The moisture
diffusion coefficient was greatest for the neat TPS, and it
was decreasing with the increasing amount of cellulose
nanofibers. Therefore, we can say that the addition of
cellulose nanofibers restricts the moisture diffusion in
thermoplastic starch. The reduction of moisture absorption
of two hydrophilic materials, starch and cellulose, can be
explained by several factors: (1) moisture penetration is
reduced by the good interfacial adhesion between cellulose
and starch [26,36]; (2) cellulose is less hygroscopic than
starch due to higher degree of crystallinity, which is why
the moisture absorption reduces with addition of CNF
[11,26], and (3) formation of fibrous network of cellulose
prevents the swelling of the starch matrix and thus reduces
the moisture penetration
The moisturediffusion coefficient was greatest for the neat TPS, and itwas decreasing with the increasing amount of cellulosenanofibers. Therefore, we can say that the addition ofcellulose nanofibers restricts the moisture diffusion inthermoplastic starch. The reduction of moisture absorptionof two hydrophilic materials, starch and cellulose, can beexplained by several factors: (1) moisture penetration isreduced by the good interfacial adhesion between celluloseand starch [26,36]; (2) cellulose is less hygroscopic thanstarch due to higher degree of crystallinity, which is whythe moisture absorption reduces with addition of CNF[11,26], and (3) formation of fibrous network of celluloseprevents the swelling of the starch matrix and thus reducesthe moisture penetration
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