New thermoshrinkable materials of radiation modified polypropylene- elastomer composites with cross-linking agents

In this work, electron beam modified heterogeneous composites of isotactic polypropylene with chlorinated polyethylene have been investigated. The blend composites with an excess of elastomer (30/70 wt%) have been modified with trimethylolpropane triacrylate and bisphenol-a-dimethacrylate cross-linking agents, and have been irradiated with accelerated electrons up to ionizing radiation doses from 25 to 150 kGy. The internal stresses characterizing the thermoshrinkage properties - thermorelaxation stresses formed in thermal heating and the residual stresses resulting in the process of full setting and cooling of materials have been investigated for radiation cross-linked oriented (extended up to 100 %) composite samples. The dependence of cross-linking efficiency and the thermoshrinkage characteristics of heterogeneous blends have been compared to properties of a low density polyethylene, which has been commonly used as thermoshrinkable material in polymer industry. It has been proved that the radiation-chemically modified polypropylene multiphase composites with elastomers and the crosslinking promoters are comparable perspective materials for creation thermoshrinkable materials with higher or similar thermoshrinkage properties compared to currently exploited thermoshrinkable materials.