埃洛石对聚丙烯树脂流变行为的影响

Rheological Behavior of Polypropylene Resins Containing a Small Amount of Halloysite

以埃洛石纳米管（HNT）掺杂的高效Mg Cl2/Ti Cl4催化剂催化丙烯聚合,制备了含极少量HNT（（20-200）×10^-6（w））的聚丙烯树脂PP-HNT,对PP-HNT树脂熔体状态下的动态剪切流变行为进行了研究。实验结果表明,在低剪切频率时,PPHNT树脂的储能模量曲线出现平台区,熔体表现出类固行为;树脂基体的相对分子质量越低,类固行为越明显,表明分散的HNT在树脂基体中形成了逾渗网络。HNT逾渗网络的形成预期会使PP-HNT树脂具有较强的抗熔垂性能,可获得更好的加工性。

Polypropylene（PP） resins containing tiny amount of（（20- 200）×10^-6（w））halloysite nanotubes（HNT） were prepared with a high-efficiency Mg Cl2/Ti Cl4 catalyst in situ doped with HNT. The dynamic shear rheological behavior of the PP-HNT resins was investigated. Dynamic frequency sweep tests showed that the storage modulus of the PP-HNT resins exhibited a plateau-like regime at low shear frequency,which indicated the formation of percolated nanotube network. The formation of the HNT network is presumed to be beneficial to the melt processability of the PP-HNT resins.