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Miscibility between PS and PSAN Affected by Solvent and Temperature of the System

Chinese Journal of Polymer Science 2014年第11期32卷 1442-1449页

作者： Zafarullah Khan Marwat Musa Kaleem Baloch Department of Chemistry Gomal University Dera Ismail Khan Khyber PakhtoonkhwaPakistan

The influence of solvent on the miscibility of polystyrene（PS） and poly（styrene-co-acrylonitrile）（PSAN） blends has been investigated viscometrically. The miscibility of different PS/PSAN blend（30/70, 50/50 and 70/30） compositions in acetone and benzene at 20, 30, and 40 °C was investigated on the basis of the sign of Chee（ΔB and ）, and Sun’s（α） criteria. The values of these parameters were evaluated from the analyses of reduced viscosity data of binary（solvent/polymer） and ternary（solvent/polymer1/polymer2） polymer systems. These investigations indicated partial miscibility for both the blend systems. However, PS/PSAN/acetone blend system showed somewhat higher partial miscibility than the PS/PSAN/Benzene blend system highlighting the impact of solvent over the polymer-polymer interactions and hence their miscibility. The results obtained through viscometry were also corroborated by the refractive index.and density results for the blends under study. The effect of temperature on miscibility in both the cases was almost negligible.

关键词： Miscibility Polystyrene Poly(styrene-co-acrylonitrile) Viscosity Density refractive index.

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Special Odd-Even Effect of Degree of Oligomerization on Properties of Cyclic Oligoesters

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Chinese Journal of Polymer Science 2015年第8期33卷 1069-1069,1070-1073页

作者： Jun Wu Tao-guang Qu Ling-feng Gao Xiao-ming Yang Xiao-hong Li 屠迎锋 Xiu-lin Zhu Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow University

We demonstrate here seven pure cyclic samples, which belongs to two series of oligoesters, cyclic oligo（trimethylene terephthalate）s （COTTs） and cyclic oligo（butylene terephthalate）s （COBTs）, showing odd-even effect of degree of oligomerization （repeating units number） on properties. The pentamer of COTT and trimer of COBT show much lower melting temperature, and the trimer of COTT and trimer of COBT show significant lower refractive index. which can be ascribed to the low packing density of cyclic oligoesters with odd number of degree of oligomerization. Our results reveal the discrete property change as a function of cyclic size of oligomers, which can be used to design materials with special properties.

关键词： Cyclic polymer Oligomer Odd-even effect refractive index.

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