Multiblock copolymers of PPC with oligomeric PBS: with low brittle–toughness transition temperature†,RSC Advances

当前位置： X-MOL 学术 › RSC Adv. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Multiblock copolymers of PPC with oligomeric PBS: with low brittle–toughness transition temperature†
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1039/c8ra01588k
Jiaxiang Qin ₁ , Limiao Lin ₁ , Shuanjin Wang ₁ , Shuxian Ye ₁ , Weikeng Luo ₁ , Min Xiao ₁ , Dongmei Han ₁ , Yuezhong Meng ₁

Affiliation

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. ¹H-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 °C and a T_g at around −40 °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.

中文翻译：

PPC 与低聚 PBS 的多嵌段共聚物：具有低脆韧性转变温度†

为了降低聚碳酸亚丙酯（PPC）的脆韧转变温度和提高机械强度，聚碳酸亚丙酯-多嵌段-聚丁二酸丁二醇酯（PPC - mb -PBS ）系列多嵌段共聚物) 被设计和合成。¹ H-NMR、DOSY 和 GPC 结果表明成功合成了具有设计多嵌段序列的 PPC- mb -PBS。这些 PPC - mb -PBS 的热、结晶和机械性能通过 DSC、TGA、POM、拉伸和撕裂测试进行评估。实验结果表明，PPC- mb的结晶度、热学和力学性能-通过改变 PPC 和 PBS 部分的组成和块长度可以很容易地调节 PBS。发现所有制备的 PPC - mb -PBS 都是半结晶聚合物，熔点_为93-109°C，Tg约为-40°C。多嵌段共聚物的结晶速率和结晶度都随着 PBS 含量和 PBS 嵌段长度的增加而增加。因此，在室温和较低温度下，拉伸强度随着 PBS/PPC 嵌段比的增加而增加。总之，嵌段共聚物中的无定形 PBS 相充当软链段，当 PPC 链段冷冻时，在 273 K 的低温下，赋予 PPC - mb -PBS 共聚物比 PPC 更好的柔韧性。

更新日期：2018-04-18

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11