Blending, geldrawing and UV-photolysis of ultrahigh molecular weight polyethylene and poly(di-n-pentylsilylene)

Research paper by M. Möller, H. Frey, S. Sheiko

Indexed on: 01 Jun '93Published on: 01 Jun '93Published in: Colloid and polymer science


Blending of drawable UHMW-PE with poly(di-n-pentylsilylene) by concurrent gel crystallization was performed and the resulting blends drawn to tapes of high strength and high modulus. As shown by electron microscopy, poly(di-n-pentylsilylene) could be dispersed as nanometer-sized domains in the UHMW-PE matrix and afterwards cooriented by ultradrawing. In the drawn tapes the crystallinity of the PE component was unaffected by blending. Polarized FTIR-spectroscopy demonstrated high orientation of both blend components. Corresponding UV-spectra showed local conformational changes of the polysilylene chains, as well as strong UV-dichroism. Intensive UV-radiation yielded selective decomposition of the polysilylene while the PE was little affected. Reactive intermediates resulted in the formation of Si-H groups which might be helpful to introduce chemical links between PE fibrils.