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Copolymerization of caprolactam with polyoxybutylene diamine
Author(s) -
Shalaby S. W.,
Reimschuessel H. K.,
Pearce E. M.
Publication year - 1973
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.760130203
Subject(s) - copolymer , caprolactam , materials science , differential scanning calorimetry , ultimate tensile strength , elongation , rheology , diamine , polymer chemistry , phosphoric acid , nylon 6 , izod impact strength test , composite material , polymer , thermodynamics , physics , metallurgy
Nylon 6‐polyoxybutylene block copolymers were prepared by reacting polyoxybutylene diamine with caprolactam in the presence of phosphoric acid. The copolymerization was carried out in a Helicone‐type reactor and the effect of time, temperature, and caprolactam concentration on the properties of the products was recorded. Differential Scanning Calorimetry studies of the products suggest the presence of both the ABA and AB types of sequences, where A and B represent nylon 6 and polyether blocks, respectively. Dynamic mechanical measurements of typical copolymers revealed the presence of at least two different nylon moieties. The melt rheology data reflect a general increase in the pseudoplasticity of the copolymer with the increase of the polyether content. Increases of the polyether content in the copolymer result in an increased elongation and a decreased tensile strength and modulus.