Mechanical properties of surface layer of unfilled polypropylene

David Manas,Jozef Dobransky,Lenka Chvatalova,N Mastorakis,V Mladenov,A Bulucea

doi:10.1051/matecconf/201712502045

Abstract

Using high doses of beta radiation for unfilled polypropylene (PP) and its influence on the changes of micromechanical properties of surface layer has not been studied in detail so far. The testing sapmles polypropylene (PP) were made by injection moulding technology and irradiated by high doses of beta radiation (0, 15 and 33 kGy). The changes in the microstructure and micromechanical properties of surface layer were evaluated using WAXS and instrumented ultra nano-hardness test. The results of the measurements showed considerable increase in micromechanical properties (indentation hardness, indentation elastic modulus) when low doses of beta radiation are used.

Highlights

Polypropylene is a versatile, low cost, chemically stable and lightweight polymer, which offers attractive mechanical, electrical and thermal properties due to its relative higher degree of crystallinity
A literature survey [6,7,8,9,10,11] indicates that effects of 14.89 MeV electron irradiation on polyethylene and polystyrene in the dose range of 57.6–576 KGy showed a greater red shift in absorption edge of polyethylene as compared to polystyrene [6]
Out of several types of radiations that can be used for radiation processing, high-energy electrons are of particular interest, especially for polymers, due to their high dose rates and high-energy deposition in lesser time intervals

Summary

Introduction

Polypropylene is a versatile, low cost, chemically stable and lightweight polymer, which offers attractive mechanical, electrical and thermal properties due to its relative higher degree of crystallinity. This is used in many applications such as radiation-sterilized medical and pharmaceutical components, food packaging materials and cosmetics [5]. Out of several types of radiations that can be used for radiation processing, high-energy electrons are of particular interest, especially for polymers, due to their high dose rates and high-energy deposition in lesser time intervals. Electron beam irradiation offers facility of easy control, maintenance of steady dose rate without any depletion and homogeneous energy deposition [2,6,12]

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