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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of novel block copolymer from trans-4-hydroxy-L-propline and poly(ethylene glycol)
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Synthesis and characterization of novel block copolymer from trans-4-hydroxy-L-propline and poly(ethylene glycol)

机译：反式-4-羟基-L-脯氨酸与聚乙二醇合成新型嵌段共聚物及其表征

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摘要

A series of novel ABA-type block copolymers were synthesized by polymerization of trans-4-hydroxy-L-propline (HyP) in the presence of various molecular weight poly(ethylene glycol)s (PEGs), a bifunctional OH-terminated PEG using stannous octoate as catalyst. The optimal reaction conditions for the synthesis of the copolymers were obtained with 5 wt % stannous octoate at 140 deg C under vacuum (20 mmHg) for 24 h. The synthesized copolymers were characterized by IR spectroohotometry, proton nuclear magnetic resonance, differential scanning calorimetry, and Ubbelohde viscometer. The glass transition temperature (T_g) of the copolymers shifted to significantly higher temperature with increasng the number average degree of polymerization and HyP/PEO molar ratio. In contrast, the melting temperature (T_m) decreased with increasing the HyP/PEO molar ratio.
机译：在各种分子量的聚乙二醇（PEG），双官能OH端接的PEG存在下，通过反式-4-羟基-L-脯氨酸（HyP）的聚合反应，合成了一系列新型的ABA型嵌段共聚物辛酸亚锡作为催化剂。用5重量％的辛酸亚锡在140℃在真空（20mmHg）下24小时获得用于合成共聚物的最佳反应条件。合成的共聚物通过红外分光光度法，质子核磁共振，差示扫描量热法和乌氏粘度计进行表征。随着数均聚合度和HyP / PEO摩尔比的增加，共聚物的玻璃化转变温度（T_g）转移到明显更高的温度。相反，随着HyP / PEO摩尔比的增加，熔融温度（T_m）降低。

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