Sodium alginate/Na⁺‐rectorite composite films: Preparation, characterization, and properties

Abstract

Rectorite (REC), one kind of layered silicates, has been applied to polymers to improve their properties. The sodium alginate (SA) layered silicate is a new option to modify the properties of polysaccharides. In this article, SA was modified by Na þ -rectorite (Na þ REC). The chemical structures and microstructures of Na þ REC and Na þ REC modified SA (SA/Na þ REC) were analyzed by using Fourier transform infrared spectrometer and X-ray diffraction. The morphologies of SA/Na þ REC composites were observed by using scanning electron microscopy and transmission electron microscopy. The mechanical and anti-ultraviolet properties as well as thermal properties of SA/Na þ REC composites were investigated. The results show that the properties of pure SA film can be improved by the addition of Na þ REC, and SA/Na þ REC composite containing 2 wt % Na þ REC has the best intercalation effect and optimum comprehensive properties among the prepared composites in this article.

RETRACTED: Influence of alkali metal cations on the thermal, mechanical and morphological properties of rectorite/chitosan bio-nanocomposite films

“…The peaks at 3443 and 3641 cm −1 are attributed to the bending vibration of the hydrogen band of interlaminar water and the hydroxyl stretching of SiOH (Yang, Liang, Zhang, He, & Wang, 2009), while the hydroxyl bending of water appeared at 1641 cm −1 . The peaks at 1047 cm −1 are associated with the Si O stretching vibration, while the peaks in the region 500-580 cm −1 are assigned to the Si O bending vibration.…”

Seaweed biopolymers as additives for unfired clay bricks

“…Composite materials which combine sodium alginate and clays are currently being investigated in applications as diverse as drug delivery (Pongjanyakul and Puttipipatkhachorn, 2007;Wang et al, 2013;Iliescu et al, 2011), heavy metal adsorption (Li et al, 2011) and nano-composite films (Yang et al, 2009). Several studies have also discussed the use of alginate in agricultural applications where the alginate-clay interactions are used to increase the stability of soil aggregates or to aid plant growth (Quastel and Webley, 1947;Emerson, 1956;Schneider, 1977;Orts et al, 2007;Bernu et al, 2010).…”

Synthesis and properties of sodium alginate/Na+rectorite grafted acrylic acid composite superabsorbent via 60Coγ irradiation

“…The SA solution was slowly mixed into the Na + REC suspending liquid using homogenizer for 5 min, then glycerine (10%, w/w based on SA) as the plasticizer was dropped into the mixture. The mixture was stirred with a high speed shear mixer for 3 h and salivated on a dust-free glass plate with a uniform thickness for curing by a procedure of 50 • C for 5 h. After dryness, the resultant material is milled to get SA/Na + REC composite with a particle size in the range of 160-200 mesh (Yang et al, 2009). …”

“…As an extension of our previous work on SA/Na + REC composite (Yang, Liang, Zhang, He, & Wang, 2009), SA/Na + REC-g-PAA composite superabsorbent was obtained by 60 Co␥-irradiation. The mechanism of graft copolymerization via 60 Co␥ irradiation was preliminary studied.…”