The ternary stereocomplex (TSC) crystallizability of ternary substituted and unsubstituted poly(lactic acid) blends composed of poly(d-2-hydroxy-3-methylbutanoic acid) [P(D-2H3MB)], poly(l-2-hydroxy-3-methylbutanoic acid) [P(L-2H3MB)], and poly(l-2-hydroxybutanoic acid) [P(L-2HB)] or poly(l-lactic acid) (PLLA), together with heterostereocomplex (HTSC) crystallizability of binary blends composed of P(D-2H3MB) and PLLA, were investigated for solvent evaporated and precipitated samples. For the solvent evaporated P(D-2H3MB)/P(L-2H3MB)/P(L-2HB) (50/25/25) (mol/mol/mol) blend, formation of TSC crystallites with a very small amount of P(D-2H3MB) and/or P(L-2H3MB) homocrystallites was observed, whereas in the precipitated P(D-2H3MB)/P(L-2H3MB)/P(L-2HB) (50/25/25) blend, P(D-2H3MB)/P(L-2HB) HTSC crystallites, P(D-2H3MB) and/or P(L-2H3MB) homocrystallites, and P(L-2HB) homocrystallites were formed without formation of TSC crystallites. This is the first report for TSC crystallization of all substituted PLAs with linear and branched side chains. In contrast, in both solvent evaporated and precipitated P(D-2H3MB)/P(L-2H3MB)/PLLA (50/25/25) (mol/mol/mol) blends, P(D-2H3MB)/P(L-2H3MB) homostereocomplex crystallites, P(D-2H3MB) and/or P(L-2H3MB) homocrystallites, and PLLA homocrystallites were formed without crystallization of TSC crystallites. It was confirmed that HTSC between P(D-2H3MB) and PLLA is not formed in both solvent evaporated and precipitated P(D-2H3MB)/PLLA (50/50) (mol/mol) blends. Based on reported and present results, we proposed the rule for TSC and HTSC crystallization of, respectively, binary and ternary substituted and unsubstituted poly(lactic acid)s, wherein all the optically active polymer components are included in the same SC crystalline lattice. The difference in carbon numbers of side chains between the two polymers with different chemical structures and opposite configurations is one.

中文翻译：

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取代的和未取代的聚乳酸的三元立体配合物和杂立体配合物的结晶性

由聚（d -2-羟基-3-甲基丁酸）[P（D-2H3MB）]，聚（l -2-羟基- 3-甲基丁酸] [P（L-2H3MB）]和聚（l -2-羟基丁酸）[P（L-2HB）]或聚（l-乳酸（PLLA），以及由P（D-2H3MB）和PLLA组成的二元共混物的杂立体配合物（HTSC）的结晶性，被研究用于溶剂蒸发和沉淀的样品。对于溶剂蒸发的P（D-2H3MB）/ P（L-2H3MB）/ P（L-2HB）（50/25/25）（mol / mol / mol）混合物，形成了TSC晶体，其中有非常少量的观察到P（D-2H3MB）和/或P（L-2H3MB）同晶，而在沉淀的P（D-2H3MB）/ P（L-2H3MB）/ P（L-2HB）中（50/25/25）共混物，P（D-2H3MB）/ P（L-2HB）HTSC微晶，P（D-2H3MB）和/或P（L-2H3MB）同晶，以及P（L-2HB）同晶形成而未形成TSC微晶。这是所有具有直链和支链侧链的取代PLA进行TSC结晶的第一个报告。相比之下，在蒸发和沉淀的两种溶剂中，P（D-2H3MB）/ P（L-2H3MB）/ PLLA（50/25/25）（mol / mol / mol）混合物中，P（D-2H3MB）/ P（L-2H3MB）形成了纯立体复合物微晶，P（D-2H3MB）和/或P（L-2H3MB）均微晶和PLLA均微晶而没有TSC微晶的结晶。证实在溶剂蒸发和沉淀的P（D-2H3MB）/ PLLA（50/50）（mol / mol）混合物中均未形成P（D-2H3MB）和PLLA之间的HTSC。基于已报道和目前的结果，我们提出了二元和三元取代和未取代的聚乳酸的TSC和HTSC结晶规则，其中所有光学活性聚合物组分均包含在同一SC晶格中。