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Glass transitions of topologically interpenetrating polymer networks
Author(s) -
Frisch H. L.,
Frisch K. C.,
Klempner D.
Publication year - 1974
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760140910
Subject(s) - materials science , polymer , polyester , epoxy , glass transition , component (thermodynamics) , copolymer , quantum entanglement , polymer science , polymer chemistry , phase (matter) , chain (unit) , interpenetrating polymer network , phase transition , composite material , thermodynamics , organic chemistry , chemistry , astronomy , physics , quantum mechanics , quantum
Two component topologically‐interpenetrating polymer networks were made of the SIN type (simultaneous interpenetrating network) composed of two polyurethanes (a polyether‐based and a polyester‐based) in combination with an epoxy resin, a polyacrylate and two unsaturated polyesters. The linear polymers and/or prepolymers were combined in solution and in bulk together with the necessary crosslinking agents and catalysts. Films were cast and chains extended and crosslinked in situ . All of the IPN's exhibited one glass transition ( T g ) intermediate in temperature to the T g 's of the component networks, and as sharp as the T g 's of the components. This suggests that phase separation may not occur and thus some chain entanglement (interpenetration) of the two networks is involved. The observed T g 's are always several degrees lower than the arithmetic means of the component T g 's. A theory based on interpenetration is developed to account for this.
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