Stepwise annealing of poly(butylene terephthalate)

Yasuniwa, Munehisa; Murakami, Takahiro; Ushio, Motonori

doi:10.1002/(sici)1099-0488(19990901)37:17<2420::aid-polb13>3.0.co;2-8

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…In our previous study it was demonstrated that during the standard industrial process of extruding the PBT tubes a fine crystalline α phase forms, while its relative content there amounts to ∼29% (M. Ambroziak, I. Gruin, K. Zdunek, and M. Wronikowski, unpublished observations). The value is much less than the one reported in the literature1 for the maximal content of the crystalline phase in PBT, reported to be ∼66%.…”

Section: Introductioncontrasting

confidence: 57%

The effect of structural features on mechanical properties of loose optical fiber poly(butylene terephthalate) tubes

Ambroziak

Gruin

Wronikowski

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:Results of a study on the modifying mechanical properties of loose optical-fiber poly(butylene terephthalate) (PBT) tubes, produced during the standard industrial extrusion process, show that heat treatment make the structure of their material to change. The study comprised measurements of mechanical strengths properties of the tubes (tensile strength, compression strength, kinking) and determination of tube material structure [by differential thermal analysis (DTA), wide angle X-ray scattering analysis (WAXD), and scanning electron microscopy (SEM)]. Results of the study allowed observation that the annealing at 70°C for 34 h of the tubes caused the crystalline ␣ phase to increase in the tube material from ϳ28.5% to ϳ31.5% and the structure of the existing crystallites to become more perfect. This made the values of certain mechanical properties of the tubes to increase even by as much as 30%. The tubes following such thermal treatment could be used in cables exposed to heavy-duty operation in arduous environments, where a larger margin from the standpoint of mechanical properties is required.

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Section: Introductioncontrasting

confidence: 57%

The effect of structural features on mechanical properties of loose optical fiber poly(butylene terephthalate) tubes

Ambroziak

Gruin

Wronikowski

et al. 2002

J of Applied Polymer Sci

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show abstract

“…The results obtained allowed conclusion that during the standard industrial PBT tube extrusion process a finely dispersed crystalline α phase is formed in a quantity of ∼29%. The value is much less compared with the literature value of 66% (Yasuniwa et al, J Polym Sci B 1999, 37, 24201) reported for a possible maximal content of the crystalline phase in PBT. Accordingly, it was assumed that the quantity of the crystalline phase in the tubes can be made to increase by their heating at a temperature above the glass transition temperature ( T g ) of PBT.…”

contrasting

confidence: 56%

“…The percentage of the crystalline phase in the tubes examined was found to be 28.8%. Elsewhere,1 upon application of special heat treatment conditions and at an increased pressure, the crystalline phase in PBT polymer (but not in PBT tubes) was made to rise to a level of 66%. The value appears to be the highest attainable for this phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of structural features of poly(butylene terephthalate) tubes on the useful properties of the loose tube/optical fibers system in the tubular optical fiber cables

Ambroziak

Gruin

Zdunek

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:To verify a hypothesis that a relationship exists between the useful properties of the loose tube/optical fibers system and the structural features of poly(butylene terephthalate) (PBT) tubes, optical attenuation of optical fibers was studied both in the tubular optical fiber cable and in the tube proper. Examinations of the tube material structure was also performed by the DTA, SEM, and WAXD techniques. The results obtained allowed conclusion that during the standard industrial PBT tube extrusion process a finely dispersed crystalline ␣ phase is formed in a quantity of ϳ29%. The value is much less compared with the literature value of 66% (Yasuniwa et al., J Polym Sci B 1999, 37, 2420 1 ) reported for a possible maximal content of the crystalline phase in PBT. Accordingly, it was assumed that the quantity of the crystalline phase in the tubes can be made to increase by their heating at a temperature above the glass transition temperature (T g ) of PBT. Results of the study corroborate the soundness of the assumption that during the optical cable conditioning process over its working temperature range, i.e., from Ϫ40 to 70°C, crystallisation of PBT tubes is likely to occur to result in their shrinkage which, as proven, affects the optical fibers attenuation, which is a major useful property of optical cables.

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“…DSC curves show double overlapping melting peaks, which were explained by the melt-recrystallization process. 20,21 The wide low-temperature melting peaks with a small amplitude are connected with the melting of the small crystallites, with a wide size of distribution. The other narrow melting peak in the higher temperature has a bigger amplitude and is attributed to the melting of the large-size crystallites with narrow size of distribution.…”

Section: Resultsmentioning

confidence: 99%

Complementary study of molecular dynamics and domain sizes in heterogenous nanocomposites PBT/DA-C60 and PBT/TCNEO-C60

Woźniak-Braszak

Baranowski

Jurga

et al. 2014

Journal of Applied Physics

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Articles you may be interested inEffects of 2 nm size added heterogeneity on non-exponential dielectric response, and the dynamic heterogeneity view of molecular liquids J. Chem. Phys. 137, 104502 (2012); 10.1063/1.4748355 Oscillatory behavior of C60-nanotube oscillators: A molecular-dynamics study J. Appl. Phys. 97, 094313 (2005); 10.1063/1.1890451 Interfacial molecular recognition of adenine, adenosine and ATP by a C60uracil adduct via complementary base pairing AIP Conf. A molecular dynamics study of impurity desorption from solid clusters of rigid C60 molecules J. Chem. Phys. 106, 6475 (1997); 10.1063/1.473613Modified neglect of diatomic overlap approach to a molecular dynamics study of C20-C60 carbon clusters A comprehensive study of molecular dynamics and structure in new heterogenous nanocomposites based on poly(butylene terephthalate) and nanoparticles C 60 modified by n-decylamine or tetracyanoethylene oxide has been performed. The domain structure of new nanocomposites has been investigated by Fourier transform infrared spectroscopy, wide-angle X-ray scattering, and differential scanning calorimetry techniques. Solid-state 1 H NMR techniques were used to study molecular dynamics and domain sizes in new nanocomposites. Information about the electronic properties of these nanocomposites was obtained by means of electron paramagnetic resonance method. It was shown that the structure and molecular dynamics of new nanocomposites were strongly dependent on the properties and concentration of fullerene derivates. V C 2014 AIP Publishing LLC.

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Stepwise annealing of poly(butylene terephthalate)

Cited by 15 publications

References 23 publications

The effect of structural features on mechanical properties of loose optical fiber poly(butylene terephthalate) tubes

The effect of structural features on mechanical properties of loose optical fiber poly(butylene terephthalate) tubes

Effect of structural features of poly(butylene terephthalate) tubes on the useful properties of the loose tube/optical fibers system in the tubular optical fiber cables

Complementary study of molecular dynamics and domain sizes in heterogenous nanocomposites PBT/DA-C60 and PBT/TCNEO-C60

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