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 authors used the three point bending method and the variation of stress with the immersion time at constant strain to evaluate the chemical attack of amorphous polycarbonate in isopropyl alcohol, ethylene glycol monomethyl ether and methanol.
46 citations
TL;DR: In this article, the thermal expansion of polymers was investigated from 4.2 K to room temperature, using an inductive dilatometer and a weakly cross-linked epoxy resin.
46 citations
TL;DR: In this paper, the effect of the [dtilde-relaxation on tensile properties was investigated for amorphous polyethylene terephthalate and polycarbonate and three regimes in tensile behavior were distinguished and the transitions between these regimes are correlated with molecular relaxation processes.
Abstract: Tensile behavior over the temperature range 4.2 to 350°K is reported for amorphous polyethylene terephthalate and polycarbonate. Three regimes in tensile behavior are distinguished and the transitions between these regimes are correlated with molecular relaxation processes. The [dtilde]-process at about 50°K is associated with the onset of anelasticity in the stress strain behavior. Below the β-temperature, fracture stresses fall off markedly with decreasing temperature, suggesting that stress concentration effects are active. The effect of the [dtilde]-relaxation on tensile properties is more pronounced in polycarbonate than in polyethylene terephthalate and agrees with the relative relaxation peak intensities. Over the gamma relaxation region, 170 to 200°K, there occurs a broad drop in yield stress in polycarbonate. In polyethylene terephthalate a transition from brittle to yield behavior is observed. Crazing occurs in both polymers over two distinct temperature regimes, one over an approximate...
46 citations
TL;DR: In this paper, two functional cyclic carbonate monomers, 5-methyl-5-methoxy carbonyl-1,3-dioxan-2-one and 5methyl- 5-ethoxy carbononyl -1, 3-dimethyl-hexanoate, were synthesized starting from 2,2-bis(hydroxymethyl) propionic acid and their molecular weight was measured by gel permeation chromatography.
Abstract: Two, functional, cyclic carbonate monomers, 5-methyl-5-methoxycarbonyl-1,3-dioxan-2-one and 5-methyl-5-ethoxy carbonyl-1,3-dioxan-2-one, were synthesized starting from 2,2-bis(hydroxymethyl) propionic acid. The ring-opening polymerization of the cyclic carbonate monomers in bulk with stannous 2-ethylhexanoate as a catalyst under different conditions was examined. The results showed that the yield and molecular weight of polycarbonates were significantly influenced by the reaction conditions. The polycarbonates obtained were characterized by IR, 1H NMR, and differential scanning calorimetry. Their molecular weight was measured by gel permeation chromatography. The in vitro biodegradation and controlled drug-release properties of the polycarbonates were also investigated. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 4001–4006, 2003
46 citations
TL;DR: In this article, the relationship between the molecular weight and several thermal properties of 2,2-bis(4-hydroxy-phenyl)propane polycarbonate is reported.
46 citations