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The influence of chain‐ends on the thermal and rheological properties of some 40/60 PES/PEES copolymers
Author(s) -
Abate Lorenzo,
Blanco Ignazio,
Cicala Gianluca,
Recca Giuseppe,
Scamporrino Andrea
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21378
Subject(s) - rheology , copolymer , differential scanning calorimetry , materials science , activation energy , isothermal process , glass transition , intrinsic viscosity , polymer chemistry , thermal decomposition , molar mass , thermodynamics , thermal , polymer , composite material , chemistry , organic chemistry , physics
Four random, differently ended (Cl, NH 2 , OH, and COO − ), polyethersulfone/polyetherethersulfone (PES/PEES) copolymers were studied to investigate the influence of chain ends on thermal and rheological behaviors. The number average molar mass ( M n ≈ 9500 g·mol −1 ) and the PES/PEES ratio (40/60) of all copolymers investigated were checked by 1 H NMR spectra. Thermal degradations were carried out in the scanning mode and initial decomposition temperatures ( T i ) and activation energy values of degradation ( E a ) were obtained. Glass transition temperature ( T g ) was determined by differential scanning calorimetry and complex viscosity (η*) by rheological measurements in isothermal heating conditions ( T = 270°C). All parameters determined were largely affected by copolymer chain ends and decreased according to the same order, OH > NH 2 > Cl > COO − . The results were discussed and interpreted. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers
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