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Progress in Organic Coatings 56 (2006) 135145 Incorporation of benzoic acid and sodium benzoate into
 

Summary: Progress in Organic Coatings 56 (2006) 135145
Incorporation of benzoic acid and sodium benzoate into
silicone coatings and subsequent leaching of the
compound from the incorporated coatings
Abdulhadi A. Al-Juhni, Bi-min Zhang Newby
Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325-3906, United States
Received 16 June 2005; received in revised form 20 January 2006; accepted 24 February 2006
Abstract
Benzoic acid and sodium benzoate, two less toxic antifoulants as compared to currently used biocides in marine biofouling protection, were
incorporated into silicone coatings to investigate their release behaviors and antifouling capabilities. It was found that benzoic acid, although
exhibiting excellent antifouling capability, formed large crystals inside the coating regardless of the solvent used to increase its miscibility with
silicone. The large crystals were found to be responsible for the fast leaching of the compound from the carrier coating, thus eliminating the
long-term usefulness of the coating. Sodium benzoate, which was highly immiscible with silicone, was able to be incorporated into silicone in the
form of small aggregates, and by tuning the preparation conditions, the aggregate size (hence the number of aggregates) could be varied. Leaching
of sodium benzoate from silicone was determined to be much slower than that of benzoic acid, and a direct relationship between the leaching rate
and the number of aggregates was observed. The sodium benzoate incorporated coating was found to exhibit enhanced antibacterial performance,
and, for coatings containing 1 wt.% of sodium benzoate, a 50% reduction in bacterial attachment was achieved.
2006 Elsevier B.V. All rights reserved.
Keywords: Antifoulant; Benzoic acid; Sodium benzoate; Silicone coatings; Antifoulant leaching; Bulk entrapment
1. Introduction

  

Source: Al-Juhani, Abdulhadi A. - Chemical Engineering Department, King Fahd University of Petroleum and Minerals
Newby, Bi-min Zhang - Department of Chemical and Biomolecular Engineering, University of Akron

 

Collections: Materials Science