Glass transition and crystallization were studied for polyether-ester homologs having halogen substituent on the benzene ring; Polyethylene 1, 2-diphenoxyethane-
p,
p′-dicarboxylate (PEB), Polyethylene 1, 2-di (
o-chlorophenoxy) ethane-
p,
p′-dicarboxylate (PEB
Cl2), Polyethylene 1, 2-di (
o-bromophenoxy) ethane-
p,
p′-dicarboxylate (PEB
Br2), Polyethylene 1, 2-di (
o,
o′-dichlorophenoxy) ethane-
p,
p′-dicarboxylate (PEB
Cl4) and Polyethylene 1, 2-di (
o,
o′-dibromophenoxy) ethane-
p,
p′-dicarboxylate (PEB
Br4).
Glass transition temperature measured by DTA increased in the order, PEB<PEB
Cl2_??_PEB
Cl4<PEB
Br2<PEB
Br4. Cold crystallization temperature measured by DTA increased in the order, PEB<PEB
Cl2<PEB
Br2, and PEB
Cl4 and PEB
Br4 showed no crystallization peak. The crystallization rate followed by the change of density decreased in the order, PEB>PEB
Cl2>PEB
Br2>PEB
Cl4. Crystallinity estimated by the X-ray diffraction intensity curve also decreased by halogen substitution. Effect of halogen substitution and crystallization on the infrared spectrum of polyether-ester homologs was studied. Some discussion was made on these results.
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