Analogue calorimetric studies of blends of poly(vinyl ester)s and polyacrylates
Analogue calorimetric studies of blends of poly(vinyl ester)s and polyacrylates
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DOI：
10.1021/ma950954n
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发表时间：
1996-02-26
期刊：
影响因子：
5.5
通讯作者：
Bhattacharyya, SN
中科院分区：
文献类型：
--
作者：
Rana, D;Mandal, BM;Bhattacharyya, SN
本文研究了聚乙烯基酯与聚丙烯酸酯共混物的阻热量热法。氢化单体用作相应聚合物的类似物。据发现，异构酯的不同，只有在COO基团的方向混合，只有很小的热变化，这可以是积极的或消极的。对于下列二元混合物：乙酸乙酯+丙酸甲酯、丙酸正丙酯+丁酸乙酯和丙酸苯酯+苯甲酸乙酯，相互作用能密度值B-12（单位：cal/cm（3））分别为-0.045，0.031和-0.076。两对非常相似的液体的负混合热，虽然出乎意料，但解释了为什么相应的聚合物是可混溶的。另一对的小的正混合热足以预测相应聚合物的分层，即，聚（丙烯酸正丙酯）和聚（丁酸乙烯酯），这与它们均匀混合的观察相矛盾。这表明，氢化单体并不总是乙烯基聚合物的相互作用能的预测适当的类似物。本文还介绍了一种新型的流动量热计。给出了上述酯二元混合物的H-E和V-E数据。
Analogue calorimetry for blends of poly(vinyl ester)s and polyacrylates has been studied. Hydrogenated monomers were used as analogues of the corresponding polymers. It is found that isomeric esters differing only in the orientation of the COO group mix with only small heat change, which can be positive or negative. The values of the interaction energy density, B-12 (in cal/cm(3)), are -0.045, 0.031, and -0.076, respectively, for the following binary mixtures; ethyl acetate + methyl propionate, n-propyl propionate + ethyl butyrate, and phenyl propionate + ethyl benzoate. The negative heat of mixing for the two pairs of very similar liquids, although unexpected, explains why the corresponding polymers are miscible. The small positive heat of mixing for the other pair is sufficient to predict demixing of the corresponding polymers, viz., poly(n-propyl acrylate) and poly(vinyl butyrate), which contradicts the observation of their homogeneous mixing. This suggests that hydrogenated monomers are not always the proper analogues for vinyl polymers for the prediction of the interaction energy. A novel flow calorimeter is also described. H-E and V-E data for binary mixtures of the above esters are presented.