| Summary: | 碩士 === 國立中興大學 === 化學工程學系 === 92 === In this research, surface agents including DTPPB and 2P4QCA were used as templates for the modification of montmorillonite (MMT) surface.According to the technology of thermotropic liquid crystalline polymer Type Ⅱ Vectra’s polymerization,
each acetoxy-monomer ( (A-HBA , A-HNA , A-BP) mole (%) = ( 73 , 27 , X ) X=0、0.5、1.0) of LCP and 1 phr modified MMT were made into LCP / MMT nanocomposites through melt polycondensation reactions.With 2P4QCA content increase, it increase the dispersion of modified clay in the nanocomposites, because it can react with acetoxy-monomers and produce acetic acid.Therefore thermal, mechanical and other properties of the nanocomposites will increase.The addition of small amounts of acetoxy-BP will control molecule weights of LCP.It can react with acetoxy-monomers and produce acetic acid to form copolyesters, because more acetoxy groups will increase reactive rate and lower the time of polymerization. Therefore it will terminate the reaction and control molecule weights of LCP and thermal and mechanical properties of the nanocomposites will lower.TEM reveals that most clay layers of organoclay were intercalated.DSC result showed that Tm and Tc of LCP / MMT nanocomposites increase 0.5~1.5 oC, POM reveals that LCP / MMT nanocomposites still have liquid crystallinity and were nematic schlieren textures.The isotropic temperature lower 2~3 oC owing to the addition of modified MMT, DMA reveals that storage modulus (E'') of nanocomposites increase 10~30 (%).
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