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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 brittle fracture surfaces of polycarbonate consist of four distinct regions and the size of the regions and prominence of the features changed as the molecular weight decreased, indicating that whenever the degradation mechanism is a molecular weight reduction, toughness will be affected before the strength properties are lost.
Abstract: Polycarbonate tensile bars were aged up to 18 months at 0%, 75%, and 100% relative humidity and temperatures of 65–93°C. In the humid aged samples hydrolysis caused progressive reductions in molecular weight. Below a critical molecular weight (Mw = 33,800, Mn = 14,300) tensile strength dropped off rapidly. A transition from ductile to brittle failure was also observed at that point. Extrapolations indicate that the ductile–brittle transition at 38°C will be reached after 5 years at 100% relative humidity for the polycarbonate studied. Elongation was affected even in the early stages of hydrolysis. This suggests that whenever the degradation mechanism is a molecular weight reduction, toughness will be affected before the strength properties are lost. Mechanical properties are affected by annealing and antiplasticization which reduce localized stresses and increase short-range order. The brittle fracture surfaces of polycarbonate consist of four distinct regions. The size of the regions and the prominence of the features changed as the molecular weight decreased.

73 citations

Journal ArticleDOI
TL;DR: In this paper, a shape-stabilized stearic acid/polycarbonate (SA/PC) microcapsule was used as a new kind of phase change material (PCM) for thermal energy storage.

73 citations

Journal ArticleDOI
TL;DR: Vinyl ethylene carbonate is used as a new solid electrolyte interface (SEI)-forming additive for Li-metal anodes in carbonate-based electrolyte, which has the advantages of both good storage performance and low price.
Abstract: We report the use of vinyl ethylene carbonate as a new solid electrolyte interface (SEI)-forming additive for Li-metal anodes in carbonate-based electrolyte, which has the advantages of both good storage performance and low price. Compared to the SEI formed in vinyl ethylene carbonate-free electrolyte, the SEI film formed in 10% vinyl ethylene carbonate electrolyte contains a higher relative content of polycarbonate species and a greater amount of decomposition products of LiPF6 salt. Both components are expected to have positive effects on the passivation of Li-metal surface and the accommodation of volume changes of anode during cycling. Scanning electron microscopy images and COMSOL numerical simulation results further confirm that uniform Li deposition morphology can be achieved in the presence of vinyl ethylene carbonate additive. When cycling at the current density of 0.25 mA cm–2 with a cycling capacity of 1.0 mAh cm–2, the vinyl ethylene carbonate-contained Li–Cu cell exhibits a long life span of ...

73 citations

Journal ArticleDOI
TL;DR: In this article, the phase segregation at the surface of Bisphenol A polycarbonate (PC) and poly(methyl methacrylate) (PMMA) blends is studied by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF SIMS).
Abstract: Phase segregation at the surface of Bisphenol A polycarbonate (PC) and poly(methyl methacrylate) (PMMA) blends is studied by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF SIMS). Blends with different compositions were solution-casted onto silicon wafers with dichloromethane (CH(2)CL(2)) as the mutual solvent. A sharp PMMA segregation is observed at the surface of the blends. In fact, the quantitative analysis of the XPS data shows that the PMMA surface molar concentration increases first steeply with the PMMA bulk concentration (the surface concentration reaches 70% of PMMA for a 2.5% bulk concentration), and then it continues to increase slowly and saturates for a 38.8% hulk concentration. The ToF SIMS results show that PC remains detected even for high PMMA surface concentration. A semiquantitative ToF SIMS analysis is also presented, which correlated with the XPS results and confirmed the segregation even if matrix effects are detected when the surface concentration of each polymer is comparable. The segregation is explained by the difference of surface tension between the two polymers. The surface morphology is also sampled by the ToF SIMS imaging mode, but no contrast is detected although optical images reveal a two-phase system in the bulk.

73 citations

Patent
22 Sep 2003
TL;DR: In this paper, a process of selective inhibition of bonding (SIB) to produce three-dimensional objects is used to obtain high-quality moldings, which can be produced by using pulverulent materials which have a median particle size of from 10 to 200 μm in which at least one polymer or copolymer selected from polyester, polyvinyl chloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, polymethyl methacrylate (PMMA), PMMI, ionomer, polyamides, copolyester
Abstract: A process of selective inhibition of bonding (SIB) to produce three-dimensional objects is used to obtain high-quality moldings. High-quality moldings can be produced by using pulverulent materials which have a median particle size of from 10 to 200 μm in which at least one polymer or copolymer selected from polyester, polyvinyl chloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, polymethyl methacrylate (PMMA), PMMI, ionomer, polyamides, copolyester, copolyamides, terpolymers, or ABS, or a mixture of these, is present.

73 citations


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