环保型反应性乳化剂在水性木器乳液聚合中的应用

介绍了环保型反应性乳化剂ADEKA?REASOAP?SR-10、ER-30的结构和特性,重点分析了反应性乳化剂在水性木器乳液聚合中的应用及其对聚合物性能的影响。实验证明,应用反应性乳化剂所得的聚合物性能要远远优于非反应性乳化剂所得聚合物性能,而且应用了非离子反应性乳化剂所得的聚合物性能要优于单独使用阴离子反应性乳化剂所得聚合物性能。最后预测了环保型反应性乳化剂的良好应用前景。     

改性丙-叔共聚乳液在天然石漆生产中的应用

以丙烯酸酯-叔碳酸乙烯酯共聚乳液为基料生产的天然石漆，具有形象逼真、不褪色、耐水耐碱性好、抗紫外线辐射性强等特点。     

VTMS对丙烯酸酯乳液的改性研究

研究了交联剂乙烯基三甲氧基硅烷（VTMS）对丙烯酸酯乳液聚合及乳液性能的改性作用。通过正交实验。得出合成弹性乳液的最优化条件：有机硅用量3％，引发剂用量0．5％，乳化剂用量4．8％，反应温度78℃。用激光粒度分析仪、红外光谱仪和差热分析仪对聚合物的形态及结构进行了表征。     

异氰酸酯改性光敏水性环氧丙烯酸酯的合成

以双酚A型环氧树脂与丙烯酸反应合成了具有羟基侧基的环氧丙烯酸酯，再用甲苯二异氰酸酯与内烯酸-β-羟乙酯的半加成物对上述环氧丙烯酸酯树脂进行接枝改性，再用酸酐引入羧基，经胺中和后，水性化．可得较为稳定的自乳化光敏树脂水分散体系。通过化学测试和IR解析．确定了合成条件、合成终点及产物结构，并以此为基料配成紫外光固化涂料，所得涂层性能优异。     

聚氨酯-聚丙烯酸酯复合乳液的动态力学性能

采用种子乳液聚合法合成了聚氨酯一聚丙烯酸乙（丁）酯[PU／PE（B）A]复合乳液。并研究了不同组成对复合乳液性质、相客性、阻尼性能及拉伸性能的影响。耐水性及稳定性测试表明，随PE（B）A含量的增加，涂膜的耐水性变好，而乳液的稳定性变差。动态力学性能测试（DMS）表明，合成的PU／PE（B）A复合乳液为半相容体系，其相容性随PE（B）A含量的增加而增强。DMS和拉伸试验表明PU／PEA／P（B）A（质量比50／25／25）复合乳液具有优良的阻尼性能、抗拉强度和断裂伸长率，可用作宽温域阻尼涂料。     

Different effects of tri(acryloyloxyethyl) phosphate on the thermal degradation of photopolymerized epoxy acrylate and polyurethane acrylate films

Tri(acryloyloxyethyl) phosphate (TAEP) was blended in different ratios with epoxy acrylate EB600 and polyurethane acrylate EB270 to obtain a series of UV curable flame retardant resins. The thermal degradation mechanisms of their cured films in air were studied by thermogravimetric analysis, in situ Fourier‐transform infrared spectroscopy, and direct pyrolysis/mass spectrometry measurements. The results showed that the phosphate group in TAEP first degraded to form poly(phosphoric acid) before the degradation of EB600. Then, the formed poly(phosphoric acid) effectively promoted the conversion of EB600 to form char, which prevented the sample from further burning. However, urethane group in EB270 degraded simultaneously with phosphate group in TAEP, leading to not effectively increase the conversion of EB270 to char during the thermal degradation. It was thus found that the addition of TAEP more effectively improved the thermal stability, flame retardance, and the char yield during combustion of EB600 than those of EB270. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3130–3137, 2006     

High solids content emulsions. III. Synthesis of concentrated latices by classic emulsion polymerization

Two different methods of producing bi‐ and trimodal latices of a mixture of methyl methacrylate, butyl acrylate, and small amounts of acrylic acid were tested. It is shown that a combination of concentrating blends of seed particles by semibatch reaction, followed by a nucleation of small particles plus a second semibatch phase allowed us to obtain stable latices with solids contents over 65% and viscosities of below 2500 mPa s^?1 with little coagulum formation. The key parameter in determining latex stability, coagulum formation, and viscosity appears to be the the particle size distribution, and especially its modification attributed to secondary nucleation. Because it is not possible to eliminate water‐soluble monomers from the polymerization recipe, secondary (homogeneous) nucleation must be minimized by careful addition of the free‐radical initiator and choice of monomer feed flow rates. The nucleation of the third population in the trimodal latices is best accomplished with a mixed surfactant system because renucleation by anionic surfactant alone leads to detrimental changes in the particle size distribution (PSD) resulting from excessive flocculation of particles. In addition, it was found that the viscosity of the final products was not sensitive to small changes in the ionic strength of the latex, although neutralization to a pH of 6 effectively doubles the final latex viscosity. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1916–1934, 2002; DOI 10.1002/app.10513     

原位聚合法研制纳米胶囊相变材料

采用超声波工艺及细乳液原位聚合方法,研制了以聚苯乙烯为囊壁、正十八烷为囊芯的纳米胶囊相变材料;系统探讨了聚合反应各因素如引发剂、链转移剂、表面活性剂以及正十八烷/苯乙烯比等对乳胶粒子的形态、胶囊材料热性能的影响,对所研制的胶囊相变材料进行激光衍射粒度分析、透射电镜及差示扫描量热等表征.实验结果表明,在引发剂AIBN 0.5%(油相质量百分比,下同);链转移荆DD在T0.4%;复合乳化剂(SDS/OP10)总量2%,配比1:1及正十八烷/苯乙烯比=1:1条件下,胶囊呈球形均匀分布,聚苯乙烯囊壁能将正十八烷囊芯很好包裹住,其胶囊Z均直径124nm,相变焓可达124.4kJ·kg-1.     

Continuous emulsion polymerization of vinyl acetate. II Operation in a single Couette–Taylor vortex flow reactor using sodium lauryl sulfate as emulsifier

Continuous emulsion polymerizations of vinyl acetate were conducted at 50°C in a single continuous Couette–Taylor vortex flow reactor (CCTVFR) using sodium lauryl sulfate as emulsifier and potassium persulfate as initiator. The polymerization can be carried out very smoothly and stably, but the steady‐state monomer conversion attained in a CCTVFR is not as high as that in a plug flow reactor (PFR), but only slightly higher than that in a continuous stirred tank reactor (CSTR), even if the Taylor number is adjusted to an optimum value. Also, the effects of operating variables, such as the emulsifier, initiator, and monomer concentrations in the feed and the mean residence time on the kinetic behaviors were almost the same as those observed in a CSTR. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2755–2762, 2002     

非离子型聚氨酯预聚体可聚合乳化剂的合成及性能

采用甲苯二异氰酸酯 (TDI) ,聚乙二醇 10 0 0 (PEG -10 0 0 ) ,丙烯酸为原料 ,通过分子设计合成了带有双键的非离子型可聚合乳化剂。并对其CMC值、流变行为及乳化力进行了表征。结果显示 :此乳化剂的CMC值在 6.0 %左右、浊点为 (54± 1)℃、HLB值为 16.1可以取代OP -10的乳化能力 ;该乳化剂可以与丙烯酸酯类单体进行乳液共聚 ,得到性能优异的共聚乳液