Controlled Transesterification and Its Effects on Structure Development in Polycarbonate–Poly(Butylene Terephthalate) Melt Blends

Tattum, S. B.; Cole, Don; Wilkinson, Andrew

doi:10.1081/mb-100100399

Cited by 25 publications

(25 citation statements)

References 34 publications

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“…Blends based on PC and PBT have received much commercial attention for the last 20-30 years, especially in the automotive industry [48][49][50][51][52][53][54][55][56][57] . PC is a good engineering plastic.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Rajakumar¹,

Nanthini²

2013

ILCPA

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Polybutylene Terephthalate (PBT) / Polycarbonate (PC) nanocomposite blend was fabricated using melt blending technique in a twin extruder. The blend composition was optimized at PBT-PC weight ratio of 80-20. The effect of incorporation of various organically modified Montmorillonite (OMMT) and naturally occurring sodium Montmorillonite (MMT) on the mechanical, thermal and morphological properties of the nanocomposites blend has been investigated. It was observed that the Izod impact strength, tensile strength and flexural strength demonstrated a significant increase with the increase in clay loading from 1-7 weight % due to homogeneous dispersion of clay within the blend matrix. Thermo gravimetric analysis (TGA) revealed an increase in thermal stability of the blend with the incorporation of nanoclay. There is also decrease in the melting temperature (Tm) and crystallisation temperature (Tc) as observed from DSC thermograms. DMA add the evidence for TGA, DSC and mechanical results. PBT -PC blend with clay exhibited featureless XRD indicative of exfoliated structure. TEM micrographs also confirm the same that the clay has exfoliated into individual layers.

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Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Rajakumar¹,

Nanthini²

2013

ILCPA

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“…in terms of miscibility and crystallization behavior, [20][21][22][23][24][25][26] focusing on their most important properties for the applicative purposes. For example, the efficiency of the catalysts versus the transesterification reactions, and thus the miscibility and the thermal transitions, has been largely studied.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the efficiency of the catalysts versus the transesterification reactions, and thus the miscibility and the thermal transitions, has been largely studied. [20][21][22][23][24][25][26] However there are few papers which analyze in depth the importance of block size on phase behavior.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of Poly(ethylene terephthalate) in Poly(ethylene terephthalate)/Bisphenol A Polycarbonate Block Copolymers: Influence of Block Length and Role of the Rubbery Amorphous Component

Celli

Marchese

2004

Macro Chemistry & Physics

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Summary: Analysis was made of the crystallization of the PET blocks in PET/PC copolymers as a function of the block length, varying from $\overline M _{\rm n}$ = 5300 to 17100 g · mol−1 (Xn PET = 28–89, PET monomeric sequences). Analysis was also made of a series of PET homopolymers with the same $\overline M _{\rm n}$ values. The copolymers were found to crystallize at a slower rate, with lower crystallinity and lower crystal perfection, than the homopolymers and secondary crystallization does not take place, unlike with PET homopolymers. However the crystallization mechanism is the same. The plot of the crystallization rate versus Xn PET shows that the homopolymers have a maximum crystallization rate at Xn PET ≅ 50 ($\overline M _{\rm n}$ ≅ 10000 g · mol−1), whereas the crystallization rate for copolymers continuously increases with the increment of Xn PET (see Figure). The decrement of the crystallization rate for homopolymers with $\overline M _{\rm n}$ higher than 10000 g · mol−1 has been interpreted as due to the effect of the high melt viscosity. For copolymers with long PET blocks, instead, a phase separation is likely and improves the PET reptation and fold, causing an increment in crystallization rate. Block size and miscibility between the components are therefore the key parameters in understanding the crystallization process in PET/PC block copolymers.

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“…and Hay, 46 Montaudo et al, 47 Pellow-Jarman and Hetem, 48 Tattum and coworkers, 37 Wilkinson and colleagues, 25 This PC-PBT blends may undergo three types of exchange reactions during melt processing: 48,49 acidolysis (reaction between the carboxyl end-groups of PBT with the carbonate groups of the PC), alcoholysis (reaction between the hydroxyl end-groups of PBT with the carbonate groups of PC) and direct transesterification (reaction between the ester groups of PBT with the carbonate groups of PC). The main process is that of direct transesterification.…”

Section: The Transesterification Reaction Between Pc and Pbtmentioning

confidence: 99%

“…This polymer has one of the highest rates of crystallisation of common polymers and, although some retardation occurs, due to the presence of the PC in the PBT-rich phase, the crystallisation kinetics of the PBT-rich phase is still fast in most PC-PBT blends. 34,37 Finally, the reductions of the molecular weight of the PC and of the PBT due to thermal degradation 6,62 and the occurrence of transesterification also contribute to miscibility of PC and PBT. Summarising, it can be established that the construction of a phase diagram of the PC-PBT blend system from the thermodynamic point of view would be very difficult, if at all possible.…”

Section: Phase Separation In Pc-pbt Blendsmentioning

confidence: 99%

Polymer blends: the PC–PBT case

Santos

Guthrie

2006

J. Mater. Chem.

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Binary polymer alloys represent a fast growing sector of the plastics industry. They can result in new materials exhibiting high degrees of synergism in behaviour and/or materials with optimal cost/performance. >Please check the proof of your paper carefully. Your proof will not be read in detail by staff after you have returned it to us. It is your responsibility to ensure that the proof has been read carefully. Translation errors between word-processor files and typesetting systems can occur so the whole proof needs to be read even if an electronic file has been supplied. Please pay particular attention to: tabulated material (this may have been rekeyed); equations; numerical data; figures and graphics; and references. If you have not already indicated the corresponding author(s) please mark their name(s) with an asterisk. Please fax or e-mail your corrections to us. When returning the proof by fax please also include a list detailing the corrections to be made. If responding by e-mail please send only a list of corrections -do not make any changes directly to the pdf file.This proof reflects the content and general style of the paper without the stylistic complexity of the final printed page; however, the only differences should be minor layout changes such as different line breaks, tables being double column instead of single column and improvements in graphic placement.We will endeavour to publish the article electronically on the RSC web site as soon as possible after we receive your corrections. NB: No late corrections can be made hence please ensure that only your final corrections are notified to us.Please return your final corrections, where possible within 48 hours of receipt, to:Serials Production, The Royal Society of Chemistry, Tel: +44 (0)1223 432345; Fax: +44 (0)1223 432160; E-mail: proofs@rsc.org Reprints -Electronic (PDF) reprints will be provided free of charge to the corresponding author. Enquiries about purchasing paper reprints should be addressed to: Production Operations Department (prodops@rsc.org). Costs for reprints are below: = An example of commercially important binary polymer blends is that of PC-PBT composites. The current knowledge of the physical, mechanical and chemical properties of these blends is reviewed and updated in the light of interpretations based on Lewis acid-base intermolecular interactions, as quantified by inverse gas chromatography, carried out under infinite dilution conditions. Reprint costs

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Controlled Transesterification and Its Effects on Structure Development in Polycarbonate–Poly(Butylene Terephthalate) Melt Blends

Cited by 25 publications

References 34 publications

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Crystallization of Poly(ethylene terephthalate) in Poly(ethylene terephthalate)/Bisphenol A Polycarbonate Block Copolymers: Influence of Block Length and Role of the Rubbery Amorphous Component

Polymer blends: the PC–PBT case

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