Cristalização de homopolímero e copolímero de polietileno de alta densidade por nucleação heterogênea.

Abstract

The induced cristalization study of high density homopolymer and copolymer polyethylene was carried out by using a nucleating agent based on 1,2-ciclohexene dicarboxilic acid and calcium salt (1:1), (1R, 2S), CAS number 491589-22-1. The polymers chosen are used in stiff packages, processed by blow molding and the ultimate objective of this study is to reduce the production cycle but keeping the necessary product properties. The results showed that the addition of up to 0,15% of this nucleating agent to the homopolymer and up to 0,10% to the copolymer rised up the polymer crystalline fraction, improving slightly the copolymer mechanical properties but affecting the homopolymer stress cracking resistance performance. The bottles produced with higher nucleator levels, showed better contraction and transparency.