Topic
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.
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TL;DR: In this paper, the phase diagram of polycarbonate (PC)/polymethyl methacrylate (PMMA) mixtures was established by means of a cloud point method and reminiscent of lower critical solution temperature (LCST) in character.
Abstract: Solvent-cast films of polycarbonate (PC)/polymethyl methacrylate (PMMA) mixtures exhibit a single-phase structure with outstanding optical clarity Differential scanning calorimetry (DSC) studies show a single glass transition in the intermediate blends However, the blends undergo phase separation upon heating above 240°C The phase diagram has been established subsequently by means of a cloud point method and is reminiscent of lower critical solution temperature (LCST) in character
52 citations
TL;DR: Suzuki polycondensation afforded a high-molar-mass poly(meta-phenylene) (see structure) which displays not only outstanding toughness, convenient processability, and a high glass-transition temperature, but also considerable resistance against environmental stress-cracking; thus, it rivals high-performance polycarbonate in its fundamental properties.
Abstract: Challenging commercial polycarbonate: Suzuki polycondensation afforded a high-molar-mass poly(meta-phenylene) (see structure) which displays not only outstanding toughness, convenient processability, and a high glass-transition temperature, but also considerable resistance against environmental stress-cracking; thus, it rivals high-performance polycarbonate in its fundamental properties.
52 citations
Patent•
05 Dec 2013
TL;DR: A thermoplastic resin composition comprises (A) about 30 to about 98 wt % of a polycarbonate resin, (B) about 1 to about 50 wt percent of a rubber modified acrylic-based graft copolymer, and (C) about 0.1 to 0.2 wt% of a branched copolymers including silicon-based compound as mentioned in this paper.
Abstract: A thermoplastic resin composition comprises (A) about 30 to about 98 wt % of a polycarbonate resin, (B) about 1 to about 50 wt % of a rubber modified acrylic-based graft copolymer, and (C) about 1 to about 69 wt % of a branched copolymer including silicon-based compound. A molded article can be made using the same.
52 citations
TL;DR: In this article, the ages of polysulfone, polycarbonate, and phenoxy resins were aged under thermal and ultraviolet light conditions, and only minor losses in these materials below 125°C were reported.
Abstract: Polysulfone, polycarbonate, and phenoxy resins were aged under thermal and ultraviolet light conditions. Thermoxidative processes in polysulfone and polycarbonate are of such minor significance as not to impart noticeable losses in these materials below 125°C. In phenoxy, however, thermal oxidation above 100°C results in rapid deterioration of all physical properties. This probably results from the low glass transition temperature of this polymer. Photo-oxidation rapidly degrades polysulfone. This appears to be a consequence of scission at the sulfone link. In polycarbonate, however, the only serious result of short-term irradiation is discoloration. For phenoxy resin, crosslinking through reactions at the hydroxyl group is the principal result of photo-oxidation. In all processes the bisphenol A portion of the three polymers appears to play only a small role.
52 citations
TL;DR: The gas-transport properties of several polymer-ceramic composite membranes with glassy polymer layers having effective thicknesses of approximately 4000 A exhibit strongly time-dependent behavior.
Abstract: The gas-transport properties of several polymer-ceramic composite membranes with glassy polymer layers having effective thicknesses of approximately 4000 A exhibit strongly time-dependent behavior. The membranes, prepared from polyimide and polycarbonate, demonstrated decreases in gas flux of 40-60% in the first 20 days following manufacture. The pure-gas selectivity of these membranes for the He/N 2 separation increased over the same period to values approximately 50% higher than those of a thick film of the same material. Substructure compaction of these membranes is nonexistent, unlike integral-symmetric polymeric membranes, so transport property changes are less ambiguous to interpret. We suggest a true glassy state drift in the properties of the selective layer of the composite membranes as the cause for the observations. The observations show that transport properties determined on thick films of glassy polymers may differ significantly from the properties of thin, gas permeation membranes
52 citations