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Blends and IPNs of Natural Rubber with Thermosetting Polymers

Thermoset polymers are widely used in diverse applications due to their excellent characteristics like high tensile strength, thermal stability, environmental stability, etc. In spite of the desirable properties, the major disadvantages are their low toughness and poor crack resistance and brittle nature at room temperature. Hence thermoset materials are to be toughened for many end-use applications. One of the most important methods for toughening epoxy resins is the incorporation of a secondary phase in the thermoset matrix. Functionalized liquid rubbers are one of the major toughener phases employed. The liquid rubber is compatible with epoxy resin before curing at the curing temperature. During cure of thermoset resins with hardener and rubbers phase separation takes place. The phase separated elastomer domains will toughen the matrix by different mechanism. The extent of toughness characteristics depend on the size, distribution and nature of elastomer domains. Mechanical properties including tensile strength, fracture toughness and impact properties are higher in elastomer toughened matrices compared to pristine thermosets. Elastomer incorporation changes the Tg of the matrix. Owing to the low modulus nature of elastomers there is slight compromise in thermal characteristics compared to virgin thermosets.

Print publication date: 05 Dec 2013
Copyright year: 2014
Print ISBN: 978-1-84973-610-7
PDF eISBN: 978-1-84973-764-7
From the book series:
Polymer Chemistry Series