Premium
Studies on the Effect of Glass Transition on the Crystalline Transition in Syndiotactic Polystyrene – Solvent Complexes
Author(s) -
Naidu Sudhakar,
Ramesh N.C.
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200851315
Subject(s) - glass transition , differential scanning calorimetry , solvent , decalin , tacticity , polystyrene , mesitylene , polymer chemistry , amorphous solid , materials science , toluene , solvent effects , dichloromethane , chemistry , organic chemistry , polymer , thermodynamics , physics , catalysis , polymerization
Summary: Amorphous syndiotactic polystyrene (sPS) was crystallized at room temperature in Norbornadiene (bicyclo[2,2,1]‐hepta‐2,5‐diene), Mesitylene (1,3,5‐ Trimethylbenzene), 3‐Carene (3,7,7‐trimethyl bicyclo[4,1,0]hept‐3‐ene) and DMN (1,4‐Dimethylnaphthalene) to form the sPS‐solvent complex ( δ form) with respective solvent molecules. In situ HTFTIR studies showed that the δ form to γ form transformation temperature occurs well below the glass transition temperature of sPS, which is depressed due to the presence of solvent in the amorphous phase; higher the solvent content in the complex, lower the transition temperature. Glass transition temperatures determined by Modulated differential scanning calorimetry (MDSC) coincide with the transition temperatures, indicating that the δ form transforms into γ form at the glass transition temperature for these complexes. Such a behavior is very different from the behaviour of the sPS‐ solvent complexes formed by dichloromethane, chloroform, toluene, o ‐dichlorobenzene, decalin (cis‐trans) etc. and for these complexes the transition occur well above the T g. 1