Ternary Stereocomplex and Hetero-Stereocomplex Crystallizability of Substituted and Unsubstituted Poly(lactic acid)s
Ternary Stereocomplex and Hetero-Stereocomplex Crystallizability of Substituted and Unsubstituted Poly(lactic acid)s
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DOI：
10.1021/acs.cgd.7b01559
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发表时间：
2018-01
影响因子：
3.8
通讯作者：
H. Tsuji;Noriaki Masaki;Y. Arakawa;Kazumasa Iguchi;T. Sobue
中科院分区：
文献类型：
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作者：
H. Tsuji;Noriaki Masaki;Y. Arakawa;Kazumasa Iguchi;T. Sobue
研究了由聚(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)组成的三元共混物的三元立体结晶性，以及由P(D-2H3MB)和聚乳酸组成的二元共混物的结晶性。对于溶剂挥发的P(D-2H3MB)/P(L-2H3MB)/P(L-2HB)(50/25/25)(摩尔/摩尔/摩尔)共混物，观察到了含有极少量P(D-2H3MB)和/或P(L-2H3MB)的TSC微晶的形成，而在沉淀的P(D-2H3MB)/P(L-2H3MB)/P(L-2HB)(50/25/25)共混物中观察到了P(D-2H3MB)/P(L-2H3MB)高温超导微晶的形成P(D-2H3MB)和/或P(L-2H3MB)均晶和P(L-2HB)均晶未形成TSC微晶。这是首次报道了所有与L取代的聚乳酸的TSC结晶。
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 l...