Effect of Star Structure Versus Linear Polymers on Structure and Shear Rheology

Öz

The research focuses on developing a star-shaped polymer with a poly(divinylbenzene) nucleus and poly(styrene) arms through ATRP polymerization. The rheology of linear and star polymers with narrow molecular weight distributions was compared with commercially available high molecular weight PS. The polymers containing DOA plasticizer were subjected to rheology experiments at 25°C at varying shear rates. The entangled and randomly oriented polymer chains dispersed during flow, increasing free space and reducing molecular interactions. At elevated shear rates, the polymers achieved the infinite shear viscosity plateau (η∞). The shear rate-independent behavior of the commercially used linear PS mixture containing DOA was observed. In contrast, star polymers exhibited a smaller hydrodynamic volume and gyration radius, leading to a lower viscosity.

Anahtar Kelimeler

• Rheology
• Multiarm star polymer
• Polymer characterization

Yıldız Yapısının Doğrusal Polimerlere Karşı Yapı ve Kesme Reolojisi Üzerindeki Etkisi

Öz

Araştırma, ATRP polimerizasyonu yoluyla poli(divinilbenzen) çekirdeği ve poli(stiren) kolları olan yıldız şekilli bir polimer geliştirmeye odaklanmıştır. Dar moleküler ağırlık dağılımlarına sahip doğrusal ve yıldız polimerlerin reolojisi, ticari olarak temin edilebilen yüksek moleküler ağırlıklı PS ile karşılaştırılmıştır. DOA plastikleştirici içeren polimerler, değişen kayma hızlarında 25°C'de reoloji deneylerine tabi tutulmuştur. Dolaşık ve rastgele yönlendirilmiş polimer zincirleri akış sırasında dağılmış, serbest alanı artırmış ve moleküler etkileşimleri azaltmıştır. Yüksek kayma hızlarında, polimerler sonsuz kayma viskozite platosuna (η∞) ulaşmıştır. DOA içeren ticari olarak kullanılan doğrusal PS karışımının kayma hızından bağımsız davranışı gözlemlenmiştir. Bunun aksine, yıldız polimerler daha küçük bir hidrodinamik hacim ve dönme yarıçapı sergilemiş ve bu da daha düşük bir viskoziteye yol açmıştır.

Anahtar Kelimeler

• Reoloji
• çok kollu yıldız polimerler
• Polimerlerin karakterizasyonu

Kaynakça

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