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Multiblock copolymers of PPC with oligomeric PBS: with low brittle-toughness transition temperature

机译：具有低聚PBS的PPC多嵌段共聚物：具有低脆性韧性转变温度

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摘要

In order to decrease the brittle-toughness transition temperature and increase the mechanical strength of poly(propylene carbonate) (PPC), a series of multiblock copolymers of poly(propylene carbonate)-multiblock-poly(butylene succinate) (PPC-mb-PBS) are designed and synthesized. H-1-NMR, DOSY and GPC results demonstrate the successful synthesis of PPC-mb-PBSs with designed multiblock sequence. The thermal, crystalline and mechanical properties of these PPC-mb-PBSs are evaluated by DSC, TGA, POM, tensile and tearing testing. Experiment results demonstrate that crystallinity, thermal and mechanical properties of PPC-mb-PBSs can be readily modulated by changing the composition and block length of PPC and PBS moieties. It is found that all the prepared PPC-mb-PBSs are semi-crystalline polymers with a melting temperature at 93-109 degrees C and a T-g at around -40 degrees C. Both crystallization rate and crystallinity of the multiblock copolymers increase with increasing both PBS content and PBS block length. As a consequent, the tensile strength increases with increasing PBS/PPC block ratios at room and lower temperatures. In conclusion, the amorphous PBS phase in the block copolymers acts as soft segment, endowing PPC-mb-PBS copolymers with much better flexibility than PPC at low temperature of 273 K when PPC segments are frozen.
机译：为了降低脆性韧性转变温度和增加聚（碳酸丙二醇酯）的机械强度（PPC），一系列聚（碳酸亚丙酯）的多嵌段共聚物的-multiblock - 聚（丁二酸丁二醇酯）（PPC-MB-PBS ）设计和合成。 H-1-NMR，DOSY和GPC结果证明了具有设计多嵌段序列的PPC-MB-PBS的成功合成。通过DSC，TGA，POM，拉伸和撕裂试验评估这些PPC-MB-PBS的热，结晶和机械性能。实验结果表明，通过改变PPC和PBS部分的组成和嵌段长度，可以容易地调节PPC-MB-PBS的结晶度，热和机械性能。发现所有制备的PPC-MB-PBSS是半结晶聚合物，其熔化温度为93-109℃，Tg约-40℃。多嵌段共聚物的结晶率和结晶度随着越来越多的两者而增加PBS含量和PBS块长度。因此，抗拉强度随着房间和较低温度的增加而增加，随着PBS / PPC块比的增加而增加。总之，嵌段共聚物中的无定形PBS相用作软链段，当PPC区段被冷冻时，在低温为273k时，赋予PPC-MB-PBS共聚物的PPC-MB-PBS共聚物在273k的低温下。

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  • 来源
    《RSC Advances》 |2018年第26期|共10页
  • 作者

    Qin Jiaxiang; Lin Limiao; Wang Shuanjin; Ye Shuxian; Luo Weikeng; Xiao Min; Han Dongmei; Meng Yuezhong;

  • 作者单位

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci &

    Engn State Key Lab Optoelect Mat &

    Technol Key Lab Low Carbon Chem &

    Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China;

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