Öner Mualla, Kızıl Gülnur, Keskin Gülşah, Pochat-Bohatier Celine, Bechelany Mikhael
Chemical Engineering Department, Chemical-Metallurgical Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
Institut Européen des Membranes, IEM UMR-5635, ENCSM, CNRS, Université de Montpellier, ENSCM, CNRS, Place Eugéne Bataillon, 34000 Montpellier, France.
Nanomaterials (Basel). 2018 Nov 15;8(11):940. doi: 10.3390/nano8110940.
The thermal and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) composites filled with boron nitride (BN) particles with two different sizes and shapes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA) and mechanical testing. The biocomposites were produced by melt extrusion of PHBV with untreated BN and surface-treated BN particles. Thermogravimetric analysis (TGA) showed that the thermal stability of the composites was higher than that of neat PHBV while the effect of the different shapes and sizes of the particles on the thermal stability was insignificant. DSC analysis showed that the crystallinity of the PHBV was not affected significantly by the change in filler concentration and the type of the BN nanoparticle but decreasing of the crystallinity of PHBV/BN composites was observed at higher loadings. BN particles treated with silane coupling agent yielded nanocomposites characterized by good mechanical performance. The results demonstrate that mechanical properties of the composites were found to increase more for the silanized flake type BN (OSFBN) compared to silanized hexagonal disk type BN (OSBN). The highest Young's modulus was obtained for the nanocomposite sample containing 1 wt.% OSFBN, for which increase of Young's modulus up to 19% was observed in comparison to the neat PHBV. The Halpin⁻Tsai and Hui⁻Shia models were used to evaluate the effect of reinforcement by BN particles on the elastic modulus of the composites. Micromechanical models for initial composite stiffness showed good correlation with experimental values.
通过扫描电子显微镜（SEM）、差示扫描量热法（DSC）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）和力学测试，研究了填充有两种不同尺寸和形状的氮化硼（BN）颗粒的聚（3-羟基丁酸酯-co-3-羟基戊酸酯，PHBV）复合材料的热性能和力学性能。生物复合材料是通过将PHBV与未处理的BN和表面处理的BN颗粒进行熔融挤出制备的。热重分析（TGA）表明，复合材料的热稳定性高于纯PHBV，而颗粒的不同形状和尺寸对热稳定性的影响不显著。DSC分析表明，PHBV的结晶度不受填料浓度变化和BN纳米颗粒类型的显著影响，但在较高负载量下观察到PHBV/BN复合材料的结晶度降低。用硅烷偶联剂处理的BN颗粒产生了具有良好力学性能特征的纳米复合材料。结果表明，与硅烷化六方盘状BN（OSBN）相比，硅烷化片状BN（OSFBN）的复合材料力学性能增加更多。对于含有1 wt.% OSFBN的纳米复合材料样品，获得了最高的杨氏模量，与纯PHBV相比，其杨氏模量提高了19%。使用Halpin⁻Tsai和Hui⁻Shia模型评估BN颗粒增强对复合材料弹性模量的影响。初始复合材料刚度的微观力学模型与实验值显示出良好的相关性。
