In-Situ Copolymerization of Cyclic Poly(butylene terephthalate) Oligomers and ε-Caprolactone

Tripathy, Aruna; MacKnight, William J.; Kukureka, Stephen N.

doi:10.1021/ma0400517

Cited by 64 publications

(52 citation statements)

References 22 publications

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“…As a consequence, ROP is starting to be considered a serious alternative to the traditional polycondensation method for the preparation of the most-extensively used aromatic polyesters. The ROP method has been successfully extended to the synthesis of copolyesters made up of aromatic and aliphatic units as PET with lactones [21,22] and lactides, [23] poly(butylene terephthalate-co-caprolactone), [24] and poly(hexamethylene-co-caprolactone) [25] prepared from ecaprolactone and cyclic oligomers of butylene terephthalate and hexamethylene terephthalate, respectively. A valuable up-dated account of the synthesis and polymerization of cyclic oligoesters has recently been reported by Brunelle.…”

Section: Introductionmentioning

confidence: 99%

Poly(ethylene‐co‐1,4‐cyclohexylenedimethylene terephthalate) copolyesters obtained by ring opening polymerization

González-Vidal

Ilarduya

Muñoz‐Guerra

2009

J. Polym. Sci. A Polym. Chem.

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Cyclic oligomer fractions of ethylene terephthalate c(ET)n and 1,4-cyclohexylenedimethylene terephthalate c(CT)n were obtained by yclodepolymerization of their respective polyesters, the former containing around 80 mol % of trimer and the latter with around 70 mol % of trimer to pentamer. Mixtures of these fractions at selected compositions were subjected to ring opening copolymerization to give a series of poly(ethylene-cocyclohexylenedimethylene terephthalate) copolyesters with ET/CT comonomer ratios ranging from 90/10 to 10/90. The copolyesters were characterized by GPC and NMR, and their thermal properties were evaluated by DSC and TGA. They had essentially the same composition as the feed from which they were produced and had an average-weight molecular weights between 30,000 and 40,000 g/mol with polydispersities between 2 and 2.7. The distribution of the monomeric units in these copolyesters was essentially at random although it evolved to be a blocky microstructure as the contents in the two comonomers became more dissimilar. Their thermal behavior was the expected one for these types of copolyesters with crystallinity and heating stability decreasing with the content in CT units.

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Section: Introductionmentioning

confidence: 99%

Poly(ethylene‐co‐1,4‐cyclohexylenedimethylene terephthalate) copolyesters obtained by ring opening polymerization

González-Vidal

Ilarduya

Muñoz‐Guerra

2009

J. Polym. Sci. A Polym. Chem.

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“…The polymerization time can be set in a broad time interval by suitable catalysts ( [1] and references therein). Prior to polymerization the melt viscosity of the CBT (melting temperature >140°C) may be as low as 20 mPas [2][3]. This is a great advantage for liquid composite molding operations where the reinforcement has to be infiltrated, wet-out accordingly (e.g.…”

Section: Introductionmentioning

confidence: 99%

Melting and crystallization of in-situ polymerized cyclic butylene terephthalates with and without organoclay: a modulated DSC study

Karger‐Kocsis¹,

Shang²,

Ishak³

et al. 2007

Express Polym. Lett.

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Abstract. The polymerization of cyclic butylene terephthalate oligomers (CBT) were studied in presence (in 5 wt.%) and absence of an organoclay (Cloisite ® 30B) by modulated DSC (MDSC). The organoclay containing samples were produced by dry and melt blending, respectively. The first heating, causing the polymerization of the CBT catalyzed by an organotin compound, was followed by cooling prior to the second heating. The MDSC scans covered the temperature interval between 0 and 260°C. The aim of this protocol was to study the crystallization and melting behavior of the resulting polybutylene terephthalate (pCBT) and its organoclay modified nanocomposites. It was found that the thermal behaviors of the polymerizing and polymerized CBT (pCBT) were strongly affected by the sample preparation. The organoclay suppressed the crystallization of the pCBT produced during the first heating. However, results from the second heating suggest that more perfect crystallites were formed in the organoclay modified pCBT variants. The organoclay also affected the conversion and mean molecular mass of the resulting pCBT which were slightly lower than those of the plain pCBT polymerized under identical conditions.

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“…As can be seen from figure 17 a, CBT oligomers exhibited a broad melting range from about 120-170 °C together with a melting peak at 142 °C, as confirmed by other researchers. [68][69] The broad melting range has been ascribed to the different melting temperatures of the oligomers present in the CBT. 28 The ROP of CBT occurred during the first heating scan and a small pCBT melting peak was observed at 226 °C.…”

Section: Thermal Properties Of Pcbtmentioning

confidence: 99%

A Review of the Recent Advances in Cyclic Butylene Terephthalate Technology and its Composites

Abt

Sánchez‐Soto

2016

Critical Reviews in Solid State and Materials Sciences

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In-Situ Copolymerization of Cyclic Poly(butylene terephthalate) Oligomers and ε-Caprolactone

Cited by 64 publications

References 22 publications

Poly(ethylene‐co‐1,4‐cyclohexylenedimethylene terephthalate) copolyesters obtained by ring opening polymerization

Poly(ethylene‐co‐1,4‐cyclohexylenedimethylene terephthalate) copolyesters obtained by ring opening polymerization

Melting and crystallization of in-situ polymerized cyclic butylene terephthalates with and without organoclay: a modulated DSC study

A Review of the Recent Advances in Cyclic Butylene Terephthalate Technology and its Composites

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