Studies on porosity in polymer latex films and particles

Hodges, IC, 2003. Studies on porosity in polymer latex films and particles. PhD, Nottingham Trent University.

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Abstract

The creation of porous latex films and particles has been studied. The methods evaluated for the creation of pores in polymer latex films were; leachable additives, exceeding the critical pigment volume fraction (CPVF) of the latex and flocculation of the latex prior to film formation. Pore formation in the latex films was evaluated by specific surface area (SSA) (nitrogen adsorption) and porosimetry (mercury intrusion) determination. Successful pore formation processes were applied to a functionalised latex and its catalytic activity evaluated. It was found that up to 90% of the catalytic activity of the original latex spheres could be retained by the film. A porous latex film was coated with chitosan and it's metal chelation properties were evaluated against flakes of chitosan. The chitosan on the film adsorbed more metal ions from solution and at a faster rate than the chitosan flakes. Initial studies on the transport properties of non-functionalised porous latex films were evaluated via dynamic adsorption and advantages shown. Samples of a well characterised carbon adsorbent coated by nonporous and porous latex films were compared to determine hindrance to vapour sorption.

The method evaluated for creation of pores in latex particles was based on normal macroreticular resin synthesis, but using emulsion polymerisation rather than suspension polymerisation to achieve particles in the nanometre size range. Pore formation in latex particles was evaluated by SSA (nitrogen adsorption) determination and electron microscopy studies. The theoretical SSA of the particles calculated from the particle diameters was compared with the SSA obtained from the nitrogen adsorption determination. Latex samples were made with total SSAs of 554 m2 g-1 which were 373 m2 g-1 higher than predicted by electron microscopy for non porous particles of the same diameter. Clear trends were seen with the ratio of styrene to divinyl benzene having the most effect on the creation of pores. Evaluation, by t-plots, of particles with more SSA than theoretically predicted showed that the pores were all in the microporous range.

Item Type:	Thesis
Creators:	Hodges, I.C.
Date:	2003
ISBN:	9781369314274
Identifiers:	Number Type PQ10183151 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	18 Sep 2020 09:32
Last Modified:	26 Jul 2023 11:06
URI:	https://irep.ntu.ac.uk/id/eprint/40797

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