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Date: 25-2-2016
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Date: 26-9-2017
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Date: 24-9-2017
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Group of polyesters
Polyesters are polymers in which the bonds between the monomers occur via ester groups. There are many types of natural esters, and their degrading enzymes – the esterases – are present everywhere, together with the living organisms. The ester bonds are generally easy to hydrolyze. The group of biodegradable polyesters mainly consists of: a) linear aliphatic (i. e., non-aromatic) polyesters, such as polyglycolic acid (PGA) and poly (ℇ- caprolactone) (PCL); b) aliphatic polyesters with short chain branching, such as polylactic acid (PLA), poly (3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and c) aliphatic-aromatic polyesters such as poly(butylene succinate-coterephthalate) (PBST) and poly(butylene adipate-co-terephthalate) (PBAT).
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كيف تساهم الأطعمة فائقة المعالجة في تفاقم مرض يصيب الأمعاء؟
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مشروع ضخم لإنتاج الهيدروجين الأخضر يواجه تأخيرًا جديدًا
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المجمع العلمي يختتم دورته القرآنية في فن الصوت والنغم بالطريقة المصرية
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