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Thermosetting plastics are formed by ________

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Thermosetting plastics are formed by ________

(a) addition polymerization

(b) copolymerization

(c) condensation polymerization

(d) isomerism

The question was posed to me in class test.

My question is taken from Thermosetting Plastics, Particle Reinforced Composites topic in chapter Non Metallic Materials of Engineering Material & Metallurgy

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Right answer is (c) condensation polymerization

The explanation is: Thermosetting plastics are formed by condensation polymerization, whereas thermoplastics are plastic polymer substances formed by the addition polymerization process. Thermosetting plastics become permanently hard on the application of heat but do not soften on further heating.

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