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Polycarbonate

About: Polycarbonate is a research topic. Over the lifetime, 14032 publications have been published within this topic receiving 141740 citations. The topic is also known as: PC & Polycarbonate, PC.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the effects of hydrostatic pressure (up to 100,000 psi) on the stress-strain behavior of a highly crystalline polymer (polytetrafluoroethylene) and an amorphous polymer(polycarbonate) have been determined.

71 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed cellulose-nanofibril-film-reinforced polycarbonate composites by compression molding, which were characterized in terms of strength properties, crystallinity, and thermal properties.
Abstract: The aim of this study was to develop cellulose-nanofibril-film-reinforced polycarbonate composites by compression molding. Nano fibres were prepared from wood pulp fibres by mechanical defibrillation, and diameter distribution of the fibres produced was in the range of 1–100 nm. Nanofibre films were prepared from the nanofibre suspensions and were characterized in terms of strength properties, crystallinity, and thermal properties. Strength and modulus of the nano fibre films prepared were 240 MPa and 11 GPa, respectively. Thermal properties of the sheets demonstrated the suitability of processing fibre sheets at high temperature. Tensile properties of the films subjected to composite-processing conditions demonstrated the thermal stability of the fibre films during the compression molding process. Nanocomposites of different fibre loads were prepared by press-molding nano fibre sheets with different thickness in between polycarbonate sheet at 205°C under pressure. The tensile modulus and strength of the polycarbonate increased with the incorporation of the fibres. The strength of the thermoplastic increased 24% with 10% of the fibres and is increased up to 30% with 18% of the fibres. Tensile modulus of the polycarbonate demonstrated significant enhancement (about 100%).

71 citations

Journal ArticleDOI
TL;DR: In the absence of significant tranesterification, blends of poly(ethylene terephthalate) and poly(bisphenol-A carbonate) were found to be almost completely immiscible over the range of compositions studied as discussed by the authors.
Abstract: In the absence of significant tranesterification, blends of poly(ethylene terephthalate) and poly(bisphenol-A carbonate) were found to be almost completely immiscible over the range of compositions studied. Although the observed behavior was sometimes erratic, poly(bisphenol-A carbonate) appears to exert a significant influence on PET melting behavior and normalized heat of fusion.

71 citations

Patent
12 Nov 2002
TL;DR: The branch-inducing catalysts at the later stages of the process produced a branched polycarbonate composition having longer chains between the branching points, and thus a new composition was produced as discussed by the authors.
Abstract: The invention relates to a method for the production of a branched polycarbonate composition, having increased melt strength, by late addition of branch-inducing catalysts to the polycarbonate oligomer in a melt polycondensation process. Surprisingly, it has been found that by adding branch-inducing catalysts, such as alkali metal compounds and/ or alkaline earth metal compounds, to the melt polycarbonate oligomer at a later stage of the melt polycondensation process, preferably after the oligomer has reached an average molecular weight of between about 3,000 and 30,000 g/mole, a unique branched polycarbonate composition is formed that has improved properties. It is believed that the addition of the branch-inducing catalysts at the later stages of the process produces a branched polycarbonate composition having longer chains between the branching points, and thus a new composition is produced. The invention also relates to various applications of the branched polycarbonate composition.

71 citations

Journal ArticleDOI
TL;DR: In this paper, an assignment of the bands conformationally sensitive to the trans−trans and cis−trans structures is proposed based on the spectroscopic analysis and ab initio quantum mechanical calculations of diphenyl carbonate as a model compound.
Abstract: Ordered structures in samples of Bisphenol A polycarbonate (BPAPC) prepared by varying thermal and solvent conditions were investigated by infrared and Raman spectroscopy, wide-angle X-ray scattering (WAXS), and differential scanning calorimetry (DSC). Based on the spectroscopic analysis and ab initio quantum mechanical calculations of diphenyl carbonate as a model compound, an assignment of the bands conformationally sensitive to the trans−trans and cis−trans structures is proposed. Temperature dependences of the vibrational spectra of BPAPC show that cis−trans structure is the energetically preferred conformation in the amorphous state and in solution and its population can be increased with decreasing temperature in amorphous BPAPC even below the glass transition temperature. Differences in the degrees of ordering in semicrystalline BPAPC assessed from the vibrational spectra, WAXS, and DSC indicate partial order in the interfacial region between the crystalline and amorphous phases. In some solvents (...

71 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023248
2022471
2021184
2020294
2019390
2018403