior of semicrystalline poly(ether-block-amide) PEBAX® thermoplastic elastomers

Cited by 206 publications

References 38 publications

Tensile properties of segmented block copolymers with monodisperse hard segments

Tensile properties of segmented block copolymers with monodisperse hard segments

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Synthesis and Characterization of Thermoplastic Elastomer Poly(ether-b-amide) Containing Aromatic Moiety

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