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Title: Film formation process of natural rubber latex particles: roles of the particle size and distribution of non-rubber species on film microstructure
Authors: Manus Sriring
Adun Nimpaiboon
Sirirat Kumarn
Keiko Higaki
Yuji Higaki
Ken Kojio
Atsushi Takahara
Chee Cheong Ho
Jitladda Sakdapipanich
Universiti Tunku Abdul Rahman
Oita University
Mahidol University
Kyushu University
Keywords: Chemical Engineering;Chemistry;Physics and Astronomy
Issue Date: 5-May-2020
Citation: Colloids and Surfaces A: Physicochemical and Engineering Aspects. Vol.592, (2020)
Abstract: © 2020 Elsevier B.V. Natural rubber (NR) films from various mixing ratios of large- (LRP) and small rubber particles (SRP) were prepared through latex and solution casting methods. Film-forming behaviours of the resulting films were investigated by monitoring their surface characteristics using atomic force microscopy (AFM). When the SRP portion was higher, the surface of the latex-cast films was found to be smoother as smaller particles protruded out of the surface less than larger ones did. AFM phase micrographs revealed a hexagonal shape of packed rubber particles (RPs) of the LRP film, while the RPs in the other samples were sphere-like. After aging under ambient conditions, the packed RPs were flattened while retaining their RP boundaries, creating a supporting framework within the rubber matrix. On the contrary, when the rubber film was cast from a toluene solution, the characteristic of RP boundaries disappeared and became aggregates of the membrane components on the film surface. The latex-cast films performed much better in mechanical strength than the solution-cast films did due to the destruction of the supporting framework arisen from the non-rubber components at the RP boundaries of the solution-cast film. An inhomogeneous density distribution produced by the non-rubber aggregates in the latex-cast films was observed in small angle X-ray scattering measurements.
ISSN: 18734359
Appears in Collections:Scopus 2020

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