Hydrogen Bonding and Crystallization in Biodegradable Multiblock Poly(ester urethane) Copolymer


Autoria(s): Wang W; Wang WS; Chen XS; Ing XB; Su ZH
Data(s)

2009

Resumo

The hydrogen bonding and crystallization of a biodegradable poly(ester urethane) copolymer based on poly(L-lactide) (PLLA) as the soft segment were investigated by FTIR. On slow cooling from melt, the onset and the progress of the crystallization of the urethane hard segments were correlated to the position, width, and relative intensity of the hydrogen-bonded N-H stretching band. The interconversion between the "free" and hydrogen-bonded N-H and C=O groups in the urethane units in the process was also revealed by 2D correlation analysis of the FTIR data. The crystallization of the PLLA soft segments was monitored by the ester C=O stretching and the skeletal vibrations. It was revealed that the PLLA crystallization was restricted by the phase separation and the urethane crystallization, and at cooling rates of 10 degrees C/min or higher, the crystallization of the PLLA soft segments was prohibited.

Identificador

http://202.98.16.49/handle/322003/12407

http://www.irgrid.ac.cn/handle/1471x/148616

Idioma(s)

英语

Fonte

Wang W;Wang WS;Chen XS;Ing XB;Su ZH.Hydrogen Bonding and Crystallization in Biodegradable Multiblock Poly(ester urethane) Copolymer,JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2009,47(7 ):685-695

Palavras-Chave #SHAPE-MEMORY POLYMERS #PHASE-SEPARATION BEHAVIOR #MICROPHASE SEPARATION #SPECTROSCOPIC ANALYSIS #RHEOLOGICAL PROPERTIES #INFRARED-SPECTROSCOPY #MODEL POLYURETHANES #BLOCK INCOMPATIBILITY #POLY(L-LACTIC ACID) #RESTRICTED GEOMETRY
Tipo

期刊论文