Yi SU
,
Xigao JIAN
,
null
材料科学技术（英文）
Poly (phthalazinone ether sulfone) (PPES) with 1:1 and 1:3 ratios of bisphenol A (BPA) unit to phthalazinone unit were selected as samples. Polymer precipitation curves for the ternary systems PPES (1:1)/NMP/ non-solvent and PPES (1:3)/NMP/non-solvent were determined by a titration method. Comparison between two sets of data is made. Non-solvents used were H2O, ethyl ether (EE), diethylene glycol (DEGC), ethyleneglycol methylether (EGME) and butanone (BO). NMP/non-solvent theta-compositions for PPES (1:1) and PPES (1:3) were also estimated. It was found that the volume ratio of non-solvent to NMP at the property mutation or worsening of PPES membrane is close to the theta-composition.
关键词:
Polymer precipitation curve
,
precipitation
,
curve
,
Poly
,
(phthal
惠虎
,
王佳欢
,
王仙河
,
曹昱澎
,
杨帆
机械工程材料
针对运行了20万h的加氢反应器接管弯头材料2.25Cr-1Mo钢,测试了其低温拉伸性能、夏比Ⅴ型缺口冲击功及断裂韧性;在此基础上,得到了其主曲线的参考温度,通过进一步预测得到了该钢在整个韧脆转变区的断裂韧度分布.结果表明:2.25Cr-1Mo钢主曲线的参考温度为-154℃;经过20万h的运行,该钢仍具有充足的韧性;验证了主曲线方法对非核电用2.25Cr-1Mo钢的适用性.
关键词:
2.25Cr-1Mo钢
,
主曲线
,
韧脆转变区
,
断裂韧性
