Impact modified PLA-hydroxyapatite composites - Thermo-mechanical properties
Impact modified PLA-hydroxyapatite composites - Thermo-mechanical properties
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DOI：
10.1016/j.compositesa.2018.01.017
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发表时间：
2018-04-01
影响因子：
8.7
通讯作者：
Feldmann, Maik
中科院分区：
文献类型：
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作者：
Akindoyo, John O.;Beg, Mohammad D. H.;Feldmann, Maik
由聚乳酸(PLA)和羟基磷灰石(HA)组成的协同复合材料具有很大的承载应用潜力。在本研究中，通过挤出法制备了聚乳酸-羟基磷灰石复合材料，然后通过注射成型制备了试件。通过加入不同用量(0~15wt%)的Biomaxa(R)Strong 120(BS)抗冲改性剂，改善了复合材料的冲击性能。研究了复合材料的力学性能、热性能、形态性能和动态力学性能。用傅立叶变换红外光谱研究了共混过程中的化学作用。BS的加入降低了聚乳酸-羟基磷灰石界面的结晶活性，但随着BS含量的增加，结晶温度右移。随着BS含量的增加，聚乳酸-羟基磷灰石复合材料的力学性能降低。但冲击强度(78%)和断裂伸长率(206%)有明显提高。当BS含量为5wt%时，复合材料的各项性能达到最佳折衷。
Synergistic composites from poly(lactic acid) (PLA) and hydroxyapatite (HA) hold great potential for load bearing applications. In this study, PLA-HA composites were produced through extrusion, and test specimens were subsequently prepared through injection molding. Impact properties of the composite was improved by incorporating different amount (0 to 15 wt%) of Biomaxa (R) Strong 120 (BS) impact modifier. The mechanical, thermal, morphological and dynamic mechanical properties of the resulting composite were investigated. Likewise, chemical interactions during blending were investigated through Fourier transforms infrared spectroscopy. Incorporation of BS decreased the crystallization activities at the PLA-HA interface, but with a right shift in crystallization temperature as the BS content increases. Also with increasing BS content, mechanical properties of the PLA-HA composite were reduced. However there is an obvious increment in impact strength (78%) and elongation at break (206%). The composite containing 5 wt% BS content presents the best compromise among the investigated properties.