Crystallization Behavior of Poly(3,3-bis(Ethoxymethyl) Oxetane) and Poly(3,3-bis(Azidomethyl) Oxetane),

reportActive / Technical Report | Accession Number: ADA148271 | Open PDF

Abstract:

Two crystal modifications have been found for poly 3,3-bisethoxymethyl oxetane, polyBEMO, by wide-angle x-ray powder diffraction and differential scanning calorimetry while only one modification has been found for poly3,3-bisazido methyl oxetane, polyBAMO. Melting temperatures for the two polymers were nearly the same, varying from about 70 deg C to about 90 deg C depending on the thermal treatment higher crystallization temperatures resulted in higher melting temperatures. The equilibrium melting temperature, T sub m, was found to be 125 deg C and 128 deg C for polyBEMO and polyBAMO, respectively, using the Hoffman-Weeks extrapolation procedure. Measurement of the melting point depression of polyBEMO and polyBAMO in di-butyl phthalate yielded enthalpy of fusion values of 2.25 kcalmole and 12.8 kcalmole, respectively. The percent crystallinity for polyBEMO and polyBAMO, respectively was calculated to be 55-60 and 13-30 based on DSC and x-ray analysis.

Author(s):
Hardenstine, K. E. ; Henderson, G. V., Jr. ; Sperling, L. H. ; Murphy, C. J.
Author Organization(s):
LEHIGH UNIV BETHLEHEM PA
Pagination:
0041

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Subject Terms
Joint Capability Areas:
JCA_5.3_Planning; JCA_5_Command and Control; JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation; JCA_1_Force Support
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*POLYMERS, *CRYSTALLIZATION, *OXETANES, CRYSTAL STRUCTURE, METHYL RADICALS, MODIFICATION, BLOCK COPOLYMERS, X RAY DIFFRACTION, HEAT TREATMENT, MONOMERS, PHTHALATES, ENTHALPY, MELTING POINT, CALORIMETRY, HEAT OF FUSION
Field(s)/Group(s):
Polymer Chemistry, Crystallography
Keyword(s):
Oxetane Ethoxymethyl, Oxetane Azidomethyl, Homopolymers
Report Date:
1983 Jan 01