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可生物分解的纳米复合材料是新一代材料,微米和纳米级纤维素纤丝具有环保性和潜在的低密度及高强度,可用来制造能生物分解的纳米复合材料。为了描述用一种新的机械方法从Lyocell纤维中分离出的纤丝的特性,以及探索这种纤丝能否增强生物分解的聚合物,笔者用偏振光显微镜(PLM)和扫描电子显微镜(SEM)研究了纤丝的几何特性,用宽角X光衍射法(WAXD)分析了其结晶度,纤维的纤丝化程度用水分保持值(WRV)进行了评价;纤丝增强的聚乳酸(PLA)纳米生物复合材料由模压法制备,用拉伸试验来检测其力学强度,采用SEM来观察其断面特性。结果表明:纤丝提高了PLA的弹性模量和拉伸强度,但纤丝和聚合物基质之间的结合强度很弱。
Biodegradable nanocomposites are a new generation of materials. Micronized and nanoscale cellulose fibrils are environmentally friendly and potentially low density and high strength for the manufacture of biodegradable nanocomposites. In order to describe the characteristics of fibrils isolated from Lyocell fibers by a new mechanical method and to explore whether such filaments can enhance the biodegradability of polymers, the authors used polarization microscopy (PLM) and scanning electron microscopy (SEM) ) Was used to investigate the geometric properties of fibrils. The degree of crystallinity was analyzed by wide-angle X-ray diffraction (WAXD) and the degree of fibrillation of the fibers was evaluated by water retention (WRV). Fibril-reinforced polylactic acid (PLA) ) Nanocomposite material was prepared by compression molding, tensile strength was tested by tensile test, and SEM was used to observe its cross-sectional properties. The results show that the fibril increases the elastic modulus and tensile strength of PLA, but the bonding strength between the fibril and the polymer matrix is weak.