SEEPS基热塑性磁流变弹性体复合材料的制备、结构与性能

Preparation, structure and properties of SEEPS-based thermoplastic magnetorheological elastomer composites

选用性能优良的聚(苯乙烯-b-乙烯-b-乙烯-丙烯-b-苯乙烯)(SEEPS)热塑性弹性体代替传统橡胶为基体、软磁性羰基铁粉为磁性填料,采用熔融共混技术制备得到弹性好、磁流变效应高的新型各向同性和各向异性SEEPS基热塑性磁流变弹性体(MRE)复合材料。详细地介绍了两类材料的制备方法,系统地研究了基体分子量、羰基铁含量和外加磁场强度等因素对材料结构和性能的影响。羰基铁粉在各向同性MRE复合材料中呈现无规均匀分散,在各向异性MRE复合材料中呈现明显链状定向有序结构。高分子量基体吸油性优于低分子量基体,柔软度更高,加工性能更好,强度和韧性受高填充羰基铁的影响小,磁流变效应也更高。各向异性MRE比各向同性MRE具有更高的储能模量和磁流变效应。

Novel isotropic and anisotropic SEEPS-based thermoplastic magnetorheological elastomers （MRE） composites possessing good elasticity and high magnetorheological effect were prepared by melting blending technique with the poly（styrene-b-ethylene-ethylene-propylene-b-styrene） （SEEPS） as matrix substituting traditional rubber and carbonyl iron powders as magnetic fillers. In this paper, the preparation method of SEEPS-based MRE composites was described in detail, and effects of matrix molecular weight, carbonyl iron concentration and external magnetic field intensity on the structure and properties of the SEEPS based MRE composites were investigated systemically. Carbonyl iron powders exhibit random and uniform dispersion in isotropic MRE composites, and obvious oriented and ordered chain-like structures in anisotropic MRE composites. Compared with lower molecular weight matrix, the higher molecular weight matrix possesses better oil adsorbility, softness and processibility, higher magnetorheological effect, and less influence on the strength and toughness by higher filling of carbonyl iron. Isotropic MRE composite shows higher storage modulus and magnetorheological effect than the anisotropic MRE composite does.