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Study on thermal stability of poled non‐linear optical polymers
Author(s) -
YuQuan Shen,
YuChun Yang,
Ling Qiu,
XingFa Fu,
ShangXian Yu,
JiangNan Gu,
G.R. Möhlmann,
C.P.J.M. Van Der Vorst
Publication year - 1996
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19960140514
Subject(s) - polymer , chemistry , side chain , relaxation (psychology) , glass transition , logarithm , thermal stability , diffusion , nonlinear system , polar , stability (learning theory) , chemical physics , polymer chemistry , thermodynamics , organic chemistry , physics , quantum mechanics , psychology , social psychology , mathematical analysis , mathematics , machine learning , computer science
A logarithmic expression is proposed to describe relaxation of the polar order in side chain polymers, together with a new way of plotting temperature dependent relaxation data. This results in a straight line extending even below the glass transition temperature in the case of poled nonlinear optics (NLO) side chain polymers. A simple procedure to determine the rotational diffusion constant D r is given and D r values of several polymer systems have been evaluated and compared with each other. It appears that, starting from the conventional and well known poled polymer system currently applied, a further lowering of D r by about 3 orders of magnitude is necessary in order to reach an acceptable orientational stability or lifetime of poled polymers for practical applications. Attempts have been made to introduce electron push‐pull substituents into high thermostable molecular frameworks and results of preliminary measurements are reported.