Structure of polyamide 6/poly(ethylene terephthalate) blends under high cooling rate and shear stress and their moisture-sensitive properties
Structure of polyamide 6/poly(ethylene terephthalate) blends under high cooling rate and shear stress and their moisture-sensitive properties
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高冷却速率和剪切应力下聚酰胺6/聚对苯二甲酸乙二醇酯共混物的结构及其湿敏性能
DOI：
10.1016/j.polymer.2020.122817
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发表时间：
2020-08-26
期刊：
影响因子：
4.6
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Ma, Guo-Qi;Yang, Hao;Li, Zhong-Ming
通过与聚对苯二甲酸乙二酯（PET）共混，实现了低湿敏性聚酰胺6（PA 6）的共混，并研究了在高冷却速率和剪切应力下形成的结晶结构和形态。随着PET含量的增加，最大含水量从9.7%显著降低到5.6%，扩散系数从1.2 × 10（-6）mm（2）/s变化到5.2 × 10（-7）mm（2）/s。随着PET含量的增加，介电常数从12.3降低到6.2（@10（3）Hz），介电损耗从0.25降低到0.13（@10（3）Hz）。结构表征证实了PA 6和PET之间的氢键相互作用在降低PA 6的湿敏性中起主要作用，以及PA 6的多晶型的演变，即高剪切应力促进α-晶型的形成，而高冷却速率促进γ-晶型的产生。
Polyamide 6 (PA6) with low moisture-sensitivity is realized by blending with poly(ethylene terephthalate) (PET), the crystal structure and morphology formed under high cooling rate and shear stress are also investigated. A pronounced reduction in the maximum water content from 9.7 to 5.6 wt% accompanying the variation of the diffusion coefficient from 1.2 x 10(-6) to 5.2 x 10(-7) mm(2)/s with the increasing of PET content is achieved. The dielectric constant decreases from 12.3 to 6.2 (@10(3) Hz) and the dielectric loss decreases from 0.25 to 0.13 (@10(3) Hz) with the increasing of PET content. The structural characterization confirms that the hydrogen-bonding interactions between PA6 and PET play a major role in the reduction of moisture-sensitivity of PA6 as well as that the evolution of the polymorphism of PA6 that the high shear stress facilitates the formation of alpha-form while the high cooling rate promotes the generation of gamma-form.