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AuthorAmmar, Ali
AuthorElzatahry, Ahmed
AuthorAl-Maadeed, Mariam
AuthorAlenizi, Abdullah M.
AuthorHuq, Abul F.
AuthorKarim, Alamgir
Available date2021-02-08T09:14:52Z
Publication Date2017
Publication NameApplied Clay Science
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.clay.2016.12.012
URIhttp://hdl.handle.net/10576/17578
AbstractPolyimide (PI) and Polysulfone (PSF) films are used in many applications ranging from electronic film capacitors to membranes for gas separation and water purification, yet their phase separation issues limit many potential synergistic blend film applications. To this end, we examine the potential of nanoclays as non-traditional compatibilizers and re-enforcing agents in these technologically important polymer blend films. Herein, we quantify the effect of a nanoclay, Cloisite 30B on the phase separated blend film morphology compatibilization of PSF/PI and associated changes in its mechanical properties and film surface energy. Addition of as little as 1 mass% of organoclay strongly compatibilized the blend phases at all compositions, reducing the scale of blend phase separation by ~ 5 10 times, and interestingly, the net discreet surface phase separated domain area converged to that observed in 50% blend composition for other off-symmetric blend compositions. Clay compatibilization effects also induced a notable reduction of aspect ratio of surface phase separated domains in thin film blends, attributed to a high degree of exfoliation of the nanoclay by the PSF component so that the effective PSF domain interfacial tension with PI is reduced. Surface modification effects on topography leveling and surface energy changes are only qualitatively similar to our previous observations of block copolymer compatibilizer effect on polymer thin film blend phase separation. Thermal decomposition (TGA) measurements of PSF/PI films showed a decrease in thermal stability upon adding C30B due to its surfactant modification, while film mechanical tensile modulus properties improved slightly by adding low concentration of C30B (~ 1 mass%), but higher nanoclay loading decreased tensile strength and elongation at break. Finally we note that in terms of processing, the viscosities of the polymer solutions dramatically changed with addition 1 mass% and 3 mass% of C30B. We anticipate that more generally, nanoclays can act similarly to traditional polymeric compatibilizers in many aspects in suppressing polymer thin film blend phase separation that can have ramifications for many advanced technological applications such as sensors and membranes. To this end, we present preliminary oxygen barrier properties of adding Cloisite 30B on PSF/PI blend films.
SponsorWe would like to acknowledge the American Chemical Society, Petroleum Research Foundation's New Direction (ACS-PRF-ND) program and the W.M. Keck Foundation for support of the research work. The authors also extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for their funding of the Prolific Research Group (PRG-1436-14). We would like to thank Dr. Sergei Nazarenko at the University of Southern Mississippi for the oxygen permeability test. Further acknowledge to Dr. Miko Cakmak at Purdue University for using his real-time tracking-drying instrument of cast polymer films.
Languageen
PublisherElsevier Ltd
SubjectCloisite 30B
Nanocomposite films
Polyimide
Polysulfone
Properties
TitleNanoclay compatibilization of phase separated polysulfone/polyimide films for oxygen barrier
TypeArticle
Pagination123-134
Volume Number137
dc.accessType Abstract Only


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