反射型蓝色隔热节能涂层的制备及隔热性能

目的 针对目前广泛应用的传统型保温隔热建筑材料存在的施工困难、体系过厚、装饰性安全性较差等不足,制备力学性能和装饰性优异的隔热节能涂层。方法 使用KH560对硅溶胶进行改性,与苯丙乳液进行复合制备隔热节能涂料的成膜基料,加入质量分数分别为5%、10%、15%、20%的群青、钴蓝颜浆,制备8种隔热节能涂层。采用傅里叶红外变换光谱仪、马尔文Zeta电位仪、扫描电镜和热重分析仪分别对硅溶胶的接枝改性效果、粒径分布、微观形貌及热稳定性进行测试。采用扫描电镜、X射线衍射仪、电子探针分别对2种颜料的微观形貌、晶体特性和元素组成进行分析。采用紫外/可见/近红外分光光度计测试2种蓝色颜料和节能涂层的太阳光反射比和近红外反射比。采用红外热像仪对涂层试板隔热性能进行测试。采用多种涂层力学测试工具和扫描电镜分别对涂层的综合力学性能、微观形貌进行表征。结果 KH560对无机硅溶胶改性效果较好,可以显著降低硅溶胶的团聚,提升硅溶胶的热稳定性及其在有机乳液的分散性。群青和钴蓝颜料的添加量为5%时,2种涂层的节能隔热效果达到最优。添加量为5%群青的涂层的太阳光反射比、近红外反射比分别为0.462、0.533,添加量...     

Effects of nitrogen fertilization on synthesis of primary and secondary metabolites in three varieties of kacip fatimah (labisia pumila blume)

A split plot 3 by 4 experiment was designed to examine the impact of 15-week variable levels of nitrogen fertilization (0, 90, 180 and 270 kg N/ha) on the characteristics of total flavonoids (TF), total phenolics (TP), total non structurable carbohydrate (TNC), net assimilation rate, leaf chlorophyll content, carbon to nitrogen ratio (C/N), phenyl alanine lyase activity (PAL) and protein content, and their relationships, in three varieties of Labisia pumila Blume (alata, pumila and lanceolata). The treatment effects were solely contributed by nitrogen application; there was neither varietal nor interaction effect observed. As nitrogen levels increased from 0 to 270 kg N/ha, the production of TNC was found to decrease steadily. Production of TF and TP reached their peaks under 0 followed by 90, 180 and 270 kg N/ha treatment. However, net assimilation rate was enhanced as nitrogen fertilization increased from 0 to 270 kg N/ha. The increase in production of TP and TF under low nitrogen levels (0 and 90 kg N/ha) was found to be correlated with enhanced PAL activity. The enhancement in PAL activity was followed by reduction in production of soluble protein under low nitrogen fertilization indicating more availability of amino acid phenyl alanine (phe) under low nitrogen content that stimulate the production of carbon based secondary metabolites (CBSM). The latter was manifested by high C/N ratio in L. pumila plants.     

有机硅技术在涂装领域的应用

对有机硅技术在现代涂料与涂装领域的应用情况作了简要介绍,说明有机硅技术对涂装技术发展的重要意义。     

苯甲酸苯酯合成方法研究

通过两种方法合成了苯甲酸苯酯,用苯甲酸与苯酚在三氯化磷的作用下合成苯甲酸苯酯,产率：90％;用苯甲酸与苯酚在多聚磷酸的催化作用下合成苯甲酸苯酯,产率：85％。两种方法比较：用三氯化磷反应,产品质量好,产率高;用PPA作催化剂反应,污染小,后处理简单,产率较高。     

新型UV固化P／Si协同阻燃EA涂层的制备与性能研究

为了提高uv固化环氧丙烯酸酯（EA）涂层的阻燃性能,并保持其良好的力学及光学性能,将丙烯酸羟乙酯（HEA）分别与KH-5707LPzOs反应合成新型含Si／P功能单体,并将其掺杂于EA中,制备了uV固化新型含P／Si协同阻燃EA透明涂层。利用红外光谱仪、紫外／可见光谱仪、热重及涂层力学测试仪等研究了涂层的性能。     

冷轧钢表面氨丙基甲基二乙氧基硅烷膜的制备及其耐蚀性能研究

采用正交实验法设计多种氨丙基甲基二乙氧基硅烷的水解工艺条件,在冷轧钢表面制备硅烷膜,通过对比每种条件所得硅烷膜样品在3.50%NaCl溶液中的塔菲尔极化曲线,获得了最佳水解工艺,并用稳态极化曲线和扫描电子显微镜,研究了该工艺制备的硅烷膜对冷轧钢耐蚀性能的影响.研究表明:硅烷、乙醇、去离子水的体积比2:10:88,水解温...     

