Crystallization behavior and mechanical properties of crosslinked plasticized poly(L‐lactic acid)
Crystallization behavior and mechanical properties of crosslinked plasticized poly(L‐lactic acid)
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DOI：
10.1002/app.29171
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发表时间：
2009-02
影响因子：
3
通讯作者：
Zhiyuan Jia;Kunyu Zhang;Juanjuan Tan;Changyu Han;Li-song Dong;Yuming Yang
中科院分区：
文献类型：
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作者：
Zhiyuan Jia;Kunyu Zhang;Juanjuan Tan;Changyu Han;Li-song Dong;Yuming Yang
用聚乙二醇（PEG）增塑聚L-乳酸（PLLA）以提高其稳定性是其实际应用的必要条件。在本研究中，增塑的PLLA（PLLA/PEG 80/20 wt/wt）在异氰脲酸三烯丙酯（TALC）作为交联剂的存在下在I-射线（Co-60）下交联。FTIR分析表明PLLA、PEG和TALC形成了共交联结构。通过差示扫描量热法（DSC）、广角X射线衍射（WAXD）、扫描电镜（SEM）和拉伸试验研究了交联增塑PLLA的结晶行为和力学性能。实验结果表明，共混物中PEG和PLLA的结晶行为在辐照后均受到抑制。当辐照剂量较低时（约10 kGy），结晶样品中PEG的熔融峰消失。虽然PLLA仍具有结晶行为，但其冷结晶温度和玻璃化转变温度向高温移动。通过交联，增塑PLLA的力学性能得到增强。交联后样品的屈服强度和弹性模量均有所提高。
Enhancing the stability of plasticized poly(L-lactic acid) (PLLA) with poly (ethylene glycol) (PEG) is necessary for its practical application. In this study, plasticized PLLA (PLLA/PEG 80/20 wt/wt) was crosslinked under I-ray (Co-60) in the presence of triallyl isocyanurate (TALC) as crosslinking agent. FTIR analysis revealed that PLLA, PEG, and TALC formed a cocrosslinking structure. Crystallization behavior and mechanical properties of the crosslinked plasticized PLLA were investigated by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and tensile tests. Experimental results indicated that the crystallization behaviors of both PEG and PLLA in the blends were restrained after irradiation. The melting peak of PEG in the crystallized samples disappeared at a low irradiation doses about 10 kGy. Although PLLA still owned the behavior of crystallize, its cold crystallization temperature and glass transition temperature shifted to higher temperature. Mechanical properties of the plasticized PLLA were strengthened through crosslinking. Both yield strength and elastic modulus of the samples increased after crosslinking.