Influence of the amorphous phase molecular mobility on impact and tensile properties of polyamide 6,6

In this work, the relationship between molecular mobility of polyamide 6,6 amorphous phase and mechanical properties is studied. PA66 formulations having different glass transition temperatures (T_g) obtained by additivation, chemical modification of the polyamide chains, and/or water conditioning at different hygrometry levels, are considered. The main emphasis is put on the impact strength, as measured by instrumented Charpy impact tests over a broad temperature range. It is observed that the brittle‐tough transition temperature T_B/T is closely correlated with the T_g of the samples rather than to the β secondary relaxation. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43457.     

An Adaptive Pseudospectral Method for Constrained Dynamic Optimization Problems in Chemical Engineering

An adaptive pseudospectral method with two novel strategies is proposed to solve constrained dynamic optimization problems in chemical engineering. The first strategy is to introduce slope information in designing appropriate subintervals, so that the approach becomes more efficient to track the optimal control profiles. The second strategy is to redistribute the collocation points based on the approximation error, thus ensuring the accuracy of the method. Two constrained dynamic optimization problems with multiple control variables are tested as illustrations, and the proposed approach is compared with other methods. The research results reveal the effectiveness of the proposed method in improving the solution accuracy of dynamic optimization problems.     

浅谈煤粉锅炉干渣除渣系统设备选型

结合新疆南部某新建规模为2×130 t/h高温高压煤粉锅炉工程项目,为了选择合适的煤粉锅炉干渣除渣系统,比较了冷渣设备、输渣设备、渣库类型和装车卸料设备等,选择了风冷干渣机、斗式提升机输送、钢结构渣库和散装机装车卸料的干渣除渣方案,既节能环保,又技术可靠。     

铈硅包覆金红石型钛白粉及光催化性研究

采用溶胶-凝胶法,制备了铈硅包覆金红石型钛白粉,通过正交实验考察了浆液浓度、分散剂用量和两种包膜剂含量对铈硅包覆金红石型钛白粉性能的影响。采用Nano-ZS型粒度仪、扫描电镜（SEM）、透射电镜（TEM）和能谱（EDS）等测试手段,对金红石型钛白粉的Zeta电位、表面形貌和元素进行了表征。结果表明：在水浴温度为80 ℃左右、转速为600 r/min、浆液质量浓度为400 g/L、分散剂质量分数为0.1%、二氧化铈质量分数为3%、二氧化硅质量分数为4%的条件下,金红石型钛白粉表面包覆了两层均匀而致密的二氧化硅和二氧化铈膜;罗丹明B光催化降解实验证实,铈硅包覆明显改善了金红石型钛白粉的光催化屏蔽性。     

Synthesis of a polydimethylsiloxane-block-hydroxyl grafted acrylate prepolymer copolymer to improve the adhesion between silicone rubber and polyurethane by induced surface reconstruction

A new class of hydroxyl-functionalized polydimethylsiloxane-block-hydroxyl graft acrylate prepolymer (PDMS-b-HGAP) copolymers was synthesized. The copolymers were characterized using Fourier transform infrared spectroscopy as well as ¹H and ¹³C nuclear magnetic resonance spectroscopy. The hydroxyl groups of the HGAP were reacted with the chlorine terminal in the PDMS to yield a triblock copolymer consisting of two segments of PDMS linked to a HGAP segment. The induced surface reconstruction of silicone rubber (SR)by blending polysiloxane reactants with bifunctional PDMS-b-HGAP copolymers and curing using mold materials having high critical surface tension such as polyethyleneterephthalate was attempted to improve the adhesion between chemically-inert SR and polyurethane (PU). Surface characterization using Foruier transform infrared-attenuated total reflectance indicated that the surface of the SR was enriched with HGAP. The increased content of surface HGAP was suggested to account for the improved adhesion between SR and PU.     

吸附分离对二甲苯的技术进展

简述了吸附分离法制取对二甲苯所用的亲水型和流水两类吸附剂及其人相匹配脱附剂的研究开发、工业应用现状和发展,重点介绍了ＵＩＰ的吸附分离工艺。     

CRM系列核心材料对高掺量混合材复合水泥性能的影响研究

０引言由于混合材料活性的影响 ,复合水泥强度尤其是早期强度随混合材料掺量的增加而显著降低 ,因而混合材料的掺量受到了一定限制。为了解决这一问题 ,在磨制水泥时掺入一定的外加剂或将混合材料预先进行活化再掺入 ,一般可起到助磨、减水并兼有早强作用。需要指出的是 ,国标规定水泥粉磨时只允许掺入不超过水泥重量１ %的助磨剂 ,然而 ,目前一些有早强功能的外加剂多为无机物质 ,掺量通常在１ %以上时早强效果才明显 ,且经常引起后期强度倒缩 ,特别是由此引入的一些有害离子影响混凝土的耐久性。混合材料的单独预活化 ,虽然有一定的增强效…     

提高水泥标号的技术措施

1问题的提出我公司生产的“娲石”牌水泥是通过 ISO9002质量认证的机立窑企业,各项经济技术指标在全省同类型企业中处于领先水平。但是,新的 ISO标准一旦实施,由于水泥试体胶砂组成变化,水灰比加大,灰砂比减小,水泥标号在数值上较现在平均下降约一个标号,这对各水泥企业     

几类重要功能性涂料的研究进展

本文介绍了几类重要功能性涂料的作用机理和研究进展,并指出了提高涂料功能的思路。