Study on the thermoresponsive two phase transition processes of hydroxypropyl cellulose concentrated aqueous solution: from a microscopic perspective

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• 作者：Ying Jing (1)
  Peiyi Wu (1)
  
• 关键词：Hydroxypropyl cellulose ; Two ; dimensional correlation spectroscopy ; Coil ; to ; globule transition ; Sol–gel transition ; Hydrophobic interactions ; Hydrogen bonding
• 刊名：Cellulose
• 出版年：2013
• 出版时间：February 2013
• 年：2013
• 卷：20
• 期：1
• 页码：67-81
• 全文大小：1108KB
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• 作者单位：Ying Jing (1)
  Peiyi Wu (1)
  
  1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, China
  
• ISSN：1572-882X

文摘

In this paper, it was discovered that during the heating process from 35 to 63?°C, hydroxypropyl cellulose (HPC) concentrated aqueous solution (20?wt%) would first go through coil-to-globule transition and then sol–gel transition with temperature elevation. The microdynamic mechanisms of the two phase transitions were thoroughly illustrated using mid and near infrared spectroscopy in combination with two-dimensional correlation spectroscopy (2Dcos) and perturbation correlation moving window (PCMW) technique. Mid infrared spectroscopy is an effective way to study the hydrophobic interactions in HPC molecules. And near infrared spectroscopy is a potent method to study hydrogen bonds between HPC molecules and water molecules. Boltzmann fitting and PCMW could help determine the exact transition temperatures of each involving functional groups in the two processes. Moreover, 2Dcos was used to discern the sequential moving orders of the functional groups during the two phase transitions. Depending on the structure of HPC and the thermodynamic conditions, the dominating associative elements in either process might vary. During the coil-to-globule transition, HPC molecules precipitated to form an opaque system with mobility.It was discovered that the driving force of the coil-to-globule transition process in microdynamics could only be the dehydration and hydrophobic interactions of C–H groups. However, in the sol–gel transition, the system crosslinked to form a physical network with no mobility. The driving force of this process in microdynamics was primarily the self-assembly behavior of O–H groups in HPC “active molecules-