CHEMISTRY TEXTBOOK

15.2.6 Classification of polymers on the basis of biodegradability : Most of the synthetic polymers are not affected by microbes ...

Do you know? Vulcanizing is carried out by heating raw rubber with sulfur powder in presence of some organic compounds called ac ...

a. Low density polyethylene (LDP) : LDP is obtained by polymerization of ethylene under high pressure (1000 - 2000 atm) and temp ...

Do you know? Orlon is used to make blankets, shawls, sweat shirts, sweaters. C - F bond is very difficult to break and remains u ...

Polycarbonates are also a kind of polyester polymers. These are high melting thermosetting resins. 15.3.7 Phenol - formaldehyde ...

OH CH 2 OH Stage 2 : (Novolac) OH CH 2 OH CH 2 OH H⊕ H^2 C CH^2 n -H 2 O Stage 3 : (Bakelite) Novolac CH 2 CH 2 CH 2 CH 2 OH OH ...

15.3.8 Buna-S rubber : Buna-S is an elastomer which is a copolymer of styrene with butadiene (Fig.15.5). Its trade name is SBR ( ...

Can you tell? Classify the following polymers as addition or condensation. i. PVC ii. Polyamides iii. Polystyrene iv. Polycarbo ...

15.5 Biodegradable polymers : Problem 15.2 : The critical degree of polymerization is low for nylon 6 while high for polythene. ...

15.6 Commercially important polymers : Apart from the polymers already discussed in this chapter, many more polymers are used ex ...

Choose the correct option from the given alternatives. i. Nylon fibres are ---- A. Semisynthetic fibres B. Polyamide fibres C. ...

vi. Match the following pairs : Name of polymer Monomer Teflon a. CH 2 =CH 2 PVC b. CF 2 =CF 2 Polyester c) CH 2 =CHCl Polythen ...

ii. Write the chemical reactions involved in manufacture of Nylon 6,6 iii. Explain vulcanisation of rubber. Which vulcanizing ag ...

GREEN CHEMISTRY AND NANOCHEMISTRY Can you recall? What do you mean by environment? Which are the factors affecting the enviro ...

Illustration : The concept of atom economy gives the measure of the unwanted product produced in a particular reaction. % atom e ...

energy, improving the technology of heating system, use microwave heating, .... , etc. Use of renewable feedstocks : The perspe ...

Design for degradation : Design chemicals that degrade and can be discarded easily. Ensure that both chemicals and their degrad ...

Real-time Analysis Pollution Prevention: Analytical methods need to be further developed to allow for real-time, in process mon ...

Fig. 16.1 Macro-materials to atoms ant 5 mm dust mite 200 mm human hair 10-50 mm wide DNA 2-12 nm diameter red blood cells 2-5 m ...

be nanoparticles, nanowires and nanotubes according to dimensions. Nanostructured materials may be large organic molecules, inor ...