Aggregation of stereoregular poly(methyl methacrylates)
Aggregation of stereoregular poly(methyl methacrylates)
复制标题
有规立构聚甲基丙烯酸甲酯的聚集
DOI：
10.1016/0001-8686(87)85010-8
复制
发表时间：
1987
影响因子：
15.6
通讯作者：
B. Schneider
中科院分区：
文献类型：
--
作者：
J. Spĕvác̆ek;B. Schneider
综述了立体规聚甲基丙烯酸甲酯(PMMA)聚集态研究的实验结果，并对其进行了评价。除了溶液中的聚集外，还注意到了固体中相应的有序结构。平行讨论了三种立体规整PMMA聚集体：1)等规聚甲基丙烯酸甲酯(I)和间同立构聚甲基丙烯酸甲酯(S)溶液混合形成的聚甲基丙烯酸甲酯立体络合物；2)S-聚甲基丙烯酸甲酯的自聚集；3)I-PMMA的自聚集。在导言部分，综述了立体规整PMMA在溶液和固体中的构象结构和动力学行为。在第四部分中，论证了各种物理方法获取有关PMMA集合体的各种类型信息的可能性。每种方法都列举了PMMA集合体研究的主要成果。PMMA集合体的结构问题包括以下三个部分。第五部分讨论了聚甲基丙烯酸甲酯立体络合物的化学计量以及立体规整性对立体络合物聚集体和S-聚甲基丙烯酸甲酯自聚集体的形成和热稳定性的影响，给出了这些体系在不同溶剂中聚集所需的最小S序列长度的值。对聚集的时间进程及其各个阶段也给予了关注。在第六部分，根据核磁共振和振动光谱的结果，证明了立体规则PMMA的聚集是由酯基团的相互作用引起的。本章还讨论了PMMA聚集体中的主链构象结构；结果表明，立体规则序列具有近似的TT结构。在第七部分中，描述了聚集对聚集体中链的迁移性和相互有序性的影响。实验结果表明，立体规整的PMMA聚集体形成了双螺旋结构。第八部分概述了与立体规则聚甲基丙烯酸甲酯(包括甲基丙烯酸甲酯的“复制聚合”)直接相关的其他一些体系的信息。
In this review, experimental results obtained in studies of aggregation of stereoregular poly(methyl methacrylates) (PMMA) are reviewed and critically evaluated. Besides aggregation in solution, attention is also paid to the corresponding ordered structures in the solid state. Three types of aggregates of stereoregular PMMA are discussed in parallel: 1) the stereocomplex of PMMA formed by the mixing of solutions of isotactic (i) and syndiotactic (s) PMMA; 2) the self-aggregates of s-PMMA; and 3) the self-aggregates of i-PMMA.In the introductory sections, information on the conformational structure and dynamic behavior of stereoregular PMMA in solutions and in the solid state is summarized. In Part IV, the possibilities of various physical methods in obtaining various types of information on PMMA aggregates are demonstrated. With each method, the main results obtained in studies of PMMA aggregates are cited.The problems of the structure of PMMA aggregates are the subject of the following three parts. Information concerning the stoichiometry of the PMMA stereocomplex and the effects of stereoregularity on the formation and thermal stability of stereocomplex aggregates and s-PMMA self-aggregates is discussed in Part V. For these systems in various solvents, the values of the minimum length of s-sequences necessary for aggregation are given. Attention is also paid to the time-course of aggregation and to its various stages. In Part VI, based on the results of NMR and vibrational spectroscopy, it is shown that aggregation of stereoregular PMMA is caused by interactions of ester groups. The backbone conformational structure in PMMA aggregates is also discussed in this chapter; it is shown that the stereoregular sequences assume an approximately tt structure. In Part VII, the effects of aggregation on the mobility and mutual ordering of the chains in aggregates are described. Experimental results indicating that double-helical structures are formed in aggregation of stereoregular PMMA are discussed. Information on some other systems directly related to the aggregation of stereoregular PMMA (including the “replica polymerization” of methyl methacrylate) is summarized in Part VIII.