开环式聚降冰片烯共混黏弹性阻尼材料的动态阻尼力学热分析

采用开环式聚降冰片烯（NSX）,分别制备了聚降冰片烯-丁腈橡胶（NBR）混合物和聚降冰片烯-松焦油-丁腈橡胶混合物,通过动态力学测试手段重点分析了聚降冰片烯对丁腈橡胶和松焦油-丁腈橡胶共混物的动态阻尼力学特性的影响。研究发现,在特定频率（1.5Hz）和一定温度范围之内（-20-50℃）,聚降冰片烯会使NBR的阻尼性能得到大幅提升,随着聚降冰片烯掺入量的持续增加,阻尼性能随之减小,呈抛物线型增减趋势;松焦油的添加限制了聚降冰片烯对丁腈橡胶的改性功能。所有工况下的Tg值都得到了向高温移动的效果,扩大了材料在建筑结构的应用空间,某些工况会提高共混物的损耗因子峰值,但效果有限。对此次试验的丁腈橡胶来讲,m（NBR）/m（NSX）（70/30）为最佳组分比。

温敏凝胶流变性能动力学研究

应用动态流变实验测定了温敏共聚物的流体特性,分析其在溶胶-凝胶转变过程共聚物溶液随温度变化形成凝胶机理。以室内合成的四元共聚物溶液为基础,采用动态流变实验测定了该共聚物溶液在不同温度、浓度下的剪切模量和损耗模量的变化,确定了凝胶特性,并与试管倒置法比较了凝胶温度。实验结果表明,临界温度为143℃,在一定浓度下(高于接触浓度C*),低于此温度共聚物溶液具有一般粘性流体特性;高于此温度可形成凝胶网络结构;溶液在测试温度(65～240℃)内,其损耗角从56.27°逐渐变为31.04°,溶液体系从粘性流体逐渐到粘弹性流体过渡;说明该溶液在一定浓度下具有温敏特性。

温敏共聚物制备及流变性能研究

简要介绍了四元温敏共聚物的制备方法。采用动态流变法考察了四元共聚物溶液的凝胶点、凝胶强度及凝胶温度。结果表明,在温敏共聚物含量2.0%,频率1 Hz条件下,剪切模量和损耗模量交叉时的凝胶温度为143℃,与试管倒置量法测试的凝胶温度相一致。凝胶强度与四元共聚物含量相关,共聚物含量增加,则凝胶强度增加。

Visco-elastic Properties of VES Diverting Acid for Carbonate Reservoirs

Storage modulus and loss modulus is the main performance index of visco-elastic properties.In this paper the storage modulus and loss modulus of a new diverting acid and their influencing factors were systematically investigated.Besides,the constitutive equations of the diverting acid at different temperatures were elicited from shearing experiments,which show that the visco-elastic surfactant(VES)acid system is a non-Newtonian power law fluid at low temperature and a Newtonian fluid at high temperature.The storage modulus and loss modulus at different temperatures,pH,and VES content in the acid are critical for the design of acid stimulation for oil well,especially when the VES acid is used in this field only on trial and the basic data are in urgent needed for the design and construction of the acidification stimulation.