Polietilen Oksitin Ultrasonik Zincir Kırılması: Konsantrasyon ve Sıcaklık Etkisi

Polietilen oksitin sulu çözeltilerde ultrasonik zincir kırılması çalışılmıştır. Çözelti konsantrasyonu ve sıcaklığın polietilen oksit zincir kırılmasına etkileri incelenmiştir. Sonikasyon 20 kHz ultrases frekansında sabit güç ile 1x10-3, 2x10-3, 3x10-3, 4x10-3 g/mL polietilen oksit konsantrasyonlarında ve 10, 20, 30, 40 0C sıcaklıklarda gerçekleştirilmiştir. Polimer zincir kırılması çözeltinin spesifik viskozitesinin sonikasyon zamanına göre değişimi cinsinden karakterize edilmiştir. Teorik Madras ve Giz zincir kırılması modelleri viskozite ortalama molekül ağırlığı değişimini analiz etmek ve limit molekül ağırlığı - kırılma sabiti belirlemek için kullanılmıştır. Sonuçlar viskozite-molekül ağırlığının azaldığını ve zincir kırılmasının daha düşük sıcaklıklar ve çözelti konsantrasyonlarında daha hızlı ilerlediğini göstermektedir

Ultrasonic Chain Scission of Polyethylene Oxide: Effect of Concentration and Temperature

The ultrasonic chain scission of polyethylene oxide was studied in aqueous solutions. The effects of solution concentration and temperature on polyethylene oxide chains scission were investigated. Sonication is performed at 20 kHz ultrasound frequency with fixed power at 1x10-3 , 2x10-3 , 3x10-3 , 4x10- 3 g/mL polyethylene oxide concentration and temperatures of 10, 20, 30, 40 0 C. Poymer chain scission was charactrized in terms of the change in the specific viscosity of the solution as a function of sonication time. Theoretical Madras and Giz chain scission models were used to analyse the viscosity average molecular weight evaluation and determine the limit molecular weight – scission constant. Results show that viscosity - molecular weight decreased and the chain scission proceeded faster for lower temperatures and solution concentrations.

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