Glass transformation temperatures of poly(vinyl alkyl ethers) and poly(vinyl alkyl sulfides)
Glass transformation temperatures of poly(vinyl alkyl ethers) and poly(vinyl alkyl sulfides)
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聚（乙烯基烷基醚）和聚（乙烯基烷基硫醚）的玻璃化转变温度
DOI：
10.1002/pol.1964.100021024
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发表时间：
1964
期刊：
影响因子：
--
通讯作者：
G. Trick
中科院分区：
文献类型：
--
作者：
J. Lal;G. Trick
合成了一些相对分子质量较高的聚乙烯基烷基醚和聚乙烯基烷基硫化物。用膨胀计量法测定了各种聚合物的玻璃化转变温度Tg。总体而言，Tg值随正构烷基团长度的增加而降低。用液体自由体积概念处理了聚乙烯基正烷基醚的玻璃化转变温度与烷基长度之间的关系。聚合物烷基上的支化提高了玻璃化转变温度。聚乙烯基N-烷基硫化物的Tg值比其含氧类似物高约35℃。比较了聚乙烯基正构烷基醚和正α-烯烃聚合物的玻璃化转变温度，结果表明侧链上的醚基和亚甲基对玻璃化转变温度的影响是相当的。通过对聚(乙烯基正构烷基醚)和聚(正构烷基甲基丙烯酸酯)的比较，得出主链的性质是决定侧链结晶发生的难易程度的重要结论。
A number of poly(vinyl alkyl ethers) and poly(vinyl alkyl sulfides) of reasonably high molecular weight were prepared. Glass transformation temperatures Tg of the various polymers were measured dilatometrically. In general, the Tg value decreased with increasing length of the n-alkyl group. Data relating Tg values of poly(vinyl n-alkyl ethers) with length of n-alkyl group were treated in terms of free volume concepts of the liquid state. Branching on the alkyl group of the polymer increased the Tg value. Poly(vinyl n-alkyl sulfides) had Tg values about 35°C. higher than their oxygen analogs. A comparison of poly(vinyl n-alkyl ethers) and polymers of normal α-olefins showed that the ether group and methylene group in side chains were equivalent in influencing the glass transformation temperatures. From a comparison of poly(vinyl n-alkyl ethers) and poly(n-alkyl methacrylates) it is concluded that the nature of the backbone is important in determining the ease with which side chain crystallization takes place.