Evaluation of PC/ABS Plastics with Different Blend Ratios

User Benefits

- With DSC, it is easy to measure the glass transition temperature required to mold amorphous plastics. - The glass transition temperature can be estimated from the PC blend ratio. - The composition ratio after molding PC/ABS plastic can be confirmed.

Introduction

PC/ABS plastics combine the respective advantages of polycarbonate (PC) and ABS. It is shock resistant, heat resistant, and workable, and is used for automotive interior components and office machines. In addition, it is an excellent insulation material, so it is widely used for electronic parts. With amorphous plastics such as PC/ABS plastics, thermal properties such as the linear expansion coefficient, specific heat, and thermal conductivity have an inflection point at the glass transition temperature. In addition, with injection molding, it is important to assess the glass transition temperature as a guide to the solidification temperature. Firstly, samples were molded with PC plastic and ABS plastic blend ratios varying from 0 % to 100 % at 25 % intervals. A differential scanning calorimeter was used to measures the glass transition temperature, so that the relationship between the sample blend ratio and the glass transition temperature could be evaluated. Next, the conformity between the blend ratio before molding and the composition ratio after molding was evaluated using a Fourier transform infrared spectrophotometer. This article introduces an example of the evaluation and comparison of samples using these two instruments.

November 26, 2021 GMT