Synthesis and thermo-XRD-analysis of the organo-clay color pigment

Yermiyahu, Z.; Lapides, I.; Yariv, S.

doi:10.1007/s10973-006-8121-1

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…41,45 Based on the difference of their intensity and according to the Buschle-Diller and Zeronian equation, the crystallinity index of CNF was obtained as 58%. In the MMT pattern, reflections of 7.7°(characteristic of the tactoids planar monolayer) and 19.6°corresponding to silicates were observed 46,47 which used to trace the presence of MMT in the CNF film (Figure 1c). The shift of silicate (2θ = 7.7°) to a lower angle (2θ = 6.9°) is an indication of an increased interlayer distance due to the intercalation as in CNF−MMT nanocomposites.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Sustainable Barrier System via Self-Assembly of Colloidal Montmorillonite and Cross-linking Resins on Nanocellulose Interfaces

Tayeb

Tajvidi

2018

ACS Appl. Mater. Interfaces

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Cellulose nanofibrils (CNFs) are able to form strong oxygen-barrier films suitable for food packaging but lack the needed water resistance in comparison to plastics. Desired water barrier quality can be achieved by applying mineral additives within the nanofibrils network. In current contribution, a sustainable hybrid system with an improved water barrier function is proposed by incorporating colloidal montmorillonite nanoclay (MMT) and two cross-linking agents, namely, polyamidoamine epichlorohydrin (PAE) and Acrodur thermoset acrylic resin (ACR) into CNF interfaces. Continuous matrices were produced via evaporation-induced self-assembly of colloidal building blocks followed by appropriate heat-curing regime to impart internal cross-linking. The development of chromophore functionalities and formation of ester motifs on the hybrid matrix (with no evidence of degradation) were detected by Fourier-transform infrared (FT-IR) spectroscopy. Intercalation of clay, solely, reduced the water vapor transmission rate (WVTR) to some extent; however, a more remarkable decline (by 60%) was observed upon the curing and cross-linking process. In fact, combination of clay platelets and cross-linkers contributed to a denser film structure and restricted water passage. Also, an excellent resistance to oil and grease was observed in all the studied films (Kit number of 11). A reduction in tensile strengths and resistance to cracking at fold was noted and ascribed to MMT interference in cellulose interchain hydrogen bonds. This however was counteracted by the introduction of cross-linkers, apparently by aiding stress transfer within the matrix. MMT imparted a limited elevation in the surface free energy, pointing out to an induced hydrophilicity; however, surface energy values declined markedly upon using cross-linkers. Finally, thermal stability of hybrids was adversely affected, compared to neat CNFs. Our study suggests the potential utilization of low-cost, sustainable biobarrier films for application in food/drug packaging, where low permeation of moisture is highly desirable.

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Section: ■ Experimental Sectionmentioning

confidence: 99%