Relation of glass transition temperature to the hydrogen bonding degree and energy in poly(N-vinyl pyrrolidone) blends with hydroxyl-containing plasticizers: 3. Analysis of two glass transition temperatures featured for PVP solutions in liquid poly(ethyle

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• 作者：Feldstein ; Mikhail M. ; Roos ; Alexandra ; Chevallier ; Cé ; drick ; Creton ; Costantino ; Dormidontova ; Elena E.
• 关键词：Poly(N-vinyl pyrrolidone) blends with poly(ethylene glycol) ; Glass transition temperature ; Effect of hydrogen bonding
• 刊名：Polymer
• 出版年：2003
• 出版时间：March, 2003
• 年：2003
• 卷：44
• 期：6
• 页码：1819-1834
• 全文大小：349 K

文摘

The phase behaviour of poly(N-vinyl pyrrolidone)–poly(ethylene glycol) (PVP–PEG) blends has been examined in the entire composition range using Temperature Modulated Differential Scanning Calorimetry (TM-DSC) and conventional DSC techniques. Despite the unlimited solubility of PVP in oligomers of ethylene glycol, the PVP–PEG system under consideration demonstrates two distinct and mutually consistent glass transition temperatures (T_g) within a certain concentration region. The dissolution of PVP in oligomeric PEG has been shown earlier (by FTIR spectroscopy) to be due to hydrogen bonding between carbonyl groups in PVP repeat units and complementary hydroxyl end-groups of PEG chains. Forming two H-bonds through both terminal OH-groups, PEG acts as a reversible crosslinker of PVP macromolecules. To characterise the hydrogen bonded complex formation between PVP (M_w