BACKGROUND :- These resins are Thermoplastic Polymers manufactured by copolymerization of cyclic terpene hydrocarbon (like Pinene‚ Carene etc.) and phenol. There are various grades of this resin with softening points ranging from 70 - 110C. These resins are compatible with Natural and Synthetic Rubbers‚ Rosin‚ Alkyd resins‚ and most of the plasticizers and waxes. Applications are in the manufacture of tubes‚ tyres‚ gaskets‚ cables‚ pressure sensitive adhesives‚ hot melt adhesives‚ surgical
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nucleic acid that is basis of genetic information. It is like a set of instructions for our bodies and genetic codes. DNA has many different components that make it up such as hydrogen‚ oxygen‚ nitrogen‚ and phospurous. The structure has two long polymers of a simple unit called nucleotides. Holding the back of the structure is sugar and phosphate which are attached by ester bonds. Bonded to each sugar is 4 different types of molecules called bases. The backbone of the dna is where the genetic information
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nature. Many technologies exist today that allow for such treatment. Currently there are some synthetic polymers that can be broken down by microorganisms such as polycaprolactone‚ others are polyesters and aromatic-aliphatic esters‚ due to their ester bonds being susceptible to attack by water. Some examples of these are the natural poly-3-hydroxybutyrate‚ the renewably derived polylactic acid‚ and the synthetic polycaprolactone. Others are the cellulose-based cellulose acetate and celluloid (cellulose
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OF JUTE & ALLIED FIBRES Dr. S. K. Chakrabarti Indian Jute Industries’ Research Association (IJIRA) 17 Taratola Road‚ Kolkata- 700088 Abstract: In the present scenario‚ the growing concerns among the people globally against the use of synthetic polymers‚ toxin liberating substances and non-biodegradable products‚ because of their hazardous after effects on environment and human health‚ re-established the needs of natural fibres to our society in terms of packaging and daily use products. Jute
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type of man-made plastic that has been produced and has ended up in our ocean and has not been recycled. History of Plastic "Plastic" entered the world through chemistry in 1909 and was originally coined to describe Bakelite‚ the first fully synthetic resin. What make’s plastic so unique is when it is heated it can be molded but it retained its shape when cooled (Reddy‚ 2010). The modern plastic bag was not possible until the accidental discovery of the first industrially practical method of polyethylene
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research [2-4] confirmed that esophageal stent implantation for esophageal benign stricture can achieve satisfactory results. Metal and polymer stents are now the most widely used
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(a) Rational Numbers (b) Exponents and Powers Prepare a PPT on the Topic Rational numbers. Do the given sums in your practice copy. Physics: - Make a PPT on Force and Pressure. Do the given questions in fair copy. Chemistry:- Make a PPT on Synthetic fibers‚ polymers‚ plastics‚ etc illustrating their preparations‚ composition‚ advantages and disadvantages. Do the given questions in fair copy. Biology: - Complete the Apprentice work of ‘Crop’ Production and Management (as discussed in class). Make a PPT
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Bob is a piece of artwork created by chuck close in 1970 in the united states. A synthetic polymer white and black painting on canvas.It is one of the one of series of eight large black and white portraits that Close painted between 1967 and 1970. THe subject if this painting is Robert Israel one of the CLose’s friend‚ a new york based opera designer Chuck Close uses a girding technique . THe effect of this technique is that the artwork almost looks exactly as the original. he took a photo of
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petrochemical refineries. • Olefin petrochemical complex. • Aromatic petrochemical complex. 2.2 Natural gas based chemicals. 2.3 Alternative feedstocks for the production of commodity chemicals. 2.4. Feedstocks derived from metallurgical plants and polymers‚ materials technology and metallurgical processes. 2.5 Other mineral based projects consisting of acid and alkali industries‚ cement and glass plants based on limestone‚ gypsum‚ rock salt‚ sulphur and silica. 2.6 Agro based feed stocks. 2
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------------------------------------------------- Liquid–liquid extraction From Wikipedia‚ the free encyclopedia Liquid–liquid extraction also known as solvent extraction and partitioning‚ is a method to separate compounds based on their relative solubilities in two different immiscible liquids‚ usually water and an organic solvent. It is an extraction of a substance from one liquid into another liquid phase. Liquid–liquid extraction is a basic technique in chemical laboratories‚ where it is performed
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