Properties of Thermoset Plastics
This handbook introduces the various types of thermoset plastics along with their advantages and applications.
TABLE OF CONTENTS Properties of Thermoset Plastics
Chapter 1: Properties of Thermoset Plastics
Organic materials of high molecular weight, which can be molded into any desired form when subjected to heat and pressure in the presence of a catalyst, are known as plastic. In other words, any material that shows the property to deform or change shape under pressure is considered a plastic material.
The basic binding materials in plastic are resins, which undergoes polymerization and condensation reactions during the preparation of plastic. There are two types of plastics, thermoplastics and thermoset plastics. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polytyrene (PS), nylons, and polytetrofluoro ethylene (PTFE or Teflon). Examples of thermoset plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes.
This handbook discusses the types, properties, uses, and advantages of thermoset plastics.
Overview of Thermoset Plastics
Thermoset plastics harden during the molding process and do not soften after solidifying. During molding, these resins acquire three-dimensional cross-linked structure with predominantly strong covalent bonds that retain their strength and structure even on heating. However, on prolonged heating, thermoset plastics get charred. In the softened state, these resins harden quickly with pressure assisting the curing process. Thermoset plastics are usually harder, stronger, and more brittle than thermoplastics and cannot be reclaimed from wastes. These resins are insoluble in almost all inorganic solvents.
Uses of Thermoset Plastics
Thermoset plastics have assumed a very important position as engineering materials. Their importance can be compared with steel and ceramics. Thermoset plastics are used:
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For making electrical goods
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In...
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