An NMR study on sequence distributions of block copolymers of poly(butylene terephthalate) and poly(tetramethylene glycol)

SummaryThe analytical methods to characterize the exact chemical composition and sequence distributions of block copolymers of poly(butylene terephthalate) and poly(tetramethylene glycol) (PBT/ PTMG) were reinvestigated by NMR spectroscopy. To obtain accurate information, the choice of the solvents,...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 1999-05, Vol.42 (5), p.587-594
Main Authors: BUMCHAN, M, SEON-HO, K, HYUN, N, SOO-HAN, K
Format: Article
Language:English
Subjects:
Applied sciences
Block copolymers
Chemical composition
Exact sciences and technology
Mathematical analysis
Molecular weight
NMR spectroscopy
Organic polymers
Parameters
Physicochemistry of polymers
Polybutylene terephthalates
Polytetramethylene glycol
Properties and characterization
Segments
Structure, morphology and analysis
Terephthalate
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Summary:SummaryThe analytical methods to characterize the exact chemical composition and sequence distributions of block copolymers of poly(butylene terephthalate) and poly(tetramethylene glycol) (PBT/ PTMG) were reinvestigated by NMR spectroscopy. To obtain accurate information, the choice of the solvents, NMR experimental conditions, 1H and 13C peak assignments and the methods of calculating various sequence parameters were closely examined. For phenol-d6/tetrachloroethane(TCE) solutions of two copolymers having the hard segment (PBT) contents of 20 and 35wt.%, various sequence parameters were extracted from NMR spectra. In addition to that, we could accurately measure the actual number average molecular weight of PTMG segments within the copolymer by NMR. Measured average molecular weight of PTMG segments was used to calculate theoretical sequence distributions. The experimental and theoretical sequence parameters as well as chemical compositions were compared with each other.
ISSN:0170-0839
1436-2449
DOI:10.1007/s002890050506