P（St—HEMA）／PPrO共混体系浊化的膜厚效应

用自由基溶液聚合的方法合成了苯乙烯和甲基丙烯酸β－羟乙酯共聚物（Ｐ（Ｐｔ－ＨＥＭＡ），简称ＳＨ６）将其与聚环氧丙烷（ＰＰｒＯ，简称Ｎ３３０）共混，利用液浇铸法制备共混物薄膜，通过测定不同膜厚的ＳＨ６－Ｎ３３０共混体系的浊点，研究了薄膜厚度对ＳＨ６－Ｎ３３０共混体系浊化的影响，并利用逾渗机制建立了浊点值与薄膜厚度之间的定量关系，结果表明这一理论与实验数据相符合。     

甲基丙烯酸三氟乙酯与甲基丙烯酸异冰片酯共聚物的制备和性能

研究了甲基丙烯酸三氟乙酯(TFEMA)与甲基丙烯酸异冰片酯(IBDMA)在偶氮二异丁腈引发下的本体共聚合。重点研究了两种单体的竞聚率和不同单体组成制备得到的共聚物的性能。采用KT和FR两种作图法及YBR计算法对单体的竞聚率进行了计算和比较,结果表明,TFEMA与IBOMA的竞聚率分别为3.693和0.263。采用差示扫描量热法(DSC)、阿贝折光仪、紫外可见分光光度计分别测定了共聚物的玻璃化转变温度、折光指数和透光率。     

甲基丙烯酸甲酯与丙烯酸十六酯共聚物的制备及其吸油性研究

以甲基丙烯酸甲酯(MMA)和丙烯酸十六酯(HDA)为单体,N,N'-亚甲基双丙烯酰胺为交联剂,偶氮二异丁腈为引发剂,聚乙烯醇为分散剂,采用悬浮聚合法制得了高吸油性树脂.正交实验得最佳合成条件是:单体配比nHDA:nMMA=2:1,交联剂质量分数为1.00%,引发剂质量分数为1.20%,分散剂质量分数为0.15%,在此条件下制得的树脂吸油倍率为13.97 g·g-1.     

UV固化亲水涂料的制备及性能研究

在丙烯酸酯亲水树脂上引入光敏单体甲基丙烯酸缩水甘油酯（GMA）,使涂膜能常温固化且具有良好的亲水性和耐水性能。研究了引发剂和链转移剂摩尔分数对丙烯酸酯共聚物分子量、分子量分散度的影响,以及稀释剂、单体配比和GMA摩尔分数对涂膜亲水性和耐水性的影响。实验结果表明,当引发剂摩尔分数为1.2%,链转移剂摩尔分数为2%时,可制得分子量1300左右,分子量分散度185的丙烯酸酯共聚物;当GMA摩尔分数为15%（相对于AA物质的量）、稀释剂为丙烯酸羟丙酯（HPA）且质量分数为30%、AA与HPA的质量比为6∶4时,薄膜亲水和耐水的综合性能达到最佳,亲水角为14.2°,失重率为1.61%。     

Novel acrylic resin denture base with enhanced mechanical properties by the incorporation of PMMA-modified hydroxyapatite

A kind of novel acrylic resin denture base enhanced by PMMA-modified hydroxyapatite(M-HAP) was prepared and the modification effect of HAP on the mechanical properties of denture base material was investigated in the present study.HAP whiskers were prepared by hydrothermal homogeneous precipitation process and were silanized by the coupling agent,3-methacryloxy propyl trimethoxyl silane(γ-MPS),to induce the vinyl groups onto its surface.Methyl methacrylate(MMA) were then modified outside the vinyl functionalized HAP via polymerization to build a similar chemical structure with the acrylic matrix.A novel acrylic resin denture base was obtained through self-curing process with the incorporation of this PMMA-modified HAP,and the content of which ranged from 0wt% to 0.8wt%.Thermal gravimetric analysis(TGA),fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM),and universal testing apparatus were used to characterize M-HAP and corresponding denture base.The results showed that PMMA were successfully grafted onto the surface of HAP whiskers with up to 15wt% and the modification turned out to be useful for the dispersion and compatibility of whiskers in the acrylic resin matrix.The mechanical properties of the prepared denture base samples were enhanced greatly after incorporating with M-HAP fillers.The optimal incorporated content of M-HAP was also investigated.     

含氟聚氨酯的制备研究

以蓖麻油、甲苯-2,4-二异氰酸酯、甲基丙烯酸三氟乙酯(F3MA)、过氧化苯甲酰、N,N-二甲基苯胺为原料合成了含氟聚氨酯.采用红外光谱、X-射线光电子能谱(XPS)、原子力显微镜(AFM)、热失重曲线(TGA)及质量损失率曲线(DTG)等测试手段研究了含氟聚氨酯的结构与性能.研究结果表明:FPU表面氟含量为12.2 wt.%,远高于其本体含量(5.3 wt.%);随着含氟丙烯酸酯用量的增加,样品的拉伸强度和永久形变有所提高;当PF3MA含量为10.2 wt.%时起始分解温度较蓖麻油聚氨酯提高了近20℃.     

功能化PDMS／PMMA核壳乳胶粒子的制备与表征

采用预乳化-半连续种子乳液聚合工艺合成了聚硅氧烷,聚甲基丙烯酸甲酯（PDMS／PMMA）核壳乳胶粒子,通过引入功能单体ITA、MAH或GMA实现核壳乳胶粒子的功能化。采用激光粒度分析仪、傅立叶变换红外光谱仪（FTIR）和透射电子显微镜（TEM）等手段对核壳乳胶粒子进行了表征。     

Preparation and Characterization of Ester from Rosin Acrylic Acid Adduct and Hydroxyethyl Methacrylate

1 Results Rosin is a sort of important renewable resources,which is a foremost product of our country forestry. It has very important meaning to modify the rosin based on its molecule structure and active group, to develop some deep processing products, and to endure with rosin new characteristic[1]. This work uses the rosin and acrylic acid to form rosin adduct, and then reacted with 2-hydroxyethyl methacrylate (HEMA) to form ester under the different condition. The effect of different ratios with the ...     

VAc／MMA半连续无种子乳液共聚合数值模拟

建立了ＶＡｃ／ＭＭＡ半连续无各子乳液共聚合数学模型。通过数值模拟计算表明：ＶＡｃ／ＭＭＡ的成核以均相成核为主，与种子法比较，ＶＡｃ／ＭＭＡ无种子乳液共聚体系可选择相对较大的加料速率进行反应，而不致于导致反应末期的爆聚产生，另外，通过数值模拟考察了组分和操作参数对过程成核和反应动力学的影响。     

丙烯酸正丁酯和甲基丙烯酸正丁酯共聚合参数的测定

用^H-NMR法测定了丙烯酸正丁酯（NBA，M1）和甲基丙烯酸正丁酯（BMA，M2）的共聚物组成，用Mayo-Lewis模型的误差变量法（EVM）计算出不同温度下该体系本体聚合的竞聚率。并根据Arrhenius方程计算了该体系均聚、共聚反应频率因子之比Aii/Aij和活化能之差Eii-Eij。