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Which of the following types of molecular structure present in thermosetting polymers?

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Which of the following types of molecular structure present in thermosetting polymers?

(a) Linear polymers

(b) Branched polymers

(c) Cross-linked polymers

(d) Network polymers

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I need to ask this question from Processing of Thermosetting Plastics in portion Moulding with Polymers of Casting-Forming-Welding II

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The correct option is (c) Cross-linked polymers

Best explanation: Cross-linked polymers are described by adjacent linear chains that are brought one to another at several locations by covalent bonds. Cross linking is completed by a non-reversible chemical reaction. Often, cross-linking is finished by additive atoms which are covalently bonded to the chains in the thermosetting polymers.

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