Synthesis and characterization of five-arms star polymer of N-vinyl pyrrolidone through ATRP based on glucose
作者:Vivek Mishra、Rajesh Kumar
DOI:10.1016/j.carbpol.2010.10.004
日期:2011.2.1
Glucose based five arms atom transfer radical polymerization initiator was synthesized. This initiator was used to synthesize 5-arms star polymer of N-vinyl pyrrolidone (NVP) through controlled radical polymerization. The ratio of reactants were kept as 1:1:2: 200 (initiator:Cu(I)Br:bpy:NVP). The rate of reaction with respect to NVP was found to be first order, and number-average molecular weight increases linearly with temperature up to 90 degrees C. The activation energy (E-a = 29.75 kJ mol(-1)) and enthalpy (Delta H-double dagger=26.73 kJ mol(-1)) were found to be in a good agreement with each other for activated complex, and negative value of entropy of activation (Delta S-double dagger = -219.12 J mol(-1) K-1) supports the highly ordered transition state. (C) 2010 Elsevier Ltd. All rights reserved.
Mucoadhesive and bioadhesive polymers
申请人:Carrington Dennis Stephen
公开号:US20050281775A1
公开(公告)日:2005-12-22
This invention provides a method of augmenting an epithelial mucosal barrier, by contacting the barrier with a topical composition. This invention also provides the topical composition.
The topical composition comprises, dispersed or dissolved in a topically acceptable vehicle, at least one polymer containing either a repeat unit of structure 1 or a repeat unit of structure 2, or a mixture
This method and composition are useful in improving mucosal barrier function by, for example, topical application to an exposed or injured epithelial surface or by coating a compromised mucosal barrier in, for example, inflammatory bowel disease.