PI短纤维对EPDM绝热层平行压延方向断裂伸长率的影响  

Optical effects of PI short fibers on elongation of EPDM insulation in parallel rolling direction

作　　者：张琰 何永祝[1] 胡建江[1] 王明超[1] 周俊 陈雯[1] 任雯君 ZHANG Yan;HE Yongzhu;HU Jianjiang;WANG Mingchao;ZHOU Jun;CHEN Wen;REN Wenjun(Hubei Institute of Aerospace Chemical Technology,Xiangyang 441003,China)

机构地区：[1]湖北航天化学技术研究所

出　　处：《固体火箭技术》2019年第6期779-785,共7页Journal of Solid Rocket Technology

基　　金：国家自然科学基金委员会-中国航天科技集团有限公司航天先进制造技术研究联合基金(U1837601)

摘　　要：研究了聚酰亚胺短纤维(PI)的断裂强度和长度对三元乙丙绝热层(EPDM)平行压延方向上拉伸力学行为的影响,探讨了PI短纤维在绝热层中的分散性对绝热层断裂伸长率的影响,并提出了在Cox剪滞理论基础上的机理解释,使用扫描电子显微镜(SEM)表征了混炼前后的PI短纤维表面形貌与不同强度的PI纤维填充绝热层的拉伸断面形貌。结果表明,随着PI短纤维强度的提高,绝热层伸长率呈下降趋势且PI纤维的分散不均使得绝热层伸长率波动较大;当PI短纤维长度较短时,纤维易被剪切分散,绝热层伸长率较稳定;表面形貌结构规整的PI短纤维在绝热层混炼时高速机械剪切力下不易受损伤;在绝热层的拉伸断面上不同强度的PI短纤维表面均未附着有胶料,与绝热层基体的界面粘合强度均较低。The paper deals with the effects of the breaking strength and fiber length of PI short fiber on the mechanical behavior of EPDM insulation.The effect of the dispersion of PI short fibers on elongation at break of the insulation composites has been investigated,where the Cox shear lag theory has been used as a basic foundation.The surface morphology of the PI short fibers beforEand after mixing,and the morphology of tensile fracture surfaces of the insulation have been characterized by SEM.The results show that the elongation of the insulation decreases with the strength increase of PI short fiber,and the large fluctuation of the elongation values obtained in the tests was due to the uneven dispersion of PI fibers in the insulation composites.Even the uniform dispersion of PI fibers in the insulation composites was achieved with lower PI fiber length,which resulted in consistent elongation.PI short fibers with regular shapes are not easily damaged after mixing under the high-speed mechanical shearing force.On the tensile fracture surfaces of the insulation,no rubber was adhered to the surfaces of PI short fibers of different strengths,and hence the interfacial adhesion strengths became low.

关 键 词：EPDM绝热层 PI短纤维 断裂伸长率 

分 类 号：V255[一般工业技术—材料科学与工程]