CPE改性SBS接枝胶粘剂的研制

研究了CPE、SBS与MMA在甲苯、丁酮混合溶剂中的三元接枝共聚反应,并用红外光谱和扫描电镜对接枝产物进行了表征。结果表明,在SBS接枝体系中引入不超过骨架聚合物(SBS+CPE)总量25%的CPE,可提高所制胶粘剂对PVC人造革的粘合性能。     

大型稀疏连续体结构的多目标拓扑优化设计

基于变密度法和数学规划中的序列凸规划优化方法,建立了具有大型稀疏特点的连续体结构的多目标拓扑优化设计模型.以结构的静力学多刚度和动力学特征值问题同时作为优化的目标函数,以设计域中可容许材料的体积百分比作为优化的全局性约束来限制搜索域,用序列凸规划方法中的移动渐近线方法(MMA)作为优化数学模型的求解器.基于Matlab平台,用程序实现了MMA算法,并用典型算例证明了本文研究方法的有效性.     

Study of key algorithms in topology optimization

The theory of topology optimization based on the solid isotropic material with penalization model (SIMP) method is thoroughly analyzed in this paper. In order to solve complicated topology optimization problems, a hybrid solution algorithm based on the method of moving asymptotes (MMA) approach and the globally convergent version of the method of moving asymptotes (GCMMA) approach is proposed. The numerical instability, which always leads to a non-manufacturing result in topology optimization, is analyzed, along with current methods to control it. To eliminate the numerical instability of topology results, a convolution integral factor method is introduced. Meanwhile, an iteration procedure based on the hybrid solution algorithm and a method to eliminate numerical instability are developed. The proposed algorithms are verified with illustrative examples. The effect and function of the hybrid solution algorithm and the convolution radius in optimization are also discussed.     

甲基丙烯酸甲酯生产工艺及国内外发展现状

文章对目前世界上甲基丙烯酸甲酯的几种主要生产工艺进行了总结和归纳,并对近些年来,各甲基丙烯酸甲酯合成工艺的发展和新成果做了介绍,分析其优劣性.分析了国内外其生产现状,并提出了国内发展和生产该产品的合理化建议.     

一种PMMA表面改性的热压键合方法研究

介绍了一种基于表面改性技术的PMMA热压键合新方法。PMMA表面首先用其单体MMA进行改性，然后在真空热压设备中热压键合。主要的键合参数如下：键合压力0．5MPa～2．5MPa，温度88℃～100℃，时间180s。通过拉力法测量了键合强度，其最大值可达到0．15MPa。实验结果表明，与常规的热压键合方法相比，该方法可有效地降低键合温度，减少键合时间，提高键合强度，从而可减少对PMMA基片上微细图形结构的破坏。使用聚合物的单体（MMA）对PMMA进行改性，可避免对微管道产生化学污染，有利于集成毛细管电泳的生化分析。利用品红和氢氧化钠混合溶液对键合后的微流体芯片进行密封性测试，结果表明，封装后的微流体芯片没有出现泄漏的情况。     

硅铝氧烷溶胶复合PMMA增强NBR

用２－甲基丙烯酸与硅酸钠，硝酸名反应，制得硅铝氧溶胶，。在该溶胶存在下进行甲基丙烯酸甲酯无皂乳液聚合，蜊硅铝氧烷溶胶复合聚甲基丙烯酸甲酯填充到丁腈橡胶中，其硫化胶性能与填充硅铝氧溶胶者相比，拉伸强度有明显提高，硫化促进作用也很明显。从拉伸断裂面的ＳＥＭ照片可以看出前者呈韧性裂，而后者为脆性断裂。     

基于双向加速度传感器MMA6260的倾角仪

为克服现有光学象限仪精度低、防震性差、操作费时的缺点，满足对大型设备水平倾角快速精确测量的要求，设计了基于双向加速度传感器MMA6260数字化双轴倾角测量仪。该测试仪具有功耗低、电路简单、灵敏度高、性能稳定的优点，满足实际使用需要。     

Modeling and experimental studies of methyl methacrylate polymerization in a tubular reactor☆

In this study, rheological examination of the mixture of a tubular reactor in which methyl methacrylate was po-lymerized has been studied. The n (flow behavior index) value of Power Law Model of mixture contained in the reactor has been determined within the span of 0.3492 to 0.9889 by curve fitting. Employing these numerical data for velocity profile, the reactor has been modeled. Moreover, the functions of the reactor have been com-pared in the three modes of plug, mixed and laminar flow. The results obtained in this research indicate that the polymethyl methacrylate mixture contained in the reactor is pseudo-plastic. Moreover, as the conversion grows, the velocity profile starts as a parabolic profile and approaches the plug mode;although it never reaches the plug. The other conclusions borne in this study indicate that when the reactor's radius is decreased, the conversion rate grows. However, as decreasing the radius would also reduce the productions rate, this procedure is not economical. Finally, in this modeling, the amount of conversion is equal to 56.47%at the end and according to its laboratory proportion which is 55.88%, it has reached the conclusion that the modeling duly undertaken is applicable and valid.     

甲基丙烯酸甲酯产品行业发展策略

介绍甲基丙烯酸甲酯产品行业的发展情况,对其国内国外市场发展进行分析,结合国内行业发展,提出在发展布局、供应能力、企业管控、产品规划方面的建议。     

甲基丙烯酸甲酯的生产与消费

分析世界甲基丙烯酸甲酯的供需关系,预测2011--2015年全球需求量年增长速度3．8％。统计国内的甲基丙烯酸甲酯的生产能力、产量、进出口量,分析了消费结构,提出了发展建议。