摘要
为改善聚酰胺弹性体(TPA)的力学性能与摩擦学性能,采用自制氨基超支化聚硅氧烷(HBPSi)对钛酸钾晶须(PTW)进行表面改性,制得PTW@HBPSi复合增强相。通过熔融共混法制备了一系列不同质量分数的TPA/PTW@HBPSi复合材料,并系统研究了其形貌结构、热稳定性、拉伸性能、动态热机械性能及摩擦学性能。实验结果表明,PTW@HBPSi在TPA基体中均匀分散,并且与TPA基体表现出良好的界面结合特性。尽管PTW@HBPSi的引入会使复合材料热稳定性略有下降,但其对力学性能的提升显著。当PTW@HBPSi质量分数为3%时,复合材料综合力学性能最优,拉伸强度和断裂伸长率分别达49.9 MPa和286.0%,较纯TPA分别提高了16%和22.9%。动态热机械性能分析显示,随着PTW@HBPSi含量增加,复合材料的储能模量和损耗模量逐步提升,损耗因子略有波动,但复合材料表现出更宽的阻尼温域。摩擦学性能方面,含有质量分数5%PTW@HBPSi的TPA复合材料表现最佳,摩擦因数降至0.297,磨损率低至7.9×10^(-5)mm^(3)/(N·m)。综上,PTW@HBPSi的加入显著提升了TPA复合材料的综合性能,为其在工程摩擦领域的应用提供了新思路。
To enhance the mechanical and tribological properties of polyamide elastomer(TPA),self-synthesized amino-terminated hyperbranched polysiloxane(HBPSi)was employed to modify the surface of potassium titanate whiskers(PTW),yielding HBPSi-modified PTW(PTW@HBPSi).A series of TPA/PTW@HBPSi composites with different mass fractions of PTW@HBPSi was then fabricated via melt compounding.The morphology,thermal stability,tensile properties,dynamic mechanical behavior,and tribological performance of the TPA/PTW@HBPSi composites were systematically investigated.The results indicate that PTW@HBPSi achieves uniform dispersion in the TPA matrix and forms good interfacial bonding with the matrix.Although the incorporation of PTW@HBPSi leads to a slight decrease in thermal stability of the TPA/PTW@HBPSi composites,it significantly improves their mechanical properties.With the addition of 3 wt%PTW@HBPSi,the TPA/PTW@HBPSi composite exhibits the optimal tensile properties,with a maximum tensile strength of 49.9 MPa and elongation at break of 286.0%,corresponding to increases of 16%and 22.9%over pure TPA,respectively.The dynamic mechanical analysis shows that both the storage modulus and the loss modulus of the composites gradually increase with rising PTW@HBPSi content,while the loss factor fluctuates slightly,indicating a broader damping temperature range.The tribological properties of TPA composites with a mass fraction of 5%PTW@HBPSi were the best,with the coefficient of friction reduced to 0.297 and the wear rate as low as 7.9×10^(-5)mm^(3)/(N·m).In summary,the introduction of PTW@HBPSi effectively enhances the comprehensive properties of TPA composites,suggesting its considerable potential for practical applications in engineering friction systems.
作者
吴承恳
唐梓健
郭心怡
吴昊
伍巍
WU Chengken;TANG Zijian;GUO Xinyi;WU Hao;WU Wei(The 23rd Research Institute of China Electronics Technology Group Corporation,Shanghai 201900,China;Engineering Center for Superlubricity,Jihua Laboratory,Foshan 528200,China;Guangdong Key Laboratory of Materials and Equipment in Harsh Marine Environment,School of Ocean Engineering,Guangzhou Maritime University,Guangzhou 510725,China)
出处
《工程塑料应用》
北大核心
2025年第11期9-16,共8页
Engineering Plastics Application
基金
再制造技术全国重点实验室基金项目(61420052023KJW04)。
关键词
超支化聚硅氧烷
钛酸钾晶须
聚酰胺弹性体
摩擦学性能
力学性能
hyperbranched polysiloxane
potassium titanate whisker
polyamide elastomer
tribological performance
mechanical property
