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Bapan Adak 《纺织学会志》2017,108(6):1010-1017
In this work, all-cellulose composite (ACC) laminates were manufactured from lyocell fabric using a simple hand lay-up and compression molding-based surface-selective dissolution technique. In dissolution step, temperature and dissolution time were fixed and pressure varied. Subsequently, the dissolved cellulose was regenerated via solvent exchange and then dried by hot-pressing. The microstructures of ACC laminates were analyzed by scanning electron microscope micrographs and measuring void content. Optimum microstructure and mechanical properties were obtained with a pressure of 1 MPa, but slightly deteriorated with further increase in pressure. The highest tensile strength and modulus achieved were 44.24 ± 2.2 MPa and 1.78 ± 0.14 GPa, respectively, for ACC-3. Best flexural strength and modulus obtained were 48.95 ± 2.87 MPa and 0.96 ± 0.21 GPa, respectively, for the same sample. The T-peel strength of ACC-3 also was very high, 2.78 ± 0.34 MPa. Application of pressure during drying had a great role on controlling shrinkage and internal voids in ACC laminates.  相似文献
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This work was concerned with the development of polyurethane (PU) composites reinforced with cellulose fibers attained from sugarcane straw. For the obtainment of cellulose, sugarcane straw was pretreated and delignified. For the production of the PU, the polyol (castor oil) to diisocyanate mass ratio was 1.5:1.0. Reinforcement of the matrix was done, changing the concentration of cellulose fibers (5%, 10%, 15%, and 20% w/w). The efficiency on the obtainment of cellulose fibers was verified by chemical characterization and the fibers morphological aspects by scanning electron microscopy. The influence of fibers content in the composites was studied by thermal analyses, tensile and moisture absorption tests.  相似文献
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以漂白硫酸盐针叶木浆为原料制备不同直径的阳离子化微纤化纤维素(C-MFC),并将C-MFC喷涂在单层柴油滤纸原纸(基纸)表面得到复合柴油滤纸原纸(复合原纸);通过扫描电子显微镜(SEM)分析其表面形貌,实验分析不同直径C-MFC对复合原纸孔隙特性、强度、透气度及紧度等性能的影响。结果表明,随着均质压力从10 MPa增加到70 MPa时,C-MFC的平均直径从154.5 nm降至68.3 nm;复合原纸的平均孔径由空白样的21.3 μm逐渐降低至14.1 μm,最大孔径由64.2 μm逐渐降低至38.0 μm,且孔径分布更加均一;喷涂C-MFC显著改善基纸的强度性能,在均质压力70 MPa条件下获得的C-MFC用于复合原纸制备,其抗张指数和耐破指数相比于空白样分别提高了61.2%和124.6%。  相似文献
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介绍功能性石墨烯与再生纤维素复合纤维的制备工艺,并对该纤维的形态结构及功能特点进行分析。结果表明:石墨烯与再生纤维素复合纤维的形态与普通纤维素纤维形态类似,石墨烯在纤维中均匀分散;当石墨烯含量达到3%以上时,石墨烯与再生纤维素复合纤维可达到相关国家标准中要求的防紫外线指标;石墨烯与再生纤维素复合纤维比普通纤维素纤维具有更好的热稳定性能。同时指出,功能性石墨烯与再生纤维素复合纤维具有良好的可纺性,既可纯纺,也可混纺交织,适合纺制各类梭织、针织纱,具有广阔的市场前景。  相似文献
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