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The relationship between the equilibrium melting temperature and the supermolecular structure of several polyoxetanes and polyethylene oxide
Author(s) -
Murphy C. J.,
Henderson G. V. S.,
Murphy E. A.,
Sperling L. H.
Publication year - 1987
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.760271103
Subject(s) - oxetane , materials science , ethylene oxide , isothermal process , polymer , crystallization , morphology (biology) , polarized light microscopy , polymer chemistry , melting temperature , oxide , polyethylene , chemical engineering , composite material , thermodynamics , copolymer , optics , physics , genetics , biology , metallurgy , engineering
The relationships between equilibrium melting temperatures ( T m *) and crystalline morphology of poly[3,3bis(ethoxymethyl)oxetane], (polyBEMO), poly[3,3‐bis (azidomethyl)oxetane], (polyBAMO), and poly(ethylene oxide), (PEO), were characterized. The Hoffman‐Weeks extrapolation procedure led to T m * values of 92, 102, and 69°C for these three polymers, respectively. The gross morphologies of polyBEMO, polyBAMO, and PEO were studied as a function of melt‐liquid temperature ( T i ) and isothermal crystallization temperature ( T c ) by visible light microscopy. Spherulitic morphologies were observed for polyBEMO, polyBAMO, and PEO when T i was above T m *, while nonspherulitic (hedritic) morphologies were observed at T l s below T m *. Mixed morphologies were observed when T l was approximately equal to T m *.