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Effects of mixing protocol and mixing time on viscoelasticity of compatibilized PP/PS blends

Salehiyan, Reza; Choi, Woo Jin; Lee, Jun Hyup; Hyun, Kyu


Reza Salehiyan

Woo Jin Choi

Jun Hyup Lee

Kyu Hyun


Linear and non-linear viscoelastic properties of Polypropylene (PP)/Polystyrene (PS) blends with organoclay (C20A) as a compatibilizer were investigated using dynamic oscillatory measurement, i.e., small amplitude oscillatory shear (SAOS) and large amplitude oscillatory shear (LAOS) tests. Four different mixing protocols were applied to probe the effect of mixing sequence on rheological properties. Moreover, each protocol was conducted at three mixing times, i.e., 1, 3, and 8 min, to investigate the effect of mixing time on final rheological properties. Final results revealed that mixing time had no significant effect on either the viscoelastic response of the simultaneously mixed blends or the PP+C20A/PS (PP and C20A mixed for 30 seconds and then PS added) blend. On the other hand, rheological properties of the PS+C20A/PP (PS and C20A mixed for 30 seconds and then PP added) blend significantly increased upon 1 min of total mixing time, whereas 3 and 8 min of mixing demonstrated almost the same results as their other blended counterparts. TEM pictures revealed migration of C20A particles from PS phase towards the interface with increasing mixing time.

Journal Article Type Article
Acceptance Date Jun 4, 2014
Online Publication Date Aug 29, 2014
Publication Date 2014-08
Deposit Date Jan 30, 2023
Journal Korea-Australia Rheology Journal
Print ISSN 2093-7660
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 26
Issue 3
Pages 311-318
Keywords linear and non-linear viscoelastic properties, PP/PS/C20A blends, mixing protocol, mixing time