POLYSTYRENE

INTRODUCTION

Polystyrene is a vinyl polymer.

It has along hydrocarbon chain with a phenyl

group attached to every other carbon atom.

Produced by free radical vinyl polymerization,

from the monomer styrene.

Thermoplastic material

Amorphous polymer

RHEOLOGICAL BEHAVIOUR

Non-Newtonion fluid with viscoelastic properties.

The viscosity of polystyrene melts or solutions

is defined as the ratio of shear stress to shear

rate.

Electrical properties: Very good electrical

insulators

Mechanical properties: low impact strength

Thermal properties: Tg of unmodified 373K

between 90-110°C

Optical properties: naturally white

Low toxic product

Effect of Pressure

Viscosity and Shear rate

Mechanical properties

Thermal properties

ADVANTAGE & DISADVANTAGE

Clear

Hard

Easily process

Low cost

Low impact strength

Poor chemical resistance at room temperature

APPLICATION

Electrical

Electronic

Automotive

Industrial films

Food packaging