Effect of polymer architecture on self-diffusion of LC polymers

Clingman, Scott; Mao, Guoyong; Ober, Christopher K.; Colby, Ralph H.; Brehmer, Martin; Zentel, Rudolf; Bignozzi, Maria Chiara; Laus, Michele; Angeloni, A. S.; Gillmor, J. R.

doi:10.1002/(sici)1099-0488(19990301)37:5<405::aid-polb1>3.0.co;2-u

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“…LC poly-(meth)acrylates with azobenzene photochromic side chains. 11,[25][26][27][28] On the other hand, we have reported similar mesophases for numerous chiral homopolymers (polymethacrylates, polysiloxanes) [29][30][31][32] and their copolymers with nonchiral azodye comonomers. 24,33,34 The detailed study of the "transparent smectic mesophase" is presented in our recent paper; 32 here we will summarize them briefly.…”

Section: Resultsmentioning

confidence: 82%

“…We should comment first that such a visually isotropic mesophase with a hidden smectic ordering was never observed by nonchiral polymers of a similar structure, as e.g. LC poly(meth)acrylates with azobenzene photochromic side chains. ,− On the other hand, we have reported similar mesophases for numerous chiral homopolymers (polymethacrylates, polysiloxanes) − and their copolymers with nonchiral azodye comonomers. ,, The detailed study of the “transparent smectic mesophase” is presented in our recent paper; here we will summarize them briefly.…”

Section: Resultsmentioning

confidence: 87%

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Bistable Phase Behavior and Kinetics of Nonisothermal Mesophase Formation in a Chiral Side Chain Polymethacrylate

Kozlovsky¹,

Jungnickel²,

Ehrenberg³

2005

Macromolecules

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Nonisothermal kinetics of smectic phase formation in a chiral liquid crystalline (LC) azodye polymer is studied. The Ozawa exponent value of n ∼ 2.5 is estimated for narrow polymer fractions with M w/M n ∼ 1.3−1.6 but a temerature-dependent value, 0.5 < n < 1.2, for the raw polymer of M w/M n ∼ 2.6. The effect of molar mass on mesomorphism is studied, and the dependence of melting temperature on subsequent heating from the rate of previous cooling, r, is theoretically explained. The narrow fractions show a “bistable” phase behavior forming conventional Sm A phase on slow cooling, r < 1 K/min, but another (probably a highly twisted TGB A*) mesophase on fast cooling, r > 1 K/min. A theoretical model for such a behavior is suggested, and the structure of the two phases is studied by SAXS. The applicability of the Kissinger approach to estimation of activation energy for TGB A* phase formation is discussed.

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