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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
01 Oct 1996-Polymer
TL;DR: In this article, an immiscible blend comprised of a crystalline polyethylene (polyethylene) and an amorphous polycarbonate (polycarbonate) component was studied and it was shown that the system PC dispersed in HDPE displays a tensile modulus which mimics theoretical behaviour for perfect adhesion even in the absence of an interfacial modifier.

102 citations

Patent
31 Mar 1998
TL;DR: In this paper, the objective is to obtain the objective aromatic polycarbonate by determining the ratio, etc., of hydroxy terminals to total terminals in a prepolymer in the reaction of a specific dihydroxydiaryl compound with a diaryl carbonate and additionally polymerizing the compound according to the determined result.
Abstract: PURPOSE: To obtain the objective aromatic polycarbonate by determining the ratio, etc., of hydroxy terminals to total terminals in a prepolymer in the reaction of a specific dihydroxydiaryl compound with a diaryl carbonate and additionally polymerizing the compound according to the determined result. CONSTITUTION: An aromatic polycarbonate having desired hydroxyl-terminal ratio and number-average molecular weight is produced in high efficiency by prepolymerizing (A) a dihydroxydiaryl compound composed of ≥60mol% of a dihydroxydiarylalkane of formula (Ar 1 and Ar 2 are arylene; Y is alkylene, etc.) and ≤40mol% of other dihydroxydiaryl compound and (B) a diaryl carbonate until the number-average molecular weight of the prepolymer reaches 1,000-10,000, determining the number-average molecular weight, the ratio of hydroxyl terminals and that of aryl carbonate terminals to total terminal groups, adding diaryl carbonate to the system when the hydroxyl terminal ratio is higher than the desired level or adding dihydroxydiaryl compound when the ratio is lower than the desired level and continuing the polymerization reaction. COPYRIGHT: (C)1991,JPO&Japio

102 citations

Journal ArticleDOI
TL;DR: Polymerisation de melange oxyde d'ethylene-carbone dioxyde (ethylene carbonate) en presence de dibutyl (ethylenedioxy) etain this article.
Abstract: Polymerisation de melange oxyde d'ethylene-carbone dioxyde (ethylene carbonate) en presence de dibutyl (ethylenedioxy) etain

102 citations

Journal ArticleDOI
TL;DR: In this paper, the mechanical and rheological properties of blends of a thermotropic liquid crystalline polyester with a polycarbonate have been investigated by performing solid state relaxation measurements and the relaxation modulus was also found to increase by the addition of LCP.
Abstract: Mechanical and rheological properties of blends of a thermotropic liquid crystalline polyester with a polycarbonate have been investigated. The blends are fibrillar in character and exhibit great hardness and toughness due to high degree of molecular orientation which develops during the melt blending and processing steps. Increases of the Young modulus by 100 percent are observed for blends containing only 10 percent of liquid crystalline polymer, LCP. Time-dependent behavior of the blends was investigated by performing solid state relaxation measurements and the relaxation modulus was also found to increase by the addition of LCP. The effect is relatively small in the glassy zone of viscoelastic response, but increases through the transition and viscous flow regions. The melt viscosity of the polycarbonate is slightly shear thinning whereas that of the unblended LCP increases rapidly with decreasing shear rate at low shear rate. This suggests the presence of yield stresses as confirmed by measurements on the Rheometics RSR in the stress sweep mode. The melt viscosity of the blends was found to be similar to that of the unblended polycarbonate, but more shear-thinning and less viscous. Preliminary results of scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) are also presented.

102 citations

Journal ArticleDOI
TL;DR: In this paper, cyclic carbonate functional polymers were prepared via the free radical solution copolymerization of vinyl ethylene carbonate with vinyl ester monomers, varying from 10 to 50%.

101 citations


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