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首页> 外文期刊>Phase Transitions, A Multinational Journal >A new technique for determination of melting temperature of poly(ethylene glycol) by ultrasonic velocimetry
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A new technique for determination of melting temperature of poly(ethylene glycol) by ultrasonic velocimetry

机译：超声波测速仪测定聚乙二醇熔融温度的新技术

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摘要

Ultrasonic velocity and density of poly(ethylene glycol) (PEG) (mol. wt. 2000 and 8000) solutions in water and benzene have been studied as a function of temperature from which respective isentropic compressibility has also been calculated. The velocity (as well as isentropic compressibility) undergoes a sudden change near melting temperature, T m, of the solute polymer. Normally, we expect only one peak in viscoelastic properties at the T m of PEG. However, we see two peaks (T m1 and T m2) in the case of the aqueous solution of PEG while there is only one peak for the case of benzene solution. This has been interpreted on the basis that one of the peaks (T m1) is for unsolvated PEG and the other peak (T m2) is that of PEG with water solvation shell. Such solvation shell is not formed with the aprotic solvent (benzene).View full textDownload full textKeywordsmelting temperature, polymer, ultrasonic velocity, solvation shellRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01411590903259472
机译：研究了聚乙二醇（PEG）（摩尔重量2000和8000）在水和苯中的超声速度和密度与温度的关系，并由此计算出各向同性的可压缩性。速度（以及等熵可压缩性）在溶质聚合物的熔化温度T m 附近突然改变。通常，我们预期在PEG的T m 处只有一个峰值的粘弹性。但是，在PEG水溶液中，我们看到两个峰（T m1 和T m2 ），而在苯溶液中只有一个峰。这是根据一个峰（T m1 ）是未溶解的PEG而另一个峰（T m2 ）是带有水溶壳的PEG的峰来解释的。这样的溶剂化壳不会与非质子传递溶剂（苯）形成。查看全文下载关键词熔炼温度，聚合物，超声速度，溶剂化壳相关的var addthis_config = {ui_cobrand：“ Taylor＆Francis Online”，services_compact：“ citeulike，netvibes，twitter， technorati，delicious，linkedin，facebook，stumbleupon，digg，google，more“，发布：” ra-4dff56cd6bb1830b“};添加到候选列表链接永久链接http://dx.doi.org/10.1080/01411590903259472

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