What catalyst is used in condensation polymerization?
What catalyst is used in condensation polymerization?
Catalysts commonly used in condensation reactions include acids, bases, the cyanide ion, and complex metal ions.
What is needed to form a condensation polymer?
Condensation polymers are formed by the removal of water (or alcohols) during polymerization and the final molecular weight of the polymer is controlled by the equilibrium concentration of water or alcohols in the molten polymer at the end of the polymerization.
What is photoinitiator polymer?
A photoinitiator is a molecule that creates reactive species (free radicals, cations or anions) when exposed to radiation (UV or visible). Synthetic photoinitiators are key components in photopolymers (i.e., photo-curable coatings, adhesives and dental restoratives).
What is condensation reaction in polymers?
In one type of polymerization reaction, a series of condensation steps takes place whereby monomers or monomer chains add to each other to form longer chains. This is termed “condensation polymerization,” or “step-growth polymerization,” and occurs in such processes as the synthesis of polyesters or nylons.
Which polymer is synthesized by condensation polymer?
Examples of naturally occurring condensation polymers are cellulose, the polypeptide chains of proteins, and poly(β-hydroxybutyric acid), a polyester synthesized in large quantity by certain soil and water bacteria.
Which polymer is prepared by condensation polymerization?
Condensation polymerization is used to make Dacron, Nylon-6.6, and Bakelite.
Is polyvinyl chloride a condensation polymer?
Generally, the PVC is a condensation polymer that has a pressure of 100 atmospheres at 200OC. The polyethylene has condensation polymers which are formed by the combination of monomer with the elimination of simple molecules such as H20 or CH3OH.
What are the two monomers used to make polyesters?
The two monomer units used in producing this polymer are 1,3-propanediol and terephthalic acid and its structure is shown in Fig. 4.10. Figure 4.10. Chemical structure of polytrimethylene terephthalate polyester.
Is AIBN a photoinitiator?
Azobisisobutyronitrile (AIBN) is used commonly as both a thermal and photoinitiator [12].
How do photoinitiators for UV curing work?
1) Photoinitiator absorbs UV light energy creating radicals. 2) Radicals react with acrylate monomers and oligomers inducing crosslinking. 3) Liquid resin system converts to dry/cured product on crosslinking. When irradiated with UV light energy the photoinitiator cleaves to generate radicals.
What are condensation polymers give two examples?
Examples of natural condensation polymers include cellulose, starch, and polypeptide chains of proteins. Several synthetic condensation polymers discussed include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes, epoxies.
Which one is a condensation polymer?
Dacron is a condensation polymer. It is also known as terylene.
