A 13C n.m.r. study of transesterification in mixtures of poly(ethylene terephthalate) and poly(butylene terephthalate)

Backson, Sofie Cecilia Ellinor; Kenwright, Alan M.; Richards, Roy J.

doi:10.1016/0032-3861(95)91443-b

Cited by 68 publications

(49 citation statements)

References 18 publications

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“…The reactivities of BD and MPD with SA can be assumed to not differ by much. The average number sequence lengths [33,45,[48][49][50] of BS and MS units are L nBS = 2P BS /P(BSM) and L nMS = 2P MS /P(BSM), respectively. In the case of PBMPSu 50/50, both values were 2.0.…”

Section: Results and Discussion 31 Molecular Weights And Distributionmentioning

confidence: 99%

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

Chen¹,

Yang²,

Chen

et al. 2011

Express Polym. Lett.

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Abstract. Poly(butylene succinate) (PBSu), poly(2-methyl-1,3-propylene succinate) (PMPSu), and PBSu-rich copolyesters were synthesized using an effective catalyst, titanium tetraisopropoxide. Measurements of intrinsic viscosity (1.20-1.28 dl/g) and gel permeation chromatography demonstrated the success of the preparation of polyesters with high molecular weights. The compositions of the copolyesters were determined in three approaches from 1 H and 13 C NMR (nuclear magnetic resonance) analyses, and good agreement between the results was obtained. The distributions of the comonomers were found to be random from the spectra of carbonyl carbon. Their thermal properties were elucidated using a differential scanning calorimeter and a thermogravimetric analyzer. No marked difference exists among the thermal stabilities of these polyesters. However, the window between the glass transition and the melting temperatures becomes narrower with the increase in the concentration of 2-methyl-1,3-propylene succinate in the copolymers. Additionally, the cold crystallization ability decreases considerably. Finally, PMPSu is an amorphous homopolymer. Wide-angle X-ray diffractograms of isothermally crystallized copolyesters also follow the same trend.

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Section: Results and Discussion 31 Molecular Weights And Distributionmentioning

confidence: 99%

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

Chen¹,

Yang²,

Chen

et al. 2011

Express Polym. Lett.

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“…30 Research in this ®eld has mostly been addressed to control exchange reactions taking place either during the meltmixing process or in the heated solid-state. 26 Transesteri®cation in polyester blends includes alcoholysis and acidolysis intermolecular reactions and both intraand inter-molecular ester±ester exchange reactions, 38 as shown in Scheme 2.…”

Section: ±5mentioning

confidence: 99%

A review on the potential biodegradability of poly(ethylene terephthalate)

1999

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“…8 -11 NMR is often employed for compositional and sequential analysis of aromatic polyesters. [12][13][14][15][16] The characterization of several end groups of PET and poly(butylene terephthalate) by NMR has been reported in the literature. 17 However, so far there has been no report on intensive NMR studies of various end groups of PET, including unsaturated species.…”

Section: Introductionmentioning

confidence: 99%

End-group characterization of homo- and copolyesters of cyclohexane-1,4-dimethanol

Amari

Nishimura

Minou

et al. 2001

J. Polym. Sci. A Polym. Chem.

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A 13C n.m.r. study of transesterification in mixtures of poly(ethylene terephthalate) and poly(butylene terephthalate)

Cited by 68 publications

References 18 publications

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

A review on the potential biodegradability of poly(ethylene terephthalate)

End-group characterization of homo- and copolyesters of cyclohexane-1,4-dimethanol

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