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The peculiarities of physical network formation in carboxyl‐containing poly(dimethylcarbosiloxane)
Author(s) -
Rogovina Lidiya Z.,
Vasilev Viktor G.,
S. Papkov Vladimir,
Shchegolikhina Olga I.,
Slonimskii Grigorii L.,
Zhdanov Alexandr A.
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950930118
Subject(s) - intermolecular force , intramolecular force , hydrogen bond , polar , polymer , elasticity (physics) , materials science , polymer chemistry , modulus , young's modulus , chemical physics , chemistry , chemical engineering , crystallography , composite material , molecule , organic chemistry , physics , astronomy , engineering
An unusual effect of physical network formation during heating or at room temperature alter previous heating was found for originally liquid poly(dimethylcarbosiloxane) containing 0.5 – 2.5 mol% of side carboxyl groups by means of the measurement of its Theological properties. The reason for this behaviour is supposed to be the predominance of intramolecular hydrogen bonding of COOH groups in original polymer and the intra– to Intermolecular bonds rearrangement during heating. The alternative reason can be the microphase separation with domains of COOH groups. The reversibility of the network is confirmed by the decrease in the elasticity modulus, development of irreversible deformation on further heating and by break‐up of Junctions on the addition of small amounts of polar liquids.