Telechelic polymers by living and controlled/living polymerization methods

Telechelic polymers, defined as macromolecules that contain two reactive end groups, are used as cross-linkers, chain extenders, and important building blocks for various macromolecular structures, including block and graft copolymers, star, hyperbranched or dendritic polymers. This review article describes the general techniques for the preparation of telechelic polymers by living and controlled/living polymerization methods; namely atom transfer radical polymerization, nitroxide mediated radical polymerization, reversible addition-fragmentation chain transfer polymerization, iniferters, iodine transfer polymerization, cobalt mediated radical polymerization, organotellurium-, organostibine-, organobismuthine-mediated living radical polymerization, living anionic polymerization, living cationic polymerization, and ring opening metathesis polymerization. The efficient click reactions for the synthesis of telechelic polymers are also presented.     

Effective surface treatments for enhancing the thermal conductivity of BN‐filled epoxy composite

To improve the thermal conductivity of BN‐filled epoxy composite, admicellar polymerization was used to coat polystyrene and polymethyl methacrylate on the BN surface to improve the interfacial adhesion in the composite. The treated surface was characterized by FTIR and contact angle measurements. The results show that the admicellar treatment led to improved wettability of epoxy resin on the treated surface. Thermal conductivity of the composite increased from 1.5 W/mK for untreated BN to 2.69 W/mK when the admicellar‐treated BN was used, indicating improvement in the interfacial adhesion between BN and epoxy resin in the composite. The mechanical properties of the composite also improved significantly. The surfactant : monomer molar ratio of 1 : 10 was found to be the optimum condition for the admicellar polymerization process. The solubility parameter concept was used to explain the difference in the effectiveness of polystyrene and polymethyl methacrylate. When compared to the more conventional silane treatment, admicellar treatment was found to be more effective in improving the interfacial adhesion between the BN particles and epoxy resin. SEM micrographs of the fractured surface of the composite further confirm the improvement in the interfacial adhesion after the admicellar treatment. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

邻甲酚醛环氧/改性凹凸棒土复合材料的制备

采用硅烷偶联剂KH560对提纯后的凹凸棒土(AT)进行改性,得到有机化凹凸棒土,并对其进行FTIR和TG表征,结果表明,KH560对凹凸棒土起到了良好的修饰改性作用。采用熔融复合法制备了AT质量分数为0～5%的邻甲酚醛环氧/凹凸棒土纳米复合材料(ECN/(KH560-AT)x),对其进行了扫描电镜(SEM)分析、动态力学分析(DMA)和热重分析以及力学性能测试。结果表明,KH560-AT的加入使复合材料断裂由脆性断裂向韧性断裂转变。ECN/KH560-AT复合材料的拉伸强度、冲击强度和Tg可比纯ECN分别高出54.12%、78.95%和37.5℃,KH560-AT的加入明显提高了复合材料的力学性能和耐热性。     

环氧/氢氧化铝复合材料性能研究

采用水解的KH-560处理微米级Al(OH)3粉末,改善其与树脂基体的表面相容性。通过FTIR对处理后的Al(OH)3进行了表征。优化了偶联剂水解条件及用量,并对不同Al(OH)3填充量的环氧/氢氧化铝复合材料分别采用热常数分析仪及电子万能试验机测试了其热导率和力学性能。结果表明,最佳水解条件为8%的KH-560在pH=4.5溶液中室温水解40 min。当KH-560的质量分数为Al(OH)3的10%左右时,效果最优。材料的热导率随着Al(OH)3填充量的增加而增高。填充量为6%时,力学性能达到最优。