ADHESIVE PROPERTIES OF CARBOXYMETHYLATED CASSAVA STARCH

Louis Mahakwe Nwokocha

Abstract


C

assava starch was carboxymethylated to different degrees of substitution by treating the alkalized starch with different amounts of sodium monochloroacetate. From the carboxymethylated cassava starch materials, adhesives were produced, which were used to bond wood substrates. The adhesive strength of bonded wood substrates was determined using a tensometer. The effects of degree of substitution, solids content, pH and relative humility (RH) on adhesive strength were investigated. The variation of adhesive strength with degree of substitution (r2= 0.999) and solids content (r2= 0.98) obeyed a third and fourth order polynomial, respectively, while it was second order with pH (r2= 1). The result showed that the adhesive property decreased with increasing relative humidity. The high water dispersibility of carboxymethylated cassava starch would permit its use at high solids content for enhanced adhesive properties.

Key words: Cassava starch; carboxymethylation, degree of substitution, adhesive properties


Full Text:

PDF

Refbacks

  • There are currently no refbacks.


Copyright (c) 2017 Journal of Raw Materials Research

©2017 Raw Materials Research and Development Council