PE/OC纳米复合材料的结晶性能与流变性能

Crystallization and rheological properties of PE/OC nano-composites

以聚乙烯(PE)为基体,通过熔融插层法将有机黏土(OC)加入到PE基体中,制备了PE/OC纳米复合材料,并对复合材料的微观结构、结晶性能、流变性能以及力学性能进行表征测试。结果表明:w(OC)为3%时,PE/OC纳米复合材料形成了部分剥离型结构,复合材料的结晶度最大,且拉伸强度最大,达27.6 MPa,但随着OC含量进一步增加,复合材料转变为插层型结构,结晶度和拉伸强度下降。PE/OC纳米复合材料的流变性能表明,w(OC)大于5%时,达到了“渗流阈值”,随着频率的提高,PE/OC纳米复合材料的复数黏度下降,“剪切变稀”现象更加明显,储能模量和损耗模量呈现上升趋势;w(OC)为3%的PE/OC纳米复合材料的各项性能较纯PE有不同程度的提升,极大扩展了PE的使用范围。

Polyethylene(PE)/organic clay(OC)nanocomposites were prepared by adding OC into PE matrix via melting intercalation.The microstructure,crystallization,rheological properties and mechanical properties of the composites were characterized.The results show that partially exfoliated structure is formed in PE/OC nanocomposites when the mass fraction of OC is 3%,both the crystallinity and tensile strength of the composites are the maximum,the latter reaches 27.6 MPa.However,with the mass fraction of OC further increasing,the intercalated structure dominates the composites whose crystallinity and tensile strength decrease.The rheological properties of PE/OC nanocomposites show that the"seepage threshold"is achieved when the mass fraction of OC is larger than 5%.The complex viscosity of PE/OC nanocomposites decreases with the increase of frequency,the"shear thinning"became more obvious,and whose storage modulus and loss modulus rise.The properties of PE/OC nanocomposites in which the mass fraction of OC is 3%are improved significantly,expanding the application range of PE materials.