ENTHALPY RELAXATION OF POLYETHERS HAVING PHENYLENE GROUPS IN THE MAIN CHAIN

被引：3

作者：

HATAKEYAMA, T

YOSHIDA, H

HIROSE, S

HATAKEYAMA, H

机构：

[1] IND PROD RES INST,HIGASHI KU,TSUKUBA,IBARAKI 305,JAPAN

[2] TOKYO METROPOLITAN UNIV,SETAGAYA KU,TOKYO 158,JAPAN

来源：

THERMOCHIMICA ACTA | 1990年 / 163卷

关键词：

D O I：

10.1016/0040-6031(90)80395-F

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Two aromatic polyethers and a polysulfide having phosphine oxide group in the main chain were synthesized and the thermal properties of the polyethers and polysulfide were studied by differential scanning calorimetry (DSC) and thermogravimetry (TG). The samples were thermally stable and starting temperatures of decomposition were found at around 750 to 800K. The x-ray diffractograms showed a halo pattern for all samples. The heat capacities of the samples annealed at various temperatures and for various times were measured by DSC. The excess enthalpy of annealed samples was evaluated and the relaxation time was calculated. It was found that the 2, 2-diphenylpropane group accelerated the relaxation rate due to internal rotation of the molecular chain. At the same time, the polysulfide structure was found to contribute to the high relaxation rate. © 1990.

引用

页码：175 / 182

页数：8

共 13 条

[1]

EJIRI K, 1989, SEN-I GAKKAISHI, V45, P51

[2]

HATAKEYAMA H, 1989, ACS S SER, V397

[3] THERMAL-ANALYSIS OF POLYMER SAMPLES BY THE ROUND ROBIN METHOD .3. HEAT-CAPACITY MEASUREMENT BY DSC [J].