Synthesis and characterization of segmented polyurethanes based on polyethylene and polytetramethylene glycols part 2 thermo mechanical and sweling properties

VNU JOURNAL OF SCIENCE, Nat S cL & Tech., T xx, N03, 2004 S Y N T H E S I S A N D CHARACTERIZATION OF S E G M E N T E D P O L Y U R E T H A N E S B A S E D ON P O L Y E T H Y L E N E A N D PO L Y T E T R A M E T H Y L E N E GLYCOLS PART 2: THERMO-MECHANICAL AND SWELING PROPERTIES Ph am N goc Lan Polymer Research Cen ter, Hanoi University o f Technology N gu yen Thu Hang College o f Science, Vietnam N ational University, Hanoi In trod u ction In the previous paper [1] we presented our study on the synthesis and characterization of some SPUs based on polyethylene and polytetramethylene glycols Segmented polyurethanes (SPUs) are multiblock copolymers Due to their specific phase separation characteristics caused by incompatibility between the hard and soft segments, they have quite good biocompatibility [2] In this paper we present the second part of our study on the thermo-mechanicahand swelling properties of the SPUs based on polyethylene and polytetram ethylene glycols The effects of the macrodiols on the properties of the SPUs obtained were discussed E xp erim en tal 2.1 M a teria ls Polyethylene and polyteramethylene glycols selected for preparation of the polyurethanes are listed in the table Before use they were carefully dried by azeotropic distillation of the toluene solution and subsequent removal of the solvent Table 1: Polydiols for preparation of SPUs Polyol M n“ Mn