Modified cassava starch/poly(vinyl alcohol) blend films plasticized by glycerol: Structure and properties

Abstract

We report a systematic investigation on the structure–property relationships in glycerol‐plasticized poly(vinyl alcohol) (PVA)/cassava starch blends prepared via solution casting. In particular, PVA mixed with native, low‐oxidized, high‐oxidized, and pregelatinized cassava starches were characterized by means of SEM, XRD, FTIR, thermal analysis and mechanical testing and the immiscible systems were received. Burial tests over a period of several days suggested the preferential degradation of the starch and glycerol component (as indicated by the absence of FTIR signatures of those components) and the amorphous phase of PVA (as indicated by the enhanced crystallinity index of the degraded samples). The rheological properties of the blends seem to dictate their morphological characteristics that, in turn, have a profound impact on their mechanical properties. In that sense, the study highlights promising strategies for the development of a new family of polymeric materials that combine their biodegradable nature within superior mechanical properties. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48848.

Poly(vinyl alcohol)-Based Biofilms Plasticized with Polyols and Colored with Pigments Extracted from Tomato By-Products

“…Moisture PVOH is an eco-friendly compound with ideal film-forming properties [66,67], which in mixture with diols like PDO and BDO, or triols like glycerol achieves good behavioral properties in terms of flexibility and elasticity, and maintains favorable external features like transparency and soft texture. Remarkable results were reported in the literature in the case of polyols used as plasticizers [57]. For example, Boonsuk et al (2020) obtained biodegradable PVOH/chitosan-based films with superior mechanical properties when they added glycerol as a plasticizer [57].…”

“…Remarkable results were reported in the literature in the case of polyols used as plasticizers [57]. For example, Boonsuk et al (2020) obtained biodegradable PVOH/chitosan-based films with superior mechanical properties when they added glycerol as a plasticizer [57]. PDO was intensively used as a plasticizer material in the composition of biodegradable films, fibers, and plastics of Sorona family (PTT-based plastic materials) [68].…”

“…The incorporation of Gly, PDO, and BDO in the biofilms had better thermoplastic processability than the simple biofilms, which had only PVOH or PVOH+TP. Workability and rigidity issues can be solved with the addition of plasticizers like glycerol which enhances the ductility and flexibility of biofilms [56,57], while PDO and BDO are able to improve the crystallinity and the thermal characteristics of biofilms [58].…”

“…Compared with the results that we obtained previously [35] for the PVOH-based biofilms improved with chitosan or itaconic acid, the biofilms from the present study were smoother and much more flexible. of plasticizers like glycerol which enhances the ductility and flexibility of biofilms [56,57], while PDO and BDO are able to improve the crystallinity and the thermal characteristics of biofilms [58].…”

Citrus Limon L. Peel Powder Incorporated Polyvinyl Alcohol/Corn Starch Antioxidant Active Films

“…Similar morphology was reported by Das et al (2010) for glycerol and epichlorohydrin cross-linked starch-PVA films. The incorporation of lemon peel increased the homogeneity of the film surface which could be related to hydrogen bonding between the -OH groups of lemon peel, PVA and starch (Boonsuk et al, 2020). Additionally, this showed the better adhesion and compatibility between peel and matrix (Singha et al, 2015).…”