HIGH POLYMER
HIGH POLYMER
- High Polymers are formed by polymerization of monomers.
- A high polymer is chemically described by its degree of polymerisation, molar mass distribution, tacticity, copolymer distribution, the degree of branching.
- High Polymers in solution have special characteristics with respect to solubility, viscosity and gelation.
FLOW SHEET MANUFACTURING DIAGRAM OF NYLON IN HIGH POLYMER
- Polyamides or nylons are the first engineering plastics and still represent the biggest and most important class of these types of material.
- The original “nylon” which was conducted by Wallace H. Carothers in a DuPont Laboratory in 1935.
- commercially important polyamide, nylon 6 based on caprolactam was first produced at IG Farbenindustrie in Germany by P. Schlack in 1938
- Nylon 6 and nylon 6,6 continue to be the most popular types among polyamide commercial.
- Two basic reactions are used to synthesize polyamide engineering polymers are :- polycondensation of a dibasic acid and a diamine or
polymerization of an amino acid or lactam
- Major properties such as resistance to chemicals, toughness, thermal stability, good appearance, and good processability are key considerations that make nylon suitable for engineering plastics applications.
- nylon 6 has better toughness and processability.
- On the other hand, nylon 6,6 has superior mechanical properties and higher heat resistance.
CHEMISTRY OF HIGH POLYMER
- Nylon 6 is the linear addition polymer of caprolactam (6-amino-caproic acid).
- The polymerization process for nylon 6 can be batch or continuous.
- Three reversible reactions,ie, hydrolysis, polycondensation, and polyaddition are the main steps in nylon 6 production.
The first step is a hydrolysis reaction to open the caprolactam ring, forming ε-aminocaproic acid
IMPORTANT QUESTION
Q.1 What do you mean by high polymer?
ANS/ High Polymers are formed by polymerization of monomers.
- A high polymer is chemically described by its degree of polymerisation, molar mass distribution, tacticity, copolymer distribution, the degree of branching.
- High Polymers in solution have special characteristics with respect to solubility, viscosity and gelation.
Q2 Describe the flow sheet diagram of nylon ?
ANS/
- Polyamides or nylons are the first engineering plastics and still represent the biggest and most important class of these types of material.
- The original “nylon” which was conducted by Wallace H. Carothers in a DuPont Laboratory in 1935.
- commercially important polyamide, nylon 6 based on caprolactam was first produced at IG Farbenindustrie in Germany by P. Schlack in 1938
- Nylon 6 and nylon 6,6 continue to be the most popular types among polyamide commercial.
- Two basic reactions are used to synthesize polyamide engineering polymers are :-
(1) polycondensation of a dibasic acid and a diamine or
(2) polymerization of an amino acid or lactam
- Major properties such as resistance to chemicals, toughness, thermal stability, good appearance, and good processability are key considerations that make nylon suitable for engineering plastics applications.
- nylon 6 has better toughness and processability.
- On the other hand, nylon 6,6 has superior mechanical properties and higher heat resistance.
This is a good article where about high polymer is described…
High Polymer finds extensive use, nowadays. This article explains the manufacturing & oher aspects of this polymer.