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Structure–property relationships in copolymers to composites: Molecular interpretation of the glass transition phenomenon
Author(s) -
Kaplan Donald S.
Publication year - 1976
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1976.070201001
Subject(s) - glass transition , materials science , copolymer , polymer , composite material , interpretation (philosophy) , polymer science , polymer chemistry , computer science , programming language
Structure is taken as the main theme in outlining the mechanical properties of polymer composites. Examples of two‐component polymer systems are selected from the literature showing their morphology, as evidenced from electron micrographs, and their corresponding mechanical properties, as evidenced by dynamic mechanical spectra. A compatibility number, N c , is defined in a continuous scheme from a compatible system (one glass transition, N c → ∞) to an incompatible system (two glass transitions, N c → 0). The point at which semicompatibility occurs, N c ≅ 1, is taken as the approximate universal segmental length associated with a glass transition. This length of 150 Å allows for 100 to 5000 CC bonds for an associated glass transition. The ramifications of this molecular interpretation of a glass transition are discussed, resulting in a denouncement of the time–temperature correspondence principle and a new interpretation of short‐segmental block copolymers.