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 catalytic activity towards exchange reactions in poly(ethylene terephthalate) (PET)-bisphenol-A polycarbonate (PC) reactive blending was compared for various lanthanide compounds (based on europium, cerium, samarium, terbium and erbium), and for titanium-and calcium/antimony-based catalysts.
40 citations
TL;DR: In this paper, the through-thickness birefringent patterns of PMMA and polycarbonate are measured as a function of thickness, cooling rate, and annealing time.
Abstract: The through-thickness birefringent patterns (nx – nz) of PMMA and polycarbonate (PC) are measured as a function of thickness, cooling rate, and annealing time. A method is demonstrated for separating the elastic stress from the residual birefringence. The residual birefringence is explained as the residual orientation induced when cooling through the galss transition. The shape of the elastic (tempering) stress distribution is apparently independent of the cooling rate and annealing time, the choice of polymer, and the sheet thickness. The magnitude of the tempering stres is dependent on cooling rate but nearly independent of choice of polymer and sheet thickness. The decays of both the tempering stress and the residual orientation are measured as a function of annealing time at 120°C for polycarbonate. The measured birefringence decays only slightly; however, the elastic tempering stress reverts, on annealing, to permanent (anelastic) orientational strain. The tempering stress at the sheet surface is not an adequate criterion for defining toughness in polycarbonate.
40 citations
Patent•
01 Dec 1992TL;DR: In this article, the authors claim that polycarbonates have improved flow properties combined with at least equivalent heat resistance when compared to conventional polycarbonate used in optical data carriers (e.g. EP-213413).
Abstract: Polycarbonates of mol. wt. at least 10,000 are claimed, as are also optical data carriers consisting of such polycarbonates, the characteristic features of the polycarbonates being that they have: (i) Tg = 140 deg. C or above; and (ii) a 300 deg.C/1.2 kg load melt viscosity of at most 50 Pa.s. at 1000/sec. and at most 30 Pa.s. at 10,000/sec. ADVANTAGE - The polycarbonates have improved flow properties combined with at least equivalent heat resistance when compared to conventional polycarbonates used in optical data carriers (e.g. EP-213413). In an example, a suitable polycarbonate with Tg = 143 deg. C and 300 deg. C/1.2 kg melt viscosity = 49 (at 1000/sec.) and 26 (at 10,000/sec.) was obtd. using the following ingredients: 3004.3g bisphenol A; 217.3g 3,3,5-tri-Me-1,1-(4-hydroxy-phenyl)-cyclohexane; 48.3g isatin biscresol; 233.4g p-t.Bu-phenol; 2364g caustic soda soln.; 13l CH2CL2; 13cl PhCl; 35,400g water; 2216g CoCl2; and 15.4ml N-Et-piperidine.
40 citations
TL;DR: In this article, a dual mode MW/r.f. plasmas-enhanced chemical vapour deposition from silane was used to obtain superior abrasion resistance and thermal variation endurance.
40 citations
TL;DR: In this article, the physical and chemical interactions existing between the two blend components, tetraglycidyl-4,4'-diaminodiphenylmethane (TGDDM) and Bisphenol A polycarbonate (PC), were investigated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
Abstract: The physical and chemical interactions existing between the two blend components, tetraglycidyl-4,4'-diaminodiphenylmethane (TGDDM) and Bisphenol A polycarbonate (PC), were investigated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The homogeneous phase behavior, which was found to exist not only in the heated binary blends of TGDDM/PC with no curing agents but also in amine-cured blends, is believed to be a result of these special chemical links developed between the TGDDM epoxy and linear PC polymer molecules. Mechanisms of chemical reactions and the resulting links between these two components upon heating of the TGDDM/PC blends (in the absence of any curing agents) have been proposed and proven by experimental results.
40 citations