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Morphology Thermo-Mechanical Properties and Biodegradibility of PCL/PLA Blends Reactively Compatibilized by Different Organic Peroxides

机译:通过不同的有机过氧化物反应性地相容的PCL / PLA共混物的形态学热机械性能和生物降解性

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摘要

Reactive blending is a promising approach for the sustainable development of bio-based polymer blends and composites, which currently is gaining more and more attention. In this paper, biodegradable blends based on poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) were prepared via reactive blending performed in an internal mixer. The PCL and PLA content varied in a ratio of 70/30 and 55/45. Reactive modification of PCL/PLA via liquid organic peroxides (OP) including 0.5 wt.% of tert-butyl cumyl peroxide (BU), 2,5-dimethyl-2,5-di-(tert-butylperoxy)-hexane (HX), and tert-butyl peroxybenzoate (PB) is reported. The materials were characterized by rotational rheometer, atomic force microscopy (AFM), thermogravimetry (TGA), differential scanning calorimetry (DSC), tensile tests and biodegradability tests. It was found that the application of peroxides improves the miscibility between PCL and PLA resulted in enhanced mechanical properties and more uniform morphology. Moreover, it was observed that the biodegradation rate of PCL/PLA blends reactively compatibilized was lower comparing to unmodified samples and strongly dependent on the blend ratio and peroxide structure. The presented results confirmed that reactive blending supported by organic peroxide is a promising approach for tailoring novel biodegradable polymeric systems with controllable biodegradation rates.
机译:反应混合是一种有望的方法,用于生物基聚合物共混物和复合材料的可持续发展,目前正在增加越来越多的关注。在本文中,通过在内部混合器中进行的反应混合制备基于聚(ε-己内酯)(PCL)和聚(乳酸)(PLA)的可生物降解的共混物。 PCL和PLA含量以70/30和55/45的比例变化。 PCL / PLA通过液体有机过氧化物(OP)的反应性改性,包括0.5重量%的叔丁基枯氧化氢(BU),2,5-二甲基-2,5-二(叔丁基氧基) - 己烷(HX)据报道,叔丁基丁基苯甲酸叔丁酯(PB)据报道。通过旋转流变仪,原子力显微镜(AFM),热重率(TGA),差示扫描量热法(DSC),拉伸试验和生物降解性试验的材料表征。发现过氧化物的应用提高了PCL和PLA之间的混合物,导致机械性能提高,更均匀的形态。此外,观察到,与未修饰的样品相比,反应性地相容的PCL / PLA共混物的生物降解速率较低,并强烈取决于混合比和过氧化物结构。所提出的结果证实,有机过氧化物支持的反应混合是一种具有可控生物降解率的新型可生物降解的聚合物体系的有希望的方法。

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