pps proceeding - Abstract Preview
pps proceeding
Symposium: Blends, Reactive Systems & Elastomers
Poster Presentation
 
 

Impact strength enhancement for polycarbonate-based polymer alloy

Saito Tomotaka (1)*, Moriyama Tomokazu (1), Sumiya Nobuhiro (1)

(1) Toyota Boshoku - Aichi - Japan

Novel material preparation method for giving high flexural modulus and high impact strength is required for polymer-based materials to broaden usage. However, above two properties are considered as trade-off, therefore satisfying both high modulus and impact strength are still difficult. Adding the rubber, it is general method to enhance impact strength, decrease flexural modulus of the material. For impact strength enhancement without using the rubber, we prepared polycarbonate (PC)-based polymer alloy with adding low content of low density polyethylene (LDPE). The prepared polymer alloy increases 27% of the impact strength with adding only 0.7 wt% of LDPE and does not decreases the flexural modulus. From SEM micrograph analysis, the alloy formed sphere and hole in the matrix. It is considered the sphere is made of LDPE through EDS analysis. And the hole formed by immiscibility and the cooling shrinkage difference between PC and LDPE. At the range of 0.1 to 0.7 wt% (maximum impact strength point), Charpy impact strength increases with increasing of hole diameter (up to ~0.3 micro meter) and over 0.7 wt% of LDPE, impact strength decreases with hole diameter increasing. Charpy impact strength is controlled by hole diameter and the diameter has threshold about 0.3 micro meter.