Application of Ultrasonic Attenuation Measurements in the Studies on Macromolecular Conformational Behaviors--Phase Behavior of the Aqueous Solution of Poly(vinyl methyl ether) Sensitive to Temperature and the Modification of the Behavior by Using Poly(ac

WANGGong-Zheng(王公正); FANGYu(房喻); SHANGZhi-Yuan(尚志远); ZHANGYing(张颖); HUDao-Dao(胡道道)

首页> 外文期刊>中国化学（英文版） >Application of Ultrasonic Attenuation Measurements in the Studies on Macromolecular Conformational Behaviors--Phase Behavior of the Aqueous Solution of Poly(vinyl methyl ether) Sensitive to Temperature and the Modification of the Behavior by Using Poly(ac

【24h】

Application of Ultrasonic Attenuation Measurements in the Studies on Macromolecular Conformational Behaviors--Phase Behavior of the Aqueous Solution of Poly(vinyl methyl ether) Sensitive to Temperature and the Modification of the Behavior by Using Poly(ac

机译：超声衰减测量在大分子构象行为研究中的应用-对温度敏感的聚乙烯基甲基醚水溶液的相行为及对聚（ac）的行为改性

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

The phase behavior of the aqueous solution of poly(vinyl methyl ether) (PVME) sensitive to temperature and the modification of the behavior by using poly(acrylic acid) (PAA) have been studied by ultrasonic attenuation measurements and fluorescence probe techniques. It has been observed that PVME solution is transparent at room temperature and becomes turbid upon heating. The solution turns clear again as soon as the temperature is decreased to room temperature. The heating and cooling process can be repeated for many times. The phase behavior of the solution sensitive to temperature is attributed to the conformational changes of the polymer. PVME may adopt an open coil conformation at room temperature. With this conformation, the polymer is well miscible with the solvent, water, and thereby the system is a real solution. The polymer may adopt a compact coil conformation when the temperature is higher than a specific value, which is called the LCST (the lower critical solution temperature) of PVME. In this case, the polymer tangles to each other and forms various aggregates, which can scatter incident light and ultrasonic waves greatly, resulting in the phase separation. Introduction of PAA decreases the temperature sensitivity of the phase behavior of the polymer. The nature of the inhibition is attributed to the complexation of PAA with PVME and the strong hydrophilicity of PAA. Results from fluorescence probe studies are in accordance with those from ultrasonic attenuation measurements, indicating again that the ultrasonic attenuation method can be successfully used for the qualitative studies of polymer conformations and complexation between polymers.

机译：通过超声衰减测量和荧光探针技术研究了对温度敏感的聚（乙烯基甲基醚）（PVME）水溶液的相行为以及通过使用聚丙烯酸（PAA）对行为的改性。已经观察到PVME溶液在室温下是透明的，并且在加热时变浑浊。温度降低到室温后，溶液再次变澄清。加热和冷却过程可以重复多次。溶液对温度敏感的相行为归因于聚合物的构象变化。 PVME在室温下可采用开放式线圈构型。通过这种构象，聚合物可以很好地与溶剂，水混溶，因此该系统是真正的解决方案。当温度高于特定值（称为PVME的LCST（较低的临界溶液温度））时，聚合物可能会采用紧凑的线圈构型。在这种情况下，聚合物彼此缠结并形成各种聚集体，这些聚集体会极大地散射入射光和超声波，从而导致相分离。 PAA的引入降低了聚合物相行为的温度敏感性。抑制作用的性质归因于PAA与PVME的络合以及PAA的强亲水性。荧光探针研究的结果与超声衰减测量的结果一致，这再次表明，超声衰减方法可以成功地用于聚合物构象和聚合物之间络合的定性研究。

著录项

来源
《中国化学（英文版）》 |2004年第1期|28-32|共5页
作者
WANGGong-Zheng(王公正); FANGYu(房喻); SHANGZhi-Yuan(尚志远); ZHANGYing(张颖); HUDao-Dao(胡道道);
展开▼
作者单位

School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

Institute of Applied Acoustics, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

Institute of Applied Acoustics, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an, Shaanxi 710062, China;

展开▼
收录信息
原文格式 PDF
正文语种 chi
中图分类化学;
关键词
ultrasonic attenuation; conformation; poly(vinyl methyl ether); poly(acrylic acid); complexation;

机译：超声衰减;构象;聚（乙烯基甲基醚）;聚（丙烯酸）;络合;

Application of Ultrasonic Attenuation Measurements in the Studies on Macromolecular Conformational Behaviors--Phase Behavior of the Aqueous Solution of Poly(vinyl methyl ether) Sensitive to Temperature and the Modification of the Behavior by Using Poly(ac

摘要

著录项

相关主题

期刊订阅