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Date: 2-10-2017
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Date: 12-1-2020
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Date: 26-1-2020
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Copolymerization is an invaluable tool for "tuning" polymers so that they have the right combination of properties for an application. For example, homopolymeric polystyrene is a rigid and very brittle transparent thermoplastic with a glass transition temperature of 97°C. Copolymerizing it with acrylonitrile yields an alternating "SAN" copolymer in which tg is raised to 107°, making it useable for transparent drink containers.
A polymer that is composed of identical monomeric units (as is polyethylene) is called a homopolymer. Heteropolymers are built up from more than one type of monomer. Artificial heteropolymers are more commonly known as copolymers.
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قلة النوم.. ضريبة ثقيلة على صحتك قد تهدد حياتك
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اكتشاف انبعاث غاز الميثان في القارة القطبية الجنوبية
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منها برامج إرشاديَّة وثقافيَّة.. شعبة التوجيه الديني النسوي تقدم خدمات متنوعة لزائرات النصف من شعبان
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