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首页> 外文期刊>RSC Advances >Facile synthesis and comparative study of poly(L-lactide) with linear-comb and star-comb architecture
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Facile synthesis and comparative study of poly(L-lactide) with linear-comb and star-comb architecture

机译：用线性梳和恒星梳理架构的聚（L-丙交酯）的容易合成与对比研究

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摘要

In this work, two series of linear-comb and star-comb well defined graft poly(L-lactide) (PLLA) have been synthesized conveniently by one-pot ring-opening polymerization (ROP) of L-lactide using functionalized polybutadiene macroinitiators. The used organocatalyst of 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU) allows the polymerization of L-lactide to proceed rapidly at room temperature. Kinetic studies of the ROP reaction in this system indicate first-order kinetics in monomer concentration. H-1 NMR and GPC techniques are employed to characterize the synthesized polymers, validating the formation of the desired comb structures with controllable chain length. Linear-comb and star-comb graft PLLA were comparatively studied as well as with linear PLLA by DSC and POM. The results reveal that the comb structure gives a remarkable improvement of PLLA crystallization ability in both crystallinity and growth rate of spherulites. Furthermore, the more compacted star-comb structure imposes restriction on chain mobility, which weakens the growth effect to some extent. It is found that the glass transition temperature (T-g) and melting temperature (T-m) significantly depend on the side chain length and backbone structure. Rheological studies of both melt and instinct viscosity of the solution show that star-comb PLLA has the lowest hydrodynamic volume compared with linear-comb PLLA and linear PLLA.
机译：在这项工作中，通过使用官能化聚丁二烯大草碱基剂，通过单壶开环聚合（ROP）通过单壶开环聚合（ROP）方便地合成了两系列线性梳和星形梳状接枝聚（L-丙交酯）（PLLA）。 1,8-diazabodicClo [5,4,0] UNDEC-7-ENE（DBU）的使用过的有机催化剂允许L-丙交酯的聚合在室温下快速进行。该系统中ROP反应的动力学研究表明单体浓度的一阶动力学。使用H-1 NMR和GPC技术来表征合成的聚合物，验证具有可控链长的所需梳理结构的形成。通过DSC和POM展开线性梳和星形移植物PLA以及线性PLLA。结果表明，梳状结构在球晶结晶度和生长速率下具有显着提高PLLA结晶能力。此外，更紧凑的星形结构对链迁移率施加限制，这在一定程度上削弱了生长效果。发现玻璃化转变温度（T-G）和熔融温度（T-M）显着取决于侧链长度和骨干结构。溶液熔体和本能粘度的流变研究表明，与线性梳和线性PLA相比，恒星梳PLA具有最低的流体动力学体积。

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  • 来源
    《RSC Advances》 |2015年第99期|共10页
  • 作者

    Leng Xuefei; Wei Zhiyong; Ren Yingying; Li Yang; Wang Yurong; Wang Qinyi;

  • 作者单位

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Sch Chem Engn Dept Polymer Sci &

    Engn State Key Lab Fine Chem Dalian 116024 Liaoning Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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