唐四叶, 曹欣祥, 崔路风, 张云. 聚乳酸的θ温度及其与溶度参数、相互作用参数的关系[J]. 云南大学学报(自然科学版), 2019, 41(6): 1208-1212. doi: 10.7540/j.ynu.20190304
引用本文: 唐四叶, 曹欣祥, 崔路风, 张云. 聚乳酸的θ温度及其与溶度参数、相互作用参数的关系[J]. 云南大学学报(自然科学版), 2019, 41(6): 1208-1212. doi: 10.7540/j.ynu.20190304
TANG Si-ye, CAO Xin-xiang, CUI Lu-feng, ZHANG Yun. θ temperature of poly(L-lactide) and its relationship with solubility parameter and interaction parameter[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(6): 1208-1212. DOI: 10.7540/j.ynu.20190304
Citation: TANG Si-ye, CAO Xin-xiang, CUI Lu-feng, ZHANG Yun. θ temperature of poly(L-lactide) and its relationship with solubility parameter and interaction parameter[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(6): 1208-1212. DOI: 10.7540/j.ynu.20190304

聚乳酸的θ温度及其与溶度参数、相互作用参数的关系

θ temperature of poly(L-lactide) and its relationship with solubility parameter and interaction parameter

  • 摘要: 由逐步升温法测定了聚乳酸溶液的浊点温度. 根据浊点温度与体积分数的关系,获得了聚乳酸溶液的θ温度. 结果表明:聚乳酸在2-己酮、环己醇、乳酸乙酯、溴苯、环己酮和氯苯中的θ温度分别为434.22 K、422.12 K、414.08 K、408.00 K、399.36 K和392.46 K,θ温度的变化符合溶度参数相近原则;θ温度随聚乳酸与溶剂溶度参数差值的降低而降低,随相互作用参数的下降而下降. θ温度与溶度参数差值之间的关系、θ温度与相互作用参数之间的关系均可用指数函数来准确描述.

     

    Abstract: The cloud point temperatures of poly(L-lactide) solutions were measured by stepwise warming. According to the relation between volume fraction of poly(L-lactide) and cloud point temperature, the θ temperature of poly(L-lactide) solutions were obtained. The θ temperatures of poly(L-lactide) in 2-hexanone, cyclohexanol, ethyl lactate, bromobenzene, cyclohexanone, and chlorobenzene are 434.22, 422.12, 414.08, 408.00, 399.36 K and 392.46 K, respectively. The variation of θ temperature accords with the principle of similar solubility parameter. The θ temperature decreases with the decrease of the absolute value of the solubility parameter difference between poly(L-lactide) and the solvent. Meanwhile, the θ temperature decreases with the decline of interaction parameter. The exponential function can accurately express the relationship between θ temperature and solubility parameter absolute difference as well as the relationship between θ temperature and interaction parameter.

     

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