Xia Housheng, Jiang Zhen, Tang Jiaxiang, Tang Jiao, Zhou Jianping, Yang Zize, Zheng Rongbo, Niu Junfeng
School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Zhejiang Xianghe Railway Fastener Research Institute, Zhejiang Tiantai Xianghe Industrial Co., Ltd., Taizhou 317200, China.
Polymers (Basel). 2024 Jun 5;16(11):1598. doi: 10.3390/polym16111598.
Plant-derived PA10T is regarded as one of the most promising semi-aromatic polyamides; however, shortcomings, including low dimensional accuracy, high moisture absorption, and relatively high dielectric constant and loss, have impeded its extensive utilization. Polymer blending is a versatile and cost-effective method to fabricate new polymeric materials with excellent comprehensive performance. In this study, various ratios of PA10T/PPO blends were fabricated via melt blending with the addition of a SEBS-g-MAH compatibilizer. Molau test and scanning electron microscopy (SEM) were employed to study the influence of SEBS-g-MAH on the compatibility of PA10T and PPO. These studies indicated that SEBS-g-MAH effectively refines the domain size of the dispersed PPO phase and improves the dispersion stability of PPO particles within a hexafluoroisopropanol solvent. This result was attributed to the in situ formation of the SEBS-g-PA10T copolymer, which serves as a compatibilizer. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results showed that the melting-crystallization behavior and thermal stability of blends closely resembled that of pure PA10T. Dynamic mechanical analysis (DMA) revealed that as the PPO content increased, there was a decrease in the glass transition temperature and storage modulus of PA10T. The water absorption rate, injection molding shrinkage, dielectric properties, and mechanical strength of blends were also systematically investigated. As the PPO content increased from 10% to 40%, the dielectric loss at 2.5 GHz decreased significantly from 0.00866 to 0.00572, while the notched Izod impact strength increased from 7.9 kJ/m to 13.7 kJ/m.
植物源PA10T被认为是最有前途的半芳香族聚酰胺之一；然而，其存在的缺点，包括尺寸精度低、吸湿性高以及相对较高的介电常数和损耗，阻碍了其广泛应用。聚合物共混是一种通用且经济高效的方法，可用于制备具有优异综合性能的新型聚合物材料。在本研究中，通过添加SEBS-g-MAH增容剂，经熔融共混制备了不同比例的PA10T/PPO共混物。采用莫劳试验和扫描电子显微镜（SEM）研究了SEBS-g-MAH对PA10T和PPO相容性的影响。这些研究表明，SEBS-g-MAH有效地细化了分散的PPO相的畴尺寸，并提高了PPO颗粒在六氟异丙醇溶剂中的分散稳定性。这一结果归因于作为增容剂的SEBS-g-PA10T共聚物的原位形成。差示扫描量热法（DSC）和热重分析（TGA）结果表明，共混物的熔融结晶行为和热稳定性与纯PA10T非常相似。动态力学分析（DMA）表明，随着PPO含量的增加，PA10T的玻璃化转变温度和储能模量降低。还系统研究了共混物的吸水率、注塑成型收缩率、介电性能和机械强度。随着PPO含量从10%增加到40%，2.5 GHz下的介电损耗从0.00866显著降低至0.00572，而缺口悬臂梁冲击强度从7.9 kJ/m增加到13.7 kJ/m。
