COMPLEXATION OF STEREOREGULAR POLY(METHYL METHACRYLATES) .12. COMPLEXATION PROCESS IN DILUTE-SOLUTION
COMPLEXATION OF STEREOREGULAR POLY(METHYL METHACRYLATES) .12. COMPLEXATION PROCESS IN DILUTE-SOLUTION
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DOI：
10.1021/ma00185a054
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发表时间：
1988-07-01
期刊：
影响因子：
5.5
通讯作者：
CHALLA, G
中科院分区：
文献类型：
--
作者：
SCHOMAKER, E;HOPPEN, H;CHALLA, G
本文用孤立络合物差示扫描量热法、溶液粘度法和等温混合量热法研究了等规和间规PMMA在稀溶液中的立体络合过程。这些结果与先前公布的调查结果相结合。看来，基本上相同的机制，提出了在散装络合过程中可以解释观察到的现象，包括以前报道的associationand聚集阶段后络合。两个主要的过程被区分：络合和随后的结晶的复杂的链节，导致复杂的颗粒的形成。相对于结晶，建议两种模式：边缘胶束和层状生长，取决于所谓的临界序列长度下的条件和流动性的链节。这些参数似乎是由各种变量，如溶剂质量，温度，混合比，和立构规整度的影响。
The process of stereocomplexation between isotactic and syndiotactic PMMA in dilute solution was studied by means of differential scanning calorimetry of isolated complexed material, solution viscometry, and isothermal mixing calorimetry. The results were combined with results of investigations previously published. It appeared that essentially the same mechanism as proposed for the complexation process in bulk can account for theobserved phenomena, including the previously reported associationand aggregation stages following complexation. Two main processes are distinguished: complexation and subsequent crystallization of complexed chain sections, leading to the formation of complex particles. With respect to crystallization, two modes are suggested: fringed-micellar and lamellar growth, depending on the so-called critical sequence length under the conditions employed and the mobility of the chain sections. These parameters appear to be influenced by various variables such as solvent quality, temperature, mixing ratio, and tacticity.