TY - JOUR
T1 - Synthesis of Side-Chain Liquid Crystalline Polymethacrylates Containing Fluorinated Diarylacetylene-Based Mesogenic Side Groups
AU - Wu, Yann Hueiwu
AU - Lu, Yann Hong
AU - Hsu, Chain-Shu
PY - 1995/1/1
Y1 - 1995/1/1
N2 - The synthesis and characterization of side-chain liquid crystalline polymetnacrylates containing fluorinated diphenylacetylenic and naph-thylphenylacetylenic side groups are presented. The phase behavior of the prepared monomers and polymers was characterized by differential scanning calorimetry, optical polarizing microscopy, and x-ray diffraction. All of the methacrylate monomers exhibit no mesomorphic behavior. Polymers which contain eleven methylene units in their spacers reveal smectic mesomorphism. Polymers with a short spacer length, i.e., three or six methylene units, present either a nematic phase or no meso-phase. The glass transition temperatures of the obtained polymers decrease as the spacer length increases. The polymers containing fluorinated naphthylphenylacetylenic side groups show a higher tendency to form a mesophase than those containing fluorinated diphenylacetylenic side groups. Incorporation of a lateral fluoro-substituent in the meso-genic core decreases not only the possibility to form a mesophase but also the thermal stability of the mesophase.
AB - The synthesis and characterization of side-chain liquid crystalline polymetnacrylates containing fluorinated diphenylacetylenic and naph-thylphenylacetylenic side groups are presented. The phase behavior of the prepared monomers and polymers was characterized by differential scanning calorimetry, optical polarizing microscopy, and x-ray diffraction. All of the methacrylate monomers exhibit no mesomorphic behavior. Polymers which contain eleven methylene units in their spacers reveal smectic mesomorphism. Polymers with a short spacer length, i.e., three or six methylene units, present either a nematic phase or no meso-phase. The glass transition temperatures of the obtained polymers decrease as the spacer length increases. The polymers containing fluorinated naphthylphenylacetylenic side groups show a higher tendency to form a mesophase than those containing fluorinated diphenylacetylenic side groups. Incorporation of a lateral fluoro-substituent in the meso-genic core decreases not only the possibility to form a mesophase but also the thermal stability of the mesophase.
UR - http://www.scopus.com/inward/record.url?scp=0001519273&partnerID=8YFLogxK
U2 - 10.1080/10601329508013692
DO - 10.1080/10601329508013692
M3 - Article
AN - SCOPUS:0001519273
VL - 32
SP - 1471
EP - 1488
JO - Journal of Macromolecular Science - Pure and Applied Chemistry
JF - Journal of Macromolecular Science - Pure and Applied Chemistry
SN - 1060-1325
IS - 8-9
ER -