基于2-羟基链烷酸的l-构型和d-构型错位不对称随机共聚物之间的立体络合物结晶,Crystal Growth & Design

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基于2-羟基链烷酸的l-构型和d-构型错位不对称随机共聚物之间的立体络合物结晶
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-08-10 00:00:00 , DOI: 10.1021/acs.cgd.8b00863
Hideto Tsuji ₁ , Katsuya Osanai ₁ , Yuki Arakawa ₁

Affiliation

立体络合物（SC）结晶在交错不对称的2-羟基链烷酸基无规共聚物共混物升-型聚（升-2- hydroxybutanoic酸共-升-乳酸）[P（L-2HB-共-LLA）]（ 50/50）和d -型聚（d -2- hydroxybutanoic酸共- d -2-羟基-3-丁酸）[P（d-2HB-共-D-2H3MB）]（50/50）构成的首次报道了具有三种不同化学结构的单体的合成。交错不对称无规共聚物共混物的SC微晶的广角X射线衍射谱和晶面距离值与聚（l -2-羟基丁酸）/聚（d -2-羟基丁酸）SC晶体。共聚物共混物样品的SC熔融温度值远高于非共混P（L-2HB- co）的P（L-2HB- co -LLA）和P（D-2HB- co -D-2H3MB）单个晶体的熔点温度co -LLA）和P（D-2HB- co -D-2H3MB）样品（分别为90.5和96.2–126.0°C）。此外，本文首次报道了基于2-羟基链烷酸的无规共聚物P（D-2HB- co-羟基丁酸单元含量约为50 mol％的-D-2H3MB）可结晶，强烈表明具有相同构型的2-羟基丁酸和2-羟基-3-甲基丁酸的无规共聚物应在所有2处均可结晶。 -羟基丁酸单元的含量。非共混无规共聚物P（D-2HB- co -D-2H3MB）的结晶性高于非共混无规共聚物P（L-2HB- co - LLA）的结晶性。本发明和已报道的结果显示2-羟基链烷酸单体单元与其他类型的2-羟基链烷酸单体单元在其l-和d-构型均聚物共混物，非共混的l或d中具有高共结晶性。-构型的无规共聚物以及l-和d-构型的无规共聚物共混物。

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Stereocomplex Crystallization between l- and d-Configured Staggered Asymmetric Random Copolymers Based on 2-Hydroxyalkanoic Acids

Stereocomplex (SC) crystallization in staggered asymmetric 2-hydroxyalkanoic acid-based random copolymer blends of l-configured poly(l-2-hydroxybutanoic acid-co-l-lactic acid) [P(L-2HB-co-LLA)] (50/50) and d-configured poly(d-2-hydroxybutanoic acid-co-d-2-hydroxy-3-butanoic acid) [P(D-2HB-co-D-2H3MB)] (50/50) composed of monomers with three different chemical structures was reported for the first time. The wide-angle X-ray diffractometry profiles and interplanar distance values of SC crystallites of the staggered asymmetric random copolymer blends were similar to those of poly(l-2-hydroxybutanoic acid)/poly(d-2-hydroxybutanoic acid) SC crystallites. The melting temperature values of SC of copolymer blend samples were much higher than those of P(L-2HB-co-LLA) and P(D-2HB-co-D-2H3MB) individual crystallites of the nonblended P(L-2HB-co-LLA) and P(D-2HB-co-D-2H3MB) samples (90.5 and 96.2–126.0 °C, respectively). Moreover, this article reports for the first time that the 2-hydroxyalkanoic acid-based random copolymer P(D-2HB-co-D-2H3MB) with 2-hydroxybutanoic acid unit content at approximately 50 mol % is crystallizable, strongly suggesting that the random copolymers of 2-hydroxybutanoic acid and 2-hydroxy-3-methylbutanoic acid with the identical configurations should be crystallizable at all 2-hydroxybutanoic acid unit contents. The crystallizability of the nonblended random copolymer P(D-2HB-co-D-2H3MB) was higher than that of the nonblended random copolymer P(L-2HB-co-LLA). The present and reported results exhibit the high cocrystallizability of 2-hydroxyalkanoic acid monomer units with other types of 2-hydroxyalkanoic acid monomer units in their l- and d-configured homopolymer blends, nonblended l- or d-configured random copolymers, and l- and d-configured random copolymer blends.

更新日期：2018-08-10

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