Electroactive Shape Memory Effect of Polyurethane Composites Filled with Carbon Nanotubes and Conducting Polymer

We report the electroactive shape memory composites obtained by shape memory polyurethane block copolymer (PU) and multi-walled carbon nanotubes (MWNTs), and polypyrrole (PPy). An addition of combined MWNTs and PPy contributed to an enhancement in conductivity of PU-MWNTs composites. PU containing 2.5% MWNTs showed better mechanical and thermal properties than other composites, but conductivity was not sufficient for showing the shape memory effect by applying electrical voltages. However, when the composite was lightly coated by PPy (2.5%), its conductivity was the highest than other composites. Such the conductivity of this composite was enough to show electroactive shape recovery by heating above transition temperature of 40-48°C due to melting of polycaprolactone soft segment domain. The good shape recovery of 90-96% could be obtained in the shape recovery test when an electric field of 25 V was applied.     

Newly UV-curable polyurethane coatings prepared by multifunctional thiol- and ene-terminated polyurethane aqueous dispersions: Photopolymerization properties

A novel approach toward the preparation of newly UV-curable polyurethane coatings composed of multifunctional thiol- and ene-terminated polyurethane aqueous dispersions is presented. By a synergistic combination of polyurethane dispersions synthesis and thiol-ene chemistry, strategies for the preparation of newly UV-curable polyurethane coatings are developed. Photo-DSC, real-time FTIR, DMA and tensile tests measurements are used to investigate the photopolymerization and mechanical behaviors of newly UV-curable polyurethane coatings. The newly polyurethane coatings have 1.5 times higher polymerization rate and final 99% functional groups conversion in air conditions compared to current urethane-acrylate based UV-curable polyurethane dispersions coatings. UV-cured polyurethane films prepared by this method are also found to exhibit increase in Young's modulus and tensile strength at break by 25% and 10%, respectively. These experiment facts suggest that the incorporation of thiol-ene chemistry to the polyurethane dispersion coatings increase their polymerization rate, producing a high degree of cross-linking. This confirms the preparation of the targeted novel UV-curable polyurethane coatings and reveals the dramatic effect that changes in incorporation of thiol-ene chemistry can have on the photopolymerization behaviors of UV-curable polyurethane dispersions coatings systems.     

纯棉纬弹织物尺寸稳定性的控制

纯棉纬弹织物性能优异，但在染整加工过程中尺寸稳定性不易控制，造成成品门幅不稳定，甚至达不到客户要求，本文基于实验及生产实践，合理选择坯布密度及门幅，正确控制前处理工艺条件，灵活制订后处理工艺路线及工艺条件，既保证外观，弹性伸长率等性能符合要求，又获得满意的纬向尺寸稳定性。     

弹力机织物的结构参数对其保形性的影响

在对氨纶弹力机织物多项参数进行测试的基础上，采用多元线性回归方法，分析了织物结构参数与保形性的关系，研究结果表明：纱线氨纶含量对织物的保形性影响最大，其次为织经和织物紧度。     

丝素蛋白腈纶结构性能及其混纺针织纱的开发

通过对丝素蛋白接枝腈 性能及原理的讨论，提出了素蛋白腈纶纤维与天然纤维混纺针织纱及最终产品开发中的技术要点，为丝素蛋白接接腈纶的产品提供了途径。     

PU湿法半成品印刷压花取代干法贴膜

PU湿法半成品的后序加工步骤制PU革过程中，可以采用印刷压花工艺，成品质量和表现效果能够与干法贴膜加工所得的革相当，而且可以降低成本。     

降低双组分聚氨酯铺装材料异辛酸铅用量的研究

研究了催化剂对双组分聚氨酯铺装材料固化情况及对产品物理性能的影响。为了降低催化剂异辛酸铅的用量，对复合催化剂的配比和用量进行了选择性实验。实验结果表明，异辛酸锌与异辛酸铅复合催化剂适合本体系，其质量比对2:1宜。     

转杯纺纺制竹节纱的工艺研究

在改变喂给罗拉速度纺制竹节 的条件下，对转杯纺纺制竹节纱的基本工艺参数进行了理论研究，得到了关于粗节倍数和竹节长度的模型，并通过实验测试验证了理论的正确性，也证明了彩和改变喂给罗拉速度纺制竹节纱的可行性。     

快速脱模RIM弹性体的研制

采用自制的催化剂、改性ＭＤＩ、普通聚醚多元醇和扩链剂，通过设计特定的配方和强化工条件研制了能够在１ｍｉｎ内脱模的ＲＩＭ制品，探讨了影响脱模性的主要因素。