热塑性聚酰胺弹性体的扩链共混改性及发泡性能研究,ACS Omega

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热塑性聚酰胺弹性体的扩链共混改性及发泡性能研究
ACS Omega ( IF 3.7 ) Pub Date : 2023-03-06 , DOI: 10.1021/acsomega.2c06285
Yuyin Zhao ₁ , Jiaxin Zheng ₁ , Pei Guo ₁ , Congxiao Wang ₁ , Menghao Guo ₁ , Chunling Xin _{1,

2} , Yadong He _{1,

2}

Affiliation

为提高热塑性聚酰胺弹性体的熔融发泡性能，降低发泡材料的收缩率，本文采用酸酐扩链剂SMA（苯乙烯马来酸酐共聚物）原位反应共混热塑性聚酰胺弹性体（TPAE）和聚酰胺6 (聚酰胺6)。_{通过旋转流变仪和差示扫描量热仪表征了改性样品的流变学和结晶性能，并采用CO 2}熔体间歇发泡实验作为发泡剂进行。结果表明，随着PA6含量的增加，改性TPAE的熔融焓降低，这意味着体系硬相的结晶度降低。尽管如此，结晶度的降低有利于提高气体的渗透性，降低泡孔内外压差对泡沫收缩的影响。此外，随着 PA6 含量的增加形成的微交联结构提高了改性 TPAE 的储能模量，从而可以加速应变恢复。所有改性 TPAE 样品的发泡温度区和恢复性能均得到显着改善。整体收缩率降至10%以下，

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Study on Chain Extension Blending Modification and Foaming Behavior of Thermoplastic Polyamide Elastomer

In order to improve the melt foaming properties of thermoplastic polyamide elastomers and reduce the shrinkage rate of foamed materials, acid anhydride chain extenders SMA (styrene maleic anhydride copolymer) are used in this paper to in situ reactive blending thermoplastic polyamide elastomers (TPAE) and polyamide 6 (PA6). The rheological and crystalline properties of the modified samples were characterized by a rotational rheometer and differential scanning calorimeter, and the melt batch foaming experiment with CO₂ as the foaming agent was carried out. The results showed that the melting enthalpy of modified TPAE reduced with the addition of content of PA6, which implied that the crystallinity of the hard phase of the system was depressed. Nevertheless, the reduction of crystallinity was beneficial to improve the penetration of gas and reduce the effect of the pressure difference inside and outside the cell on foam shrinkage. Additionally, the microcross-linked structure formed with the increase of PA6 content enhanced the storage modulus of modified TPAE, which could accelerate recovery of strain. The foaming temperature zone and recovery performance of all modified TPAE samples were significantly improved. The overall shrinkage rate was reduced to less than 10%, the maximum expansion ratio could reach 11–13 times with a more complete and uniform cell structure, and the resilience was improved by about 12%.

更新日期：2023-03-06

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