改性沥青混凝土配合比设计

鉴于聚合物改性沥青可以明显改善沥青混凝土路面的低温和高温性能,延长道路使用寿命,因此聚合物改性沥青已经成为全球沥青路面的首选。本次高速公路项目的路面上面层组成配合比设计就添加和利用了石灰岩集料和SBS改性沥青(基质沥青为韩国SK重交沥青AH-70)来进行配合比筛选和设计,并得出最佳沥青用量和沥青混凝土密度,总结SBS改性沥青混凝土相比于普通沥青混凝土具有更好性能。     

自组装金属酞菁聚合物的合成及表征

通过逐步聚合的方法合成了一种新的含有长烷基链的金属酞菁的聚合物,这种自组装的聚合物有很好的溶解性能,且很容易成膜,并对其光以及电化学性能进行研究.从紫外可见光谱图中可以看到两个强的吸收带,分别位于600-700 nm,以及300-400 nm.这种物质具有低的禁带宽度(Eg<1.8 eV),很容易吸收太阳光.采用332 nm的光作为激发光源,它的溶液的发射峰出现在402nm.从循环伏安图上可以观察到,两个可逆的氧化还原过程出现在0.64 V,-1.10 V.     

现代汉语聚合词简述

聚合词是现代汉语中一类比较特殊的词汇,它相当活跃却鲜为人所关注.本文拟以前人有限的研究成果为基础,试图对聚合词的概念、分类、语法特征等问题进行更深入的探究,并且试图从声调入手来揭示聚合词内部语素的排序规律.     

力学谱技术在聚合物流体结构转变过程中的研究进展

介绍了近年来利用力学谱技术研究聚合物流体(聚合物熔体和高分子浓溶液)结构转变过程的进展，分析了分子质量和共混物质量浓度对单分散聚合物熔体液/液转变过程的影响及其液/液转变机制，并介绍了嵌段共聚物聚氧乙烯/聚氧丙烯/聚氧乙烯(PEO PPO PEO)浓溶液的相转变过程随温度、聚合物质量浓度和NaCl等因素变化的关系，指出了今后力学谱技术在软凝聚态领域有待于进一步研究的方向.     

LLDPE/TiO2 nanocomposites produced from different crystallite sizes of TiO2 via in situ polymerization

Nano-TiO2 particles with a range of crystallite sizes were synthesized by a conventional sol-gel method,and then used as nanoparticle substrates in the synthesis of LLDPE/TiO2 nanocomposites via in situ polymerization of ethylene/1-hexene with zirconocene/MMAO catalyst.It was found that the size of the nano-TiO2 crystallite nanoparticles can influence the catalytic activity in the polymerization system.The larger nano-TiO2 crystallites provided better catalytic activity in the polymerization system due to more space for monomer attack.In addition,by thermo-gravimetric analysis,it can be seen that the larger nano-TiO2 crystallites also exhibited lower interaction with available MMAO.Consequently,the MMAO reacted more efficiently with the zirconocene catalyst during the activation process,and enhanced polymerization catalysis.All the polymer nanocomposites products did not have well defined melting temperature indicating non-crystalline polymers.This is due to the high amount of hexene incorporation(based on 13C NMR).The difference in crystallite sizes of the nano-TiO2 also affected how 1-hexene became incorporated into the polymer nanocomposites.The smaller crystallite size of nano-TiO2 allowed greater 1-hexene incorporation due to depression of the reactivity of the ethylene.The contribution of this work helps develop a better understanding of the role of nano-TiO2 in the catalytic activity of the polymerization system and in the microstructure of the polymer composite product.However,this study only considers work on the laboratory scale,so for commercial application of these results,it is necessary to scale up the polymerization process.It is only at this stage,that other physical properties,such as the mechanical properties of these materials can be sensibly determined.     

GFRP加固带壁柱砖墙抗剪面积的简化计算

通过1片未加固带壁柱砖墙和9片玻璃纤维增强复合材料(GFRP)加固带壁柱砖墙的抗震性能试验,分析带壁柱墙体中壁柱对墙体抗剪承载力的影响,并提出壁柱影响系数.从等效抗侧移刚度入手,推导出壁柱影响系数最大值的计算表达式;运用壁柱隔离法,推导出壁柱影响系数的最小值计算表达式,并结合壁柱的开洞损伤情况,给出壁柱影响系数的统一表达式,从而简化了计算.最后,通过试验验证该系数提出的合理性.     

应力－应变的群子统计理论模型及对实验结果的分析

本文把高分子材料的拉伸过程看成是拉什链段和非拉伸链段的竞争发展过程，采取大系综和群子分布的方法，建立了能描述８种应力－应变曲线类型的统一的模型方程．用大量的实验数据和文献数据对模型进行了检验，取得了良好的吻合，同时得到了不同材料在形变过程中的群子参数变化规律．