原位聚合法制备微胶囊过程中影响因素的研究

为在乳液体系中制备具有较好表面形貌、粒径分布均一的电泳显示用微胶囊,以尿素和甲醛为原料,采用原位聚合法制备出脲醛树脂微胶囊,并对乳化剂的用量、搅拌速度、酸性催化剂的种类以及滴加速度和乳液的pH值等因素对微胶囊的形成、形态和质量的影响进行了系统的研究.结果表明,分别采用0.039 g(0.66x10-3moI/L)的吐温80(Tween-80)和0.1 mol/L的盐酸作为乳化剂和酸性催化剂,搅拌速度在600-800 r/min,乳液体系的pH值为1.5时所制备胶囊的形貌质量最好.     

原位聚合法制备聚碳酸亚丙酯/蒙脱土纳米复合材料及其性能

通过原位聚合的方法制备了聚碳酸亚丙酯(PPC)/蒙脱土(MMT)复合材料.TEM分析表明蒙脱土片层是以纳米尺度分散在聚合物基体中,形成了纳米复合材料.热学和力学性能测试表明,与纯的PPC相比,含蒙脱土的聚合物纳米复合材料的热学和力学性能举得到明显改善,尤其是材料的拉伸强度得到大幅度提高.     

Preparation of nano-compounded polyolefin materials through in situ polymerization technique: status quo and future prospects

Nano-compounding of polyolefins, an economical yet very effective route to high-performance polyolefin materials, has received considerable attention in recent years. Unlike most of the other polymers, polyolefins are chemically inert, which dictates that nano-compounding of polyolefins has to be conducted via in situ polymerization. In this review, a technological progress of the nano-compounding of polyolefins via in situ polymerization technique was summarized thoroughly, with emphasis laid on the current research status of polyolefin/montmorillonite (MMT) nanocomposites. A clear perspective for future researches on this specific family of materials was envisaged. Supported by National Natural Science Foundation of China (Grant No. 50373048) and State Key Development Program of Basic Research Program of Ministry of Science and Technology of China (Grant No. G2003CB615600)     

Preparation and Application of Microencapsulated Disperse Dyes

Microcapsules containing disperse dyes were prepared by means of in-situ polymerization. Polyester fabrics were multiple-transfer printed and color-mix printed using those microencapsulated dyes under different process conditions. By color measurement instrument, it can be seen that the times of multiple-transfer printing are up to ten while under appropriate conditions, especially when the transfer printing time is 50 seconds and the transfer printing temperature is 180° C. On the other hand, the K/S value of each transfer printing can keep almost constant. Meanwhile, the visual effect of color-mix printing with microencapsulated disperse dyes is special in the varicolored exhibiting if compared with conventional disperse dyes.     

无桩靴夯扩桩在复杂地基中的应用

论述了无桩靴夯扩桩的成桩工艺及其独特优点,提出了无桩靴夯扩桩适用条件和设计计算原则。工程实例表明,无桩靴夯扩桩是一种技术性能可靠,社会、经济效益显著,值得广泛推广运用的新颖桩型。     

两亲接枝共聚物作乳化剂时丙烯酰胺分配系数的确定

以两亲接枝共聚物－－聚苯乙烯接枝聚氧乙烯（ＰＳ－ｇ－ＰＥＯ）和聚人酸甲酯接枝聚乙烯（ＰＭＭＡ－ｇ－ＰＥＯ）作为乳化剂,选用合适的方法测试了丙烯酰胺（ＡＭ）在胶束和液滴中的分配系数－考察了两亲支共聚物的浓度对分配系数的影响,结果表明：分配系数与两亲接枝共聚物的浓度成正比关系,ＰＳ－ｇ－ＰＥＯ作乳化剂时,ηＰＳ－ｇ－ＰＥＯ＋０．１７６ｃＥ＾０．９８５,而ＰＭＭＡ－ｇ－ＰＥＯ作乳化剂时,ηＰＭＭＡ－ｇ－     

多用途覆合薄膜粘合剂制备与性能研究

以丙烯酸丁酯（ＢＡ）、醋酸乙烯（ＶＡＣ）赤主要单体,采用乳液聚合法制备多用途覆合薄膜粘合剂,探讨了ＶＡＣ、改性单体、乳化剂及反应温度对粘合剂性能的影响,得出最佳的制备条件为：ＶＡＣ用量１５％;改性单体用量４％;乳化剂用量２％;反应温度７５￣８３℃;所得粘合剂的剥离强度高达２８Ｎ／２５ｍｍ。     

高浓乳液聚合法制备单分散聚苯乙烯胶乳反应机理研究

报道了用高浓乳液聚合法制备均分散聚苯乙烯胶乳 ,并用激光散射对胶乳粒子进行了表征 .在单体、表面活性剂和引发剂质量一定的情况下 ,改变水的量 ,我们发现所得粒子直径与单体的质量分数呈线性关系 ,单体质量分数越大 ,粒子越小 .并对聚合机理进行了探讨 .     

Synthesis of styrene and tetrahydrofuran block copolymers by in situ transformation

In order to transfer the halogen terminus of polymers for block copolymer synthesis, the in situ trans-formation of living free radical polymerization of styrene into living cationic ring-opening polymerization of tetrahydrofuran was successfully performed. Three different initiator/catalyst systems of styrene were employed, I.e. (a) PhCH2C1/Bpy/CuC1, (b) 1-PEBr/Bpy/CuC1 and (c) CCl4/BDE/CuC1 system. With these monofunctional initiator or difunction-al initiator, both AB and ABA type block copolymers of styrene and tetrahydrofuran were obtained using a silver salt with strong acid (AgC1O4) as the transformation agent in the transformation of polymerization type. Characterization of these copolymers by nuclear magnetic resonance hydrogen spectra (1H-NMR), gel permeation chromatography (GPC) and dif-ferential scanning calorimetry (DSC) indicated this method is simple and feasible.     

本体法环管式丙烯聚合过程建模和MFR预报

以Spheripol工艺环管聚丙烯反应器为研究对象,根据汽液平衡和聚合反应动力学方程,建立了丙烯聚合机理模型.采用了BWR状态方程结合亨利定律,计算环管内的汽液平衡,合理简化模型,提高了计算速度.利用现场工况数据,基于模型计算的聚丙烯的熔融指数较好地符合现场实测数据,说明了该模型的有效性.