Synthesis and kinetic studies of UV‐curable urethane‐acrylates

The UV‐curable urethane‐acrylates based on 2‐hydroxyethyl methacrylate (HEMA)‐terminated polyurethane (PU) for lithographic and coating applications are investigated in this study. Series of PU prepolymers were made from 4,4‐diphenyl methane diisocyanate (MDI), poly(propylene oxide) glycol (PPG 400), poly(butylene adipate)glycol (PBA 500), or poly(tetramethylene oxide) glycol (PTMO 1000) and are terminated with HEMA. The 2,2‐azobisisobutyronitrile (AIBN) was used as a UV‐initiator under air atmosphere. The curing kinetics of HEMA‐terminated PU film were studied. The curing analysis, using FTIR and reaction kinetics, indicate the reaction rate equation correlates well with the film thickness [T], initiator concentration [I], unreacted double bond concentration [C?C], and exposed energy [E] of the reaction system. The kinetic rate equation for the UV‐curable reaction can be written as © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3162–3166, 2004     

水性核（PMMA）／壳（PU）聚氨酯丙烯酸酯杂化乳液的合成研究

合成高Tg低成膜温度的水性聚氨酯丙烯酸酯杂化乳液,研究了合成工艺、—N CO和—O H的比例、丙烯酸酯含量等因素对乳液稳定性和其他性能的影响。     

Vernonia oil–based acrylate and methacrylate polymers and interpenetrating polymer networks with epoxy resins

Acrylate and methacrylate monomers were obtained by reacting vernonia oil, a naturally epoxidized oil, with acrylic or methacrylic acid. The highest conversion (85–98%) of epoxy groups was obtained when the reaction was performed with an excess of the carboxylic acid at 100–120°C. The acrylate and methacrylate monomers of vernonia oil were characterized by IR and NMR spectroscopy. These monomers were then cured by sunlight in the presence of benzophenone to produce transparent films. In addition, interpenetrating polymer neworks (IPNs) were prepared in a two‐step technique from the sunlight‐cured methacrylate of vernonia oil, as the elastomeric component, in combination with a cured epoxy resin (a bisphenol A–type resin). Dynamic mechanical analysis showed good compatibility between the networks of the two cured polymers. An IPN with a 1 : 1 composition of the two polymer components exhibited the properties of a reinforced elastomer. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3835–3843, 2004     

乳液型紫外光固化聚氨酯丙烯酸酯的涂膜性能及其影响因素

合成了一系列乳液型紫外光(UV)固化聚氨酯丙烯酸酯,针对其涂膜性能进行研究,考察了辐射时间、膜厚、光引发剂用量、分子结构等因素对涂膜性能的影响;通过对各种影响因素的研究,得到了具有优良的涂膜性能和装饰性的乳液型UV固化聚氨酯丙烯酸酯,附着力在0~1级,正反耐冲击性都在50 cm以上,铅笔硬度可以达到3H以上。     

有机-无机(硅溶胶)复合涂料的制备

有机-无机(硅溶胶)复合涂料，既具有硅溶胶耐候性好、硬度高、附着力强、耐水、耐碱、耐沾污等特点，又具有有机聚合物成膜性好、韧性大、光泽高等特点。本法选用江阴国联化工有限公司生产的交联改性的苯乙烯-丙烯酸酯乳液与硅溶胶通过物理混拼法，并辅以适当的颜填料、助剂制备的涂料，可作为外墙封闭型底漆用于水泥砂浆、混凝土等硅酸盐基材及用于外墙装饰。文章还述及制备工艺及注意事项。     

高吸水性树脂与PVC共混的研究

用高吸水性树脂与PVC共混制备了吸水膨胀性PVC共混物。实验证明,部分水解丙烯酸甲酯—醋酸乙烯酯HP(MA—VAC)和丙烯酸甲酯—醋酸乙烯酯—甲基丙烯酸甲酯HP(MA—VAC—MMA)共聚物与PVC共混效果更好。研究了影响共混物吸水率和力学性质的各种因素。结果表明,随高吸水性树脂用量增加,共混物吸水率显著增加。当吸水树脂用量大于40%时,共混物的拉伸强度和断裂仲长率下降。共混物最大吸水率达22.17克水/克共混物,最大膨胀度为15倍。     

积层多层板用UV油墨的合成研究

采用丙烯酸改性环氧树脂E－44的方法，合成了环氧丙烯酸酯预聚物，并将其用在UV光固化油墨的配方中。在树脂合成过程中，研究了反应温度，催化剂，阻聚剂等因素对合 产品的影响。通过L9(3^4)正交试验，得到了优化的工艺参数：反应温度为90℃，催化剂为N，N－二甲苯胺，用量1％；阻聚剂对苯二酚，用量0．5％，投料环氧树脂和丙烯酸的摩尔比为1：1．08。     

Synthesis and characterization of butyl acrylate graft sodium salt of partially carboxymethylated starch

Graft copolymers were synthesized by graft copolymerization of butyl acrylate (BA) onto sodium salt of partially carboxymethylated starch (Na‐PCMS). Ceric ammonium nitrate (CAN), a redox initiator, was used for initiation of graft copolymerization reaction. All the experiments were run with Na‐PCMS having degree of substitution, DS = 0.35. The grafting reaction was characterized by parameters such as % total conversion (%Ct), % grafting (%G), % grafting efficiency (%GE), and % add‐on. Graft copolymers were characterized by infrared spectral analysis and scanning electron microscopy. Variables affecting graft copolymerization reaction such as nitric acid concentration, reaction time, reaction temperature, and ceric ion concentration were investigated. The results revealed that 0.3M CAN as initiator, 0.3M HNO₃, with reaction time 4–4.5 h at 25–30°C were found as suitable parameters for maximum yield of graft copolymerization reaction. © 2006 Wiley Periodicals, Inc. JAppl Polym Sci 102: 3334–3340, 2006     

聚丙烯酸叔丁酯的可控合成

以偶氮二异丁腈(AIBN)为引发剂,1-苯乙基二硫代苯乙酸酯(PEPDTA)为RAFT试剂,在乙酸乙酯中实施了丙烯酸叔丁酯(tBA)的RAFT自由基聚合。分子量测试表明,在高转化率(93%)下P(tBA)的分子量分布指数(Mw/Mn)小于1.1,且数均分子量与转化率成良好的线性关系,体现了可控/"活性"聚合的特征。     

改性聚氨酯固色剂的固色工艺研究

采用了一种自制的丙烯酸酯改性聚氨酯固色剂,对活性染料染色后织物进行固色整理.通过对固色剂的用量、焙烘温度、焙烘时间和轧余率的探讨,确定了色织物的最佳固色整理工艺为：活性染料染色织物→二浸二轧（固色剂50g/L,轧余率75%）→烘干（70℃×3 min）→焙烘（150℃×3 min）.实验结果表明,此类固色剂对活性染料染色棉织物有良好的固色效果,可使织物的干湿摩擦牢度和水洗牢度有所提高.其固色效果与4种市售固色剂基本相当,固色后织物色光基本不变.