Effects of Some Additives on the Adhesion of Polyacrylamide Sizes to Fibers

IntroductionPolyacrylamide ( PAM) size is one of the sizeingredients that are commonly used in conventionalfor mulations for warp sizing and paper making .It has theproperties of adhering to fibers and can be capable ofholding fiber together by surface attachment . Comparedwith starches and polyvinyl alcohols , PAM possesses suchcapability as excellent adhesion to cellulose fibers . Thiscapability ,however ,is not due to chemical valence ;but isdeveloped only through hydrogen bonds and Van …     

Research on Flax Fiber Reinforced Polylactide Environmental Friendly Composite

Biodegradable polylactide acid （PLA） resin can be combined with flax fibers to produce biodegradable composite materials. In our study, commercial PLA fibers were mixed with flax fibers by a non-woven method so as to make non- woven pre-forms, which can be generated into flax fiber reinforced PLA environmental friendly composites by heat pressing technology. The tensile, flexural and impact properties are tested in order to evaluate the basic physical properties of the composites, and the influenced factors listed as making technology of the pre-forms, weight ratio of flax fibers and heat pressing technology are discussed and optimized, which can be described as weight ratio of flax fibers and PLA fibers is 50/50, heating temperature, time and pressure are respectively 195℃, 20 rain and 12.5 Mpa. Preliminary results show that mechanical properties of the flax/PLA composites are quite promising compared with flax/PP composites in coclrnon commercial automotive use. Scanning electron microscope （SEM） is used to analyze the tensile specimen fracture surfaces, which shows voids and gaps occurring between flax fibers and PLA matrix and sign of fiber pull.out, the strength of flax/PLA interface can be further improved.     

Liquid Flow in Shaped Fiber Bundle

By computation and comparison of the critical spreading coefficient parameter, it was found that shaped fiber bundle is better for wetting. Liquid-air interface tension of liquid arising the shaped fiber bundle body is considered as one critical factor besides liquid viscosity, inertia force and liquid-fiber interface tension. Experimental result simulation demonstrated that the liquid-air interface tension is correlated with the geometric size of the liquid arising in body, Φ0 （x） and which is affected by the cross sectional shape of fiber and the radius of single fiber. The shaped fiber bundle model is/ntroduced to/nvestigate liquid flow in fiber assembly. The model is generated based on a random function for stochastic forming of fibers in bundle and it is necessary to combine this fundamental model with physical explanation for investigation of liquid flow in fiber assembly.     

医用纺织品的实际应用

介绍了医用纺织品的分类、医用纺织品所使用的新材料及其性能,并指出其替代旧材料的优越性。     

膜振动理论在纤维材料吸声性能研究中的应用

膜振动理论作为经典声学理论的基础已得到广泛的研究.作者在研究中发现,将膜振动理论的某些结论与毛细管吸声理论结合后,建立的薄纤维层(如织物、无纺布等)吸声理论方程不仅与实验结果吻合较好,而且可以较好的解释薄纤维层在作为护面材料或紧贴墙壁时吸声系数等于或接近于零,而作为窗帘或背后有空腔时却具有较好的吸声效果的这一长期未能解释的声学现象.     

新型药物释放材料褐藻酸盐纤维的制备研究

利用湿法纺丝钙离子交联的方法制备褐藻酸盐纤维,并将牛血清清蛋白包埋入纤维中,研究了制备条件对纤维性能的影响.用扫描电镜观察纤维的微观形貌;并测试了纤维的力学性能、溶胀性能;测定了蛋白质的包埋效率,以及蛋白质的释放速率.结果表明,湿法纺丝凝固浴的CaCl2浓度影响纤维的力学性能、溶胀性能及蛋白质的释放.     

CPP/α-TCP骨水泥复合材料研究

自固化磷酸钙骨水泥(CPC)作为一种新型人工骨替代材料，以其良好的生物相容性、骨传导性和可任意塑形，可广泛用于临床骨缺损修复．但其强度低、脆性大，不能用于负重部位，使其应用受到限制．本文利用纤维增强机理，用CPP／α-TCP骨水泥为基体材料，具有良好生物相容性的聚磷酸钙纤维(CPP)为增强材料制备出了CPP／α-TCP骨水泥复合材料．实验结果表明，CPP纤维在一定程度上可对骨水泥起到增强作用．SEM显示两者结合程度适中，在Ringer溶液中浸泡两个月后，纤维未发生明显降解作用，仍具有一定的增韧效果．     

用纤维素酶改善烟用醋酯纤维的表面性能

为了提高烟用醋酯纤维的降焦减害性能，采用纤维素酶对烟用醋酯纤维进行表面处理，通过水解达到醋酯纤维表面的改性，增加其比表面积，提高了吸附过滤性能。     

金属基复合材料的热膨胀

在过去几十年里，研究人员倾注了大量的精力来研究金属基复合材料，取得了很多的成果，热膨胀作为这类材料重要的、基本属性之一也得到了广泛深入的研究，本文主要论述了金属基复合材料的热膨胀研究现状，以及典型的金属基复合材料热膨胀系数模型，并预测了今后的发展方向。     

半稀相纤维悬浮剪切流有效黏度表达式的改进

由于现有的纤维悬浮剪切流有效黏度的理论公式在描述非稀相小长径比的纤维悬浮流时, 与试验结果存在偏差, 而且随着纤维长径比的减小, 两者的偏差增大. 通过对直径为20 mm的纤维的实验研究, 建立了描述小长径比半稀相纤维悬浮剪切流有效黏度的新表达式, 给出了有效剪切黏度与浓度的关系, 说明在小长径比半稀相纤维悬浮剪切中, 有效剪切黏度与浓度不再是线性关系.