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Synthesis and Properties of Azobenzene Side-chain Liquid Crystalline Copolymer Containing Pendant POSS

Author: WangXiaoTao
Tutor: JieXiaoLin
School: Huazhong University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Multi-faceted gathered silsesquioxane Liquid crystal polymers Azobenzene Photoisomerization LCD
CLC: O631.3
Type: Master's thesis
Year: 2007
Downloads: 186
Quote: 3
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Abstract


Polygon oligomer silsesquioxane ( POSS ) is a novel organic - inorganic hybrid material , because of their high thermal stability , flame retardancy , mechanical properties , and low dielectric constant , so that in the polymer / POSS composites have broad application prospects . In this thesis, through molecular design , amino POSS condensation reaction with acrylic synthetic acrylic modified POSS ( AC - POSS ) . And AIBN as initiator, AC - POSS and methyl acrylate liquid crystal monomer free radical copolymerization reaction , a liquid crystal polymer / POSS copolymer ( LCP - POSS ) were synthesized and confirmed by FT-IR and 1H NMR product the chemical structure . The study LCP - POSS solution , in UV - induced isomerization behavior , and found that with the increase in UV irradiation time , LCP -POSS azo group occurs from the trans to the cis configuration changes , the intensity of light absorption decreases . The LCP and LCP - POSS photoisomerization reaction showed first-order kinetics , but POSS introduction of the LCP matrix , due to the steric effect , reducing the azo phenyl trans - cis isomerization rate constant . The lcp - POSS LCD behavior found that gradually increases with the content of the POSS LCP - POSS liquid crystal phase transition temperature increases , the liquid crystal polarized light texture becomes gradually smaller ; and further increase POSS content , will make an LCP - POSS LCD gradually disappear. This is due to the steric effect of the POSS , reducing the flexibility and the ability to change conformation of the polymer chain , so that the LCP molecules stuffing structured decreased, an increase in the degree of disorder of the liquid crystal molecules of the liquid crystal performance increase with POSS content gradually weak trend .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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