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“Reinforcing capability of cellulose nanocrystals obtained from pine cones in a biodegradable poly(3-hydroxybutyrate)/poly(ε-caprolactone) (PHB/PCL) thermoplastic blend”
European Polymer Journal ( IF 6 ) Pub Date : 2018-04-26
Daniel Garcia-Garcia, Juan Lopez-Martinez, Rafael Balart, Emma Strömberg, Rosana Moriana

In this work, different loads (3, 5 and 7 wt%) of pine cone cellulose nanocrystals (CNCs) were added to films of poly(3-hydroxybutyrate)/poly(ε-caprolactone) (PHB/PCL) blends with a composition of 75 wt% PHB and 25 wt% PCL (PHB75/PCL25). The films were obtained after solvent casting followed by melt compounding in an extruder and finally subjected to a thermocompression process. The influence of different CNCs loadings on the mechanical, thermal, optical, wettability and disintegration in controlled compost properties of the PHB75/PCL25 blend was discussed. Field emission scanning electron microscopy (FESEM) revealed the best dispersion of CNCs on the polymeric matrix was at a load of 3 wt%. Over this loading, CNCs aggregates were formed enhancing the films fragilization due to stress concentration phenomena. However, the addition of CNCs improved the optical properties of the PHB75/PCL25 films by increasing their transparency and accelerated the film disintegration in controlled soil conditions. In general, the blend with 3 wt% CNCs offers the best balanced properties in terms of mechanical, thermal, optical and wettability.



中文翻译:

“从松果中获得的纤维素纳米晶体在可生物降解的聚(3-羟基丁酸酯)/聚(ε-己内酯)(PHB / PCL)热塑性共混物中的增强能力”

在这项工作中,将不同负载量(3、5和7重量%)的松锥纤维素纳米晶体(CNC)添加到具有组成的聚(3-羟基丁酸酯)/聚(ε-己内酯)(PHB / PCL)共混物的薄膜中75重量%的PHB和25重量%的PCL(PHB 75 / PCL 25)。在溶剂流延之后,在挤出机中熔融配混,并最终进行热压工艺,从而获得膜。不同CNC负载对PHB 75 / PCL 25受控堆肥性能的机械,热,光学,润湿性和崩解的影响讨论了混合。场发射扫描电子显微镜(FESEM)显示,CNC在聚合物基质上的最佳分散度为3 wt%。在此载荷下,由于应力集中现象,形成了CNCs聚集体,从而增强了薄膜的脆化性。但是,添加CNC控制器可以提高PHB 75 / PCL 25薄膜的透明度,并可以在受控的土壤条件下加速薄膜的崩解,从而改善了薄膜的光学性能。通常,具有3 wt%CNC含量的共混物在机械,热,光学和润湿性方面提供最佳的平衡性能。

更新日期:2018-04-27
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