DSC and X-ray studies on side-chain crystallization of comb-like polymers |
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Authors: | Y Shibasaki H Saitoh K Chiba |
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Institution: | (1) Faculty of Science, Saitama University, 255 Shimo-Okubo, 338 Urawa, Japan |
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Abstract: | Thermal properties of acrylate and methacrylate monomers containing long-fluorocarbon chains (H(CF2)nCH2OCOCH=CH2, (FnA) and H(CF2)nCH2OCOC(CH3)=CH2, (FnMA), wheren=6, 8, 10) and their comb-like polymers have been investigated by differential scanning calorimeter (DSC) and X-ray diffraction. The comb-like polymers (PF10A and PF10MA) with sufficiently long-fluorocarbon chains showed a simple melting and crystallizing behavior. For the fusion of PF10A in 1st heating, enthalpy change H
f was 18 kJ mol–1 and entropy change S
f was 45 J K–1 mol–1, while for PF10MA the values H
f and Sf were 5.3 kJ mol–1 and 14 J K–1 mol–1, respectively. Melted PF8A crystallized slowly, whereas PF8MA with same fluorocarbon chain and also both of PF6A and PF6MA with shorter fluorocarbon chains can hardly crystallize by the aggregation of side-chains. Effects of the length of side-chain and the flexibility of main chain on the side-chain crystallization of comb-like polymers are clear. Crystallization process of the methacrylate monomers was sensitively affected by the scanning rate of DSC measurement and the length of fluorocarbon chains. |
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Keywords: | comb-like polymer DSC fluorocarbon chain side-chain crystallization X-ray diffraction |
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