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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Extenders on Thermal and Elastic Properties of Segmented Copolyetheresteraramides
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Influence of Extenders on Thermal and Elastic Properties of Segmented Copolyetheresteraramides

机译：补充剂对嵌段共聚醚酯酰胺的热弹性性能的影响

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摘要

Copolyetheresteramides with bisesterdiamide units of a uniform length were synthesized in the current study, and the dynamic mechanical and elastic prop- erties of the copolymers produced were studied. Diols are used to extend the length of uniform bisesterdiamide hard segments. Extenders have a twofold effect: increasing the lamellar thickness of the bisesterdiamide crystals and having the ability to inde- pendently adjust the ratio between the hard and soft segment. It was found that polymers containing 1,12-dodecanediol as an extender possess a multiphase structure. Two glass-transition temperatures (T_g) were observed along with a very broad melting transition. The T_g at about -70°C was found to originate from the amorphous polyether phase, the T_g at about 140-175°C was attributed to a glassy aramid-1,12-dodecanediol phase. The broad melting transition was caused by the presence of the wide variety of lamellar sizes. This multiphase morphology is probably results from the liquid-liquid demixing of an aramid-polyether and from the aramid-extender phase. Polymers containing 1, 12-dodecanediol and 13 wt % aramid had an improved elasticity compared to similar polymers without an extender. It is thought this is the result of large isolated, spherically shaped domains become less plastically deformed than the crystalline network of thin lamellae.
机译：在本研究中，合成了具有均匀长度的双酯二酰胺单元的共聚醚酯酰胺，并研究了所生产共聚物的动态力学和弹性性质。二醇用于延长均匀的双酯二酰胺硬链段的长度。补充剂具有双重作用：增加双酯二酰胺晶体的层状厚度，并具有独立调节硬链段和软链段之比的能力。发现含有1，12-十二烷二醇作为增量剂的聚合物具有多相结构。观察到两个玻璃化转变温度（T_g）以及非常宽的熔融转变。发现约-70℃下的T_g源自无定形聚醚相，约140-175℃下的T_g归因于玻璃状芳族聚酰胺-1，12-十二烷二醇相。广泛的熔融转变是由于存在各种层状尺寸而引起的。这种多相形态可能是由于芳族聚酰胺-聚醚的液-液混合以及芳族聚酰胺-增量剂相的结果。与没有增量剂的类似聚合物相比，含有1、12-十二烷二醇和13wt％芳族聚酰胺的聚合物具有改善的弹性。认为这是由于较大的孤立球形区域变得比薄薄片的晶体网络塑性变形少。

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