Citation: . IR STUDY ON MONOMOLECULAR PARTICLE AGGLOMERATES OF POLYSTYRENE OBTAINED BY FREEZE-DRYING OF ITS DILUTE SOLUTION[J]. Chinese Journal of Polymer Science, ;2002, 20(4): 381-383. shu

IR STUDY ON MONOMOLECULAR PARTICLE AGGLOMERATES OF POLYSTYRENE OBTAINED BY FREEZE-DRYING OF ITS DILUTE SOLUTION

Received Date: 13 December 2001
Revised Date: 22 December 2001

The monomolecular particle agglomerates of polystyrenes were obtained by freeze-drying of its very dilutesolutions of 1.3×10-5-2.0×10-5 g/mL in benzene: cylcohexane (100:1) solvents, and they were annealed at roomtemperature for hundred days before use. According to13C-NMR measurement the polystyrenes should be practically atactic.The number average molecular weights of the samples are 2.80×103, 2.00×104, and 1.55×106, respectively. The freeze-dried aPS with a molecular weight higher than 104 show two new IR absorption bands at 1098 and 1261 cm-1,which are absent in the normal αPS and freeze-dried styrene oligomer.It was also found that the low molecular weight samples can only form powders,whereas the freeze-dried αPS with higher molecular weight form a mixture of powders and fibrils,of which the longer fibrils show a much stronger 1261 cm-1 band than the shorter fibrils and the powder.It seems that the 1261 cm-1 band corresponds to the stacking behavior of monomolecular particles.
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