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Polycarbonate Sheet Bible Make You An Expert In 100 …
It was clarified that the synthesis of polycarbonate from tetrachlorobisphenol A could be carried out in the same way as in the case of bisphenol A except for using of a suitable catalyst during blow of phosgene. Also, the synthesis of polycarbonates from diallyl-bisphenol-A, and bisphenol-B, -C, amixture of-A and-B could be made under the same condition as in the case of bisphenol A. However, polycarbonates from bisphenol B and C, differing from that of bisphenol A, showed infinite solubility in solvents of high boiling point, such as xylene. The new hard and transparent polymer was also obtained by heating diallyl carbonate of xylylene glycol with a small amount catalyst.
Polycarbonate can be synthesized from bisphenol A and (carbonyl dichloride, COCl2). The first step in the synthesis of polycarbonate from bisphenol A is treatment of bisphenol A with . This deprotonates the of the bisphenol A .
Bisphenol A | European Food Safety Authority
Other Forms of Synthesis
Various Other Methods Exist
Aims to Reduce Toxic Byproduct, speed up reaction, increase molecular weight while maintaing mechanical properties
Solid State Polymerization (SSP)
Smaller polymer particles advantageous for synthesizing high molecular weight polycarbonate
Molecular weight distribution is no longer an issue
Nitrogen is an effective sweep fluid for high molecular weight but falls short to carbon dioxide
Greater degree of chain extension reaction present with higher temperature and pressure of the supercritical sweep fluid, carbon dioxide
Rapid flow rate of supercritial fluid results creates higher degree of chain extension reactions over slow flow rates
Conclusion of Experiment:
Applications of Polycarbonate
Polycarbonate Impact Strength Demonstration
Polycarbonate design: Makrolon 1/4" polycarbonate sheet
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Solid State Polymerization (SSP)
Experiment conducted by scientists at Department of Chemistry, University of North Carolina
Research experiment- not a commercially used method of synthesis
, issue 34 (2001)
Bisphenol A (BPA) and Diphenyl Carbonate (DPC) are recrystallized and dried in a vacuum
Prepolymer synthesized by step growth polymerization of BPA and DPC using an aqueous solution of LiOH as the initiator
Molecular weight of the prepolymer depends on the removal of the by-product phenol, which is done by using a vacuum or flowing an inert gas through the system
Prepolymer is collected and ground into small particles; SEM determines particle sizes
Prepolymer is then induced with supercritical carbon monoxide gas to induce crystallization, typically via a high-pressure vessel
Crystallinity can be determined by differential scanning calorimerty (DSC)
3 types of Bullet-resistant "glass"
Polycarbonate and Glass
"Feature Story." Baxter U.S.: Small in Stature: New Technology from Baxter Makes an Impact.
Phosgene is the chemical compound with the formula COCl 2
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