Addition Copolymerization

Most direct copolymerizations of equimolar mixtures of different monomers give statistical copolymers, or if one monomer is much more reactive a nearly homopolymer of that monomer. The copolymerization of styrene with methyl methacrylate, for example, proceeds differently depending on the mechanism. Radical polymerization gives a statistical copolymer. However, the product of cationic polymerization is largely polystyrene, and anionic polymerization favors formation of poly(methyl methacrylate). In cases where the relative reactivities are different, the copolymer composition can sometimes be controlled by continuous introduction of a biased mixture of monomers into the reaction.

Formation of alternating copolymers is favored when the monomers have different polar substituents (e.g. one electron withdrawing and the other electron donating), and both have similar reactivities toward radicals. For example, styrene and acrylonitrile copolymerize in a largely alternating fashion.

A terpolymer of acrylonitrile, butadiene and styrene, called ABS rubber, is used for high-impact containers, pipes and gaskets.

مواضيع ذات صلة

التآكل الفيزيائي للبوليمرات polymer Erosion

أدوية قابلة على التبلمر Drug are on the Polymerization

أدوية محملة على البوليمرات Drugs loaded on polymers

تقنيات الربط بين الدواء و البوليمر Techniques to link the drug and Polymer

البوليمرات الصناعية Synthetic polymers

البوليمرات الطبيعية Natural polymers

دور البوليمرات في أنظمة أطلاق الدواء المسيطر عليه

العوامل المؤثرة على التحلل الحياتي للبوليمرات

البوليمرات القابلة على التحلل الحياتي Bio-Degradable

البوليمرات غير القابلة على التحلل الحياتيNon bio-Degradable

خواص تحلل البوليمر Analyse the properties of the polymer

الديواكس Dowex 50wxg