Düşük Molekül Kütleli Polistirenlerin Asetik Anhidritle Kimyasal Modifikasyonu

Bu çalışmada, ilk olarak 350.000 molekül kütleli blok polistiren (PS) çözünme-çöktürme metodu kullanılarak fraksiyonlarına ayrılmıştır. Daha sonra 70.000, 80.000 ve 90.000 molekül kütleli PS fraksiyonlarının BF3.O(C2H5)2 katalizörlüğünde asetik anhidritle (AA) kimyasal modifikasyon reaksiyonları incelenmiştir. Ayrıca PS yapısına bağlanan fonksiyonel grup miktarının kıyaslanması için elde edilen yüksek molekül kütleli (Mn *= 290.000 ve 500.000) PS fraksiyonları da optimum şartta modifiye edilmiştir. PS yapısına bağlanmış fonksiyonel grup sayısı PS’nin molekül kütlesine bağlı olarak değişiklik göstermiştir ve daha düşük molekül kütleli PS’ye daha fazla fonksiyonel grup bağlanmıştır. PS yapısına bağlanan fonksiyonel gruplar ve miktarları spektral ve kimyasal metotlarla değerlendirilmiştir.

Anahtar Kelimeler:

Polistiren, asetik anhidrit, kimyasal modifikasyon, Friedel-Crafts açilasyonu

Chemical Modification of Polystyrenes with Low Molecular Weights with Acetic Anhydride

In this study, the first the block of polystyrene (PS) that have molecular weight of 350.000 was fractionized by using of solvent-precipitation methods, than chemical modification reactions of PS fractions, with molecular weights of 70.000, 80.000 and 90.000, with acetic anhydrides (AA) in the presence of a catalyst BF3.O(C2H5)2 were examined. Also, PS fractions, with high molecular weight (Mn * = 290.000 and 500.000), were modified under the optimum conditions to compare of functional groups to bound PS structure. The number of polyfunctional groups bound to the PS structure changed according to the molecular weight of the PS, and more functional groups were bound to lower molecular weight PSs. The bound functional groups and their amounts were determined with spectral and chemical analysis methods.

Keywords:

Polystyrene, acetic anhydride, chemical modification, FriedelCrafts acylation,

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