The investigation of selected properties of the porous moulded parts from talc-filled PP composites

Abstract

The investigation of the influence of chemical blowing agent addition and talc filler on structure and selected properties (weight, thickness, mechanical properties, surface state – gloss and colour – and thermal conductivity) of moulded parts from PP was the aim of this work. Microscopic investigations were made using mould with cavities of variable height. Addition of blowing agents to polymer material permits reducing of the injection cycle to the injection phase and cooling. Investigations showed that talc addition permits to obtain fine-cellular structure in moulded parts with blowing agent. It is possible, because talc can act as a nucleating agent, which has been shown in literature. As a result, moulded parts with blowing agent and talc had low weight, good mechanical properties compared to solid, unfilled parts. Main disadvantage of using blowing agent and talc is worsening of gloss and colour changing.