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《Materials Science and Technology》 2009-06
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Effect of 1,3-2,4-di(p-methylbenzylidene) xylitol on crystalline structure and property of PP

NI Zhuo,NIU Ke(School of Chemistry and Chemical Engineering,Shenzhen University,Shenzhen 518060,China)  
1,3-2,4-di(p-methylbenzylidene) xylitol(MDBX) has been synthesized in the lab from p-methyl benzaldehyde and xylitol.Under the optimized reaction conditions that cyclohexane was used as solvent,the molar ratio of p-dimethyl benzaldehyde to xylitol was 2. 4∶1,and the mass fractions of catalyst and accelerator to raw materials were 4.0% and 430% respectively,the yield of MDBX exceeded 97.7%,and the melting point was 244 ℃~246 ℃. A series of PP samples was prepared based on the amount of nucleating agent used. The effect of MDBX on their crystalline structures and thermal property FT-IR,DSC,WAXD,polarized light microscopy,and so on . Extensive experiments demonstrate that MDBX can nucleate PP effectively and efficiently in α form of crystalline morphology,induce the generation of a large spherulites and increase the crystalline density. The great improvement of optical properties can be achieved with 0.5% addition of MDBX.
【Fund】: 2007年广东省科技计划项目资助(2007B010600037)
【CateGory Index】: TQ325.14
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