Structural Relaxation Behaviour in Polymers; A Molecular Weight Dependence in the Hypersonic Properties of Low Molecular Weight Poly(Propylene Glycol)
作者： L Börjesson , J R Stevens , L M Torell
DOI: 10.1088/0031-8949/35/5/014
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摘要: A molecular weight dependence in the hypersonic properties of low poly(propylene glycol) (PPG) (400-4000) has been measured. Results for PPG 2000 are emphasized. Sound velocity increases with decreasing and maximum loss peak shifts to higher temperatures. We ascribe this effect a decrease flexibility polymer chain backbone as decreases. Hydrogen bonding involving "OH" terminating groups causes an increase gauche/trans ratio stiffens chain.
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