Influence of temperature, molecular weight, and polydispersity of polystyrene on interfacial tension between low‐density polyethylene and polystyrene

Abstract

ABSTRACT:In this work, the influence of temperature, molecular weight, and polydispersity of polystyrene on interfacial tension between low-density polyethylene (LDPE) and polystyrene (PS) was evaluated using the pendant drop method. It was shown that interfacial tension between LDPE and PS decreases with increasing temperature for all LDPE-PS pairs studied. The temperature coefficient (Ѩ␥/Ѩ⌻) (where is interfacial tension and ⌻ is temperature) was higher for lower molecular weight and larger polydispersity of PS. The interfacial tension between LDPE and PS at a temperature of 202°C increased when the molecular weight of polystyrene was varied from 13,000 to 30,000. When the molecular weight of PS was further increased, the interfacial tension was shown to level off. The effect of polydispersity on interfacial tension between PS and LDPE, at a temperature of 202°C, was studied using PS with a constant-number average molecular weight and varying polydispersity. The interfacial tension was shown to decrease with increasing polydispersity. However, the influence of polydispersity was lower for PS of higher molecular weight.

Comportamento Viscoelástico Linear e Morfologia de Blendas PP/HDPE

“…O decréscimo linear da tensão interfacial com a temperatura é esperado termodinamicamente e tem sido reportado por muitos pesquisadores para diferentes pares de polímeros [25,26] . O coeficiente de temperatura (∂γ/∂T) obtido foi de (-0,025x10 -3 N/mK) e corroborou com valores obtidos para outros pares de polímeros [27] .…”