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Showing 1 to 14 of 14 for “"Bisphenol-A polycarbonate"”.
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A Study of Crystallization in Bisphenol-A Polycarbonate
The crystallization behavior of bisphenol-A polycarbonate (BAPC) was studied, focusing on the initial stage of crystallization and the secondary stage of crystallization. Bisphenol-A polycarbonate was the polymer chosen for this study because of its slow crystallization rate. With slow …
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Crystallization Behavior of Bisphenol-A Polycarbonate: Effects of Crystallization Time, Temperature, and Molar Mass
Crystallization and multiple melting behavior of bisphenol-A polycarbonate (PC) was investigated using differential scanning calorimetry (DSC) for the monitoring of thermal behavior and atomic force microscopy (AFM) for the morphology study. The exceedingly slow crystallization kinetics of PC and …
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Synthesis and characterization of new polycarbonate material systems
Bisphenol A polycarbonate is an engineering thermosplastic which can be utilized for a variety of applications. Modifications to improve upon the properties of this useful material have been attempted since its invention. Three modifications of bisphenol A polycarbonate and its copolymers have been …
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SYNTHESES AND ESTROGENICITY STUDY OF DIETHYLSTILBESTROL AND BISPHENOL-A ANALOGS AS POTENTIAL REPLACEMENT FOR BISPHENOL-A AND INVESTIGATION ON NOVEL REACTIONS INDUCED BY IODANE/QUATERNARY AMMONIUM HALIDES
… than that of DES. Non-estrogenic analogs of bisphenol-A were designed based on the observation that (15) is far less estrogenic than DES. Closed ring analogs of bisphenol-A, 3,6-dihydroxy-9,9-dimethylfluorene (34), 2,6-dihydroxy-9,9-dimethylfluorene (35), and 2,7-dhydroxy-9,9-dimethylfluorene …
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Engineering properties of multiphase block copolymers
Multiblock [-A-B-]<sub>n</sub> copolymers of bisphenol-A polycarbonate (I) and several poly(arylether sulfones) (II) have been investigated. The copolymers [see document for a diagram of copolymers (I) and (II)] were prepared from hydroxyl terminated oligomers (4,000 < M̅<sub>n</sub> < 30,000) by …
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Thermal Degradation Studies of Polycarbonate
… is beneficial. The current study focuses on bisphenol A polycarbonate and tracks changes in the properties of this material as a function of the degree of degradation, t. For the purposes of the present research, the environmental effects have been limited to those associated with elevated …
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The effects of molecular orientation on the physical aging behavior of oriented glassy amorphous polymers
… To measure the aging behavior, samples of bisphenol A polycarbonate and atactic polystyrene were hot drawn (i.e. stretched above T<sub>g</sub>) to varying stretch ratios and the degree of orientation quantified using birefringence and the Herman’s orientation function, f. Physical aging …
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Structure-Property Relationships of Polyester Regioisomers and Pendant Functionalized Polyetherimides
… tensile and flexural modulus/strength, rivaling bisphenol-A polycarbonate (BPA-PC). Replacement of EG with 1,4-cyclohexanedimethanol (CHDM) improved thermal properties closer to BPA-PC, while enabling melt rheological analysis due to its amorphous morphology. Time-temperature superposition (TTS) …
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Gas transport properties in polycarbonate - Influence of the cooling rate, physical aging, and orientation
… process. The gas transport properties of bisphenol-A polycarbonate films were examined as a function of the cooling rate, physical aging, and orientation. Such conditions affect the free volume content and its size and shape distribution. Results obtained from permeation experiments were …
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Crystallization behavior and structure property behavior of selected thermoplastic polymers
… temperatures. Thermal and mechanical behavior of bisphenol-A polycarbonate was studied as a function of thermal history and absorbed mass fraction of C0₂. Mechanical testing and gas absorption experiments were performed on physically aged and unaged polycarbonate. Gas absorption studies indicated …
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Synthesis and characterization of polycarbonate-polydimethylsiloxane block copolymers
Two methods for the preparation of bisphenol-A polycarbonate-polydimethylsiloxane multi-block or segmented copolymers have been investigated. The first is a solution reaction which utilized the interaction of a preformed, α,ω-dimethylamino terminated polydimethylsiloxane with a preformed, …
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An Experimental Approach to the Development and Validation of Group Interaction Modelling
… such as polyethylene, polystyrene, polycarbonate etc., over a narrow range of conditions and measured properties, related to their intended industrial applications. Hitherto, the predictive power of Group Interaction Modelling has therefore been hindered by its semi-empirical …