Long-Chain Branched Poly(lactic acid)-b-poly(lactide-co-caprolactone): Structure, Viscoelastic Behavior, and Triple-Shape Memory Effect as Smart Bone Fixation Material,Industrial & Engineering Chemistry Research

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Long-Chain Branched Poly(lactic acid)-b-poly(lactide-co-caprolactone): Structure, Viscoelastic Behavior, and Triple-Shape Memory Effect as Smart Bone Fixation Material
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-02 , DOI: 10.1021/acs.iecr.9b06514
Yalong Liu ₁ , Huijie Cao ₁ , Lin Ye ₁ , Phil Coates ₂ , Fin Caton-Rose ₂ , Xiaowen Zhao ₁

Affiliation

A novel fully biosbased poly(lactic acid)-b-poly(lactide-co-caprolactone) (PLA-b-PLCL) with a two-phase structure and long-chain branches was specifically designed and prepared through reactive melt processing. The results showed that PLCL segments were introduced onto PLA chains successfully. With the increase of PLCL content, the blockier distribution of LA/CL chain sequences of the sample was exhibited. PLA-b-PLCL showed two distinct thermal transitions, corresponding to the glass transition of PLA and PLCL domains, respectively, whereas the phase morphology changed from a sea-island to a co-continuous structure with increasing PLCL content. Because of the long-chain branched structure, PLA-b-PLCL samples showed a much higher viscoelasticity, strong molecular entanglement, and obvious strain-hardening behavior, resulting in a high draw ratio of the sample during orientation process, whereas the tensile strength and the modulus of the oriented sample reached up to 173 MPa and 5.4 GPa, respectively, which basically met the requirements of bone screws. Moreover, PLA-b-PLCL showed a triple-shape memory effect at 55 and 120 °C, respectively. For PLA-b-30 wt % PLCL, the recovery ratio can reach up to 98.1% under 55 °C, while high mechanical properties can be maintained, realizing self-reinforcement and self-fastening effect simultaneously as a smart bone fixation material.

中文翻译：

长支链聚（乳酸） - b -聚（丙交酯共己内酯）：结构，粘弹行为，以及三种形状记忆效应智能骨固定材料

一种新颖的完全biosbased聚（乳酸） - b -聚（丙交酯-共己内酯）（PLA- b -PLCL）具有两相结构和长支链是专门设计和通过反应熔融加工制备。结果表明，PLCL链段成功引入了PLA链。随着PLCL含量的增加，样品的LA / CL链序列呈现出较封闭的分布。PLA- b -PLCL表明两个不同的热转变，分别对应于PLA和PLCL结构域，的玻璃化转变，而相形态从海岛型改变为共连续结构随PLCL内容。由于长链分支结构，PLA- b-PLCL样品显示出更高的粘弹性，强分子缠结和明显的应变硬化行为，导致样品在取向过程中具有较高的拉伸比，而取向样品的拉伸强度和模量达到173 MPa和分别达到5.4 GPa，基本满足了骨螺钉的要求。此外，PLA- b -PLCL分别在55和120°C下显示出三重形状的记忆效应。对于PLA- b -30 wt％的PLCL，在55°C下的回收率可达到98.1％，同时可保持较高的机械性能，同时作为智能骨固定材料实现自我增强和自我固定效果。

更新日期：2020-03-03

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