Morphological properties of impact fracture surfaces and essential work of fracture analysis of cellulose nanofibril-filled polypropylene composites
Morphological properties of impact fracture surfaces and essential work of fracture analysis of cellulose nanofibril-filled polypropylene composites
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纤维素纳米原纤填充聚丙烯复合材料冲击断裂面形貌特征及断裂分析基本工作
DOI：
10.1002/app.38513
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发表时间：
2013
影响因子：
3
通讯作者：
J. Nader
中科院分区：
文献类型：
--
作者：
Han;D. Gardner;J. Nader
采用扫描电镜（SEM）研究了纤维素纳米纤维（CNF）和微纤化纤维素（MFC）填充聚丙烯（PP）复合材料与微晶纤维素（MCC）填充复合材料的缺口和非缺口Izod冲击断口裂纹的起裂和扩展过程。CNF为直径50 ~ 300 nm、长径比6 ~ 8 nm的短纤维；MFC为直径50 ~ 500 nm、长径比8000 ~ 80000 nm的长原纤维；MCC为平均直径50 μm、长径比1 ~ 2 μm的颗粒。CNF和MFC的增强材料尺寸小于MCC，这意味着填料与基体之间的界面面积较大，导致冲击断裂时界面处的能量耗散较大。MCC颗粒附近的增强材料-基体的脱粘使得裂纹易于扩展，使得界面处的能量耗散较小。在断裂过程中观察到滑移行为和应力白化区。形态学研究有助于解释冲击断裂行为。根据Izod冲击结果的基本断裂功分析，EWF方法适用于冲击断裂行为分析，可以计算出断裂过程中裂纹萌生和扩展所消耗的能量。©2012 Wiley期刊公司j:。变异较大。科学。, 2013年
Scanning electron microscopy (SEM) was employed to investigate crack initiation and propagation process in notched and unnotched Izod impact fracture surfaces of the cellulose nanofiber (CNF) and microfibrillated cellulose (MFC)-filled polypropylene (PP) composites compared with microcrystalline cellulose (MCC)-filled composites. CNF is in the form of short fibers 50–300 nm in diameter and 6–8 in aspect ratio, MFC is in the form of long fibrils 50–500 nm in diameter and 8,000–80,000 in aspect ratio, and MCC is in the form of particles 50 μm in average diameter and 1–2 in aspect ratio. The reinforcement material size of CNF and MFC are smaller than that of MCC which means that the larger interfacial area between filler and matrix leading to larger energy dissipation at the interface during the impact fracture. The reinforcement-matrix debondings nearby MCC particles caused easy crack propagation which contributes smaller energy dissipation at the interface. A slip-stick behavior and stress whitened area during the fracture were observed. Morphological investigation helps to explain impact fracture behavior. According to essential work of fracture (EWF) analysis of Izod impact results, EWF method is applicable to analyze impact fracture behavior and the energy consumed in crack initiation and propagation during the fracture process can be calculated. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
影响因子：
6.2
作者：
Abe, Kentaro;Iwamoto, Shinichiro;Yano, Hiroyuki
通讯作者：
Yano, Hiroyuki