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Crystallization Behavior of Syndiotactic Poly(propylene) Freeze‐Dried from Toluene at Very Dilute Concentration
Author(s) -
Sun Qing,
Fu Qiang,
Xue Gi,
Chen Wei
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20011001)22:14<1182::aid-marc1182>3.0.co;2-4
Subject(s) - crystallinity , differential scanning calorimetry , crystallization , toluene , materials science , tacticity , chemical engineering , polymer chemistry , isothermal process , polymer , chemistry , organic chemistry , composite material , polymerization , thermodynamics , physics , engineering
Syndiotactic poly(propylene)s (s‐PPs) were freeze‐dried from toluene solutions of various concentrations. FT‐IR spectroscopy and wide‐angle X‐ray diffraction were used to characterize the s‐PPs prepared. The isothermal crystallization behavior was also investigated by means of differential scanning calorimetry. The disentangled particles are of high crystallinity and show rapid crystallization rates. A trans‐planar conformation is developed when s‐PP was freeze‐dried from more dilute solution.