Amorphous‐Crystalline PS  n  PEO  n   Heteroarm Star Copolymers: Crystallinity and Crystallization Kinetics | Zendy

Koutsopoulou Eleni | Zendy; Tsitsilianis Constantinos | Zendy

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Amorphous‐Crystalline PS n PEO n Heteroarm Star Copolymers: Crystallinity and Crystallization Kinetics

Author(s) -

Koutsopoulou Eleni,

Tsitsilianis Constantinos

Publication year - 2004

Publication title -

macromolecular chemistry and physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.57

H-Index - 112

eISSN - 1521-3935

pISSN - 1022-1352

DOI - 10.1002/macp.200400120

Subject(s) - crystallization , crystallinity , supercooling , materials science , copolymer , differential scanning calorimetry , ethylene oxide , amorphous solid , polymer chemistry , isothermal process , polystyrene , crystallization of polymers , melting point , chemical engineering , thermodynamics , polymer , crystallography , chemistry , composite material , physics , engineering

Summary: The crystallization behavior and kinetics of poly(ethylene oxide) in polystyrene/poly(ethylene oxide) heteroarm star copolymers were studied by differential scanning calorimetry and optical microscopy. A comparison between star and linear amorphous‐crystalline block copolymers showed that the macromolecular architecture is an important factor affecting crystallinity. The following points were observed: the equilibrium melting point is higher in the star copolymers, the crystallinity reduces as the number of arms increases, leading to smaller and ill‐defined spherulites, and crystallization proceeds faster in linear copolymers at low supercooling.Half crystallization times, t 1/2 , calculated from the Avrami analysis of the latent heats, obtained during the isothermal crystallization experiments as a function of supercooling, Δ T , for all copolymers.

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