Infrared spectroscopic analysis of poly(trimethylene terephthalate)

摘要: Abstract With factor analysis of IR spectra obtained from undrawn poly(trimethylene terephthalate) (3GT) films annealed under various conditions, pure crystalline and amorphous can be extracted absorption peaks each spectrum characterized. A fraction phase in an sample was by curve-fitting the with two on basis least-squares method. The this method showed a very good correlation to crystallinity density measurement. Polarization characteristics 3GT were determined on-line measurement polarized film extension. Intrinsic transition moment angles asymmetric symmetric stretching vibrations CH 2 , several rocking bands, 1037 cm −1 band experimentally conjunction changes dichroic ratio C O vibration molecular chain as function draw ratio. cyclic loading unloading revealed no crystal–crystal transitions, such reversible α→β poly(butylene terephthalate).