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This Is The Blog For Roofing-Polycarbonate-Sheets-Domes-Sheds-In-Amritsar-Punjab-India
Structure And Fitting
Polycarbonates received their name because they are polymers containing carbonate groups (–O–(C=O)–O–). Most polycarbonates of commercial interest are derived from rigid monomers. A balance of useful features including temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering plastics.
The main polycarbonate material is produced by the reaction of bisphenol A and phosgene COCl2. The
(HOC6H4)2CMe2 + 2 NaOH → (NaOC6H4)2CMe2 + 2 H2O
overall reaction can be written as follows:
The first step of the synthesis involves treatment of bisphenol A with sodium hydroxide, which deprotonates the hydroxyl groups of the bisphenol A.[4]
(NaOC6H4)2CMe2 + COCl2 → 1/n [OC(OC6H4)2CMe2]n + 2 NaCl
The diphenoxide ((NaOC6H4)2CMe2) reacts with phosgene to give a chloroformate, which subsequently is attacked by another phenoxide. The net reaction from the diphenoxide is:
In this way, approximately one billion kilograms of polycarbonate is produced annually. Many other diols have been tested in place of bisphenol A, e.g. 1,1-bis(4-hydroxyphenyl)cyclohexane and dihydroxybenzophenone. The cyclohexane is used as a comonomer to suppress crystallisation tendency of the BPA-derived product. Tetrabromobisphenol A is used to enhance fire resistnce. Tetramethylcyclobutanediol has been developed as a replacement for BPA.[4]
An alternative route to polycarbonates entails transesterification from BPA and diphenyl carbonate:
We are manufacturer and supplier of polycarbonate sheets. We produce the sheets in different sizes colours, shape, depth and pitch as per the requirement of the customer. These are widely applicable for kitchens, cabinetry, furniture, airports, doors, shopping malls, office, hotels and many more places. These sheets provide aesthetic and elegant look to the interiors & exteriors. We also sell customized solution of these sheets as per the client’s requirement.
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New Fibre House,Amritsar,Punjab,India.
This Is The Blog For Roofing-Polycarbonate-Sheets-Domes-Sheds-In-Amritsar-Punjab-India
Structure And Fitting
Polycarbonates received their name because they are polymers containing carbonate groups (–O–(C=O)–O–). Most polycarbonates of commercial interest are derived from rigid monomers. A balance of useful features including temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering plastics.
Production
The main polycarbonate material is produced by the reaction of bisphenol A and phosgene COCl2. The
overall reaction can be written as follows:
The first step of the synthesis involves treatment of bisphenol A with sodium hydroxide, which deprotonates the hydroxyl groups of the bisphenol A.[4]
The diphenoxide ((NaOC6H4)2CMe2) reacts with phosgene to give a chloroformate, which subsequently is attacked by another phenoxide. The net reaction from the diphenoxide is:
In this way, approximately one billion kilograms of polycarbonate is produced annually. Many other diols have been tested in place of bisphenol A, e.g. 1,1-bis(4-hydroxyphenyl)cyclohexane and dihydroxybenzophenone. The cyclohexane is used as a comonomer to suppress crystallisation tendency of the BPA-derived product. Tetrabromobisphenol A is used to enhance fire resistnce. Tetramethylcyclobutanediol has been developed as a replacement for BPA.[4]
An alternative route to polycarbonates entails transesterification from BPA and diphenyl carbonate:
- (HOC6H4)2CMe2 + (C6H5O)2CO → 1/n [OC(OC6H4)2CMe2]n + 2 C6H5OH
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If you like my Blog Please Visit http://newfibrehouse.com
With thanks,
New Fibre House,Amritsar,Punjab,India.
Polycarbonate provide you with an unparalleled view of the sky while protecting you from the adverse effects of too much exposure to sunlight and its harmful UV rays.
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