10.1016/j.polymer.2008.11.027

Effect of compatibilization on the deformation and breakup of drops in step-wise increasing shear flow

Abstract

Drop deformation and breakup were investigated in the presence of a block copolymer in step-wise simple shear flow using a home-made Couette cell connected to an Anton Paar MCR500 rheometer. Polyisobutylene (PIB) was used as the matrix, while five different molecular weights of polydimethylsiloxane (PDMS) were selected to provide drops with a relatively wide range of viscosity ratio. A block copolymer made of PDMS-PIB was used for interfacial modification of the drop-matrix system. The copolymer concentration was 2 wt% based on the drop phase. The experiments consisted in analyzing the drop shape and measuring the variation of the length to diameter ratio, L/D, both in steady state and in transient regimes till breakup. This allowed revising of the classical Grace curve that reports the variation of the critical capillary number for breakup as a function of viscosity ratio and providing also a new one for blends compatibilized with an interfacial active agent with a given molecular weight.Peer reviewed: YesNRC publication: Ye

Similar works

Full text

thumbnail-image

NRC Publications Archive

Full text is not available
oai:cisti-icist.nrc-cnrc.ca:cistinparc:23004755Last time updated on 1/16/2019

This paper was published in NRC Publications Archive.

Having an issue?

Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.