Understanding of the Plasticizing Effects of Glycerol and PEG 400 on Chitosan Films Using Solid-State NMR Spectroscopy

Domján, Attila; Bajdik, János; Pintye‐Hódi, Klára

doi:10.1021/ma8021234

Cited by 98 publications

(95 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that the two plasticizers were similar in mechanical tests, but different in the three-dimensional (3D) H-bonded structure, monitored by solid-state NMR spectroscopy. Their findings were supported by density functional theory calculations indicating formation of three H-bonds for glycerol with chitosan, and only one for PEG 400 [8]. In another study, it was found that hydrogen bonding played an important role in plasticizing starch films by monosaccharides and polyols, as indicated by FTIR spectra [9].…”

Section: Introductionmentioning

confidence: 70%

“…They confirmed the existence of hydrogen bonds between IBP and EC using Infrared spectroscopy [7]. Domjan et al [8] determined the plasticizing efficiencies for glycerol and PEG 400 as softening materials in amorphous chitosan films. They found that the two plasticizers were similar in mechanical tests, but different in the three-dimensional (3D) H-bonded structure, monitored by solid-state NMR spectroscopy.…”

Section: Introductionmentioning

confidence: 91%

See 1 more Smart Citation

Determination of plasticizers efficiency for nylon by molecular modeling

et al. 2012

View full text Add to dashboard Cite

Polyamides are semicrystalline polymers useful in a wide range of applications in the plastics industry. Some applications require higher flexibility and workability of the polyamides, therefore, plasticizers are added to ease compounding and processing procedures and produce the desired product properties. The goal of this study was to estimate plasticizers efficiency in plasticizing Nylon 66/6 copolymer (molar ratio 80/20, respectively) using computational tools and to compare the calculated estimations to experimental results. Four plasticizers were studied: glycerin mono stearate, benzene sulfonamide, methyl 4-hydroxybenzoate (M4HB), and diethylhexyl phthalate. Plasticizers efficiency was determined by calculating cohesive energy density, solubility parameters, free volume and interaction intensities of pristine nylon, and the nylon-plasticizer blends. It was found that the efficiency of the plasticizers increases with the degree of interaction intensity between the plasticizer and polymer chains and that M4HB molecules cause the largest changes in free volume. This finding correlates with the experimental results, based on reduction of polymer glass transition temperature (T g ). The highest calculated plasticization efficiency was obtained for M4HB, for which the decrease in T g was the most significant.

show abstract

Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 91%

Determination of plasticizers efficiency for nylon by molecular modeling

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The adhesive showed good bond strength that could be further improved with the addition of glycerol and trisodium citrate dehydrate [79]. It has been reported that citric acid reacts with chitosan amine groups to form amide bonds [80] and glycerol acts as a plasticizer which takes part in the curing process [81]. However, all formulations were found to have poor water resistance.…”

Section: Chitosanmentioning

confidence: 99%

Green Binders for Wood Adhesives

Norström¹,

Demircan²,

Fogelström³

et al. 2018

Applied Adhesive Bonding in Science and Technology

View full text Add to dashboard Cite

Today's society relies heavily on glued wood products for constructions, furniture, and floorings, for example. Essentially, all adhesives on the market are based on fossil-based resources, and many also contain formaldehyde to yield sufficient reactivity and adhesive performance. Formaldehyde is soon to be banned from consumer goods in Europe, due to its carcinogenic and allergenic features. With the rapidly growing societal environmental awareness, it becomes evident that it is crucial to seek greener, more sustainable alternatives. There is nothing new to this idea; on the contrary, prior to the advent of synthetic polymers, a range of biopolymers such as proteins and starch, were successfully used. However, since adhesives based on synthetic polymers were found to perform better, especially regarding the water resistance, the naturally sourced adhesives have had a subordinate role up until recently. The growing interest for using bio-polymers from renewable resources, such as wood/forest, corn, and cereals have spurred significant R&D developments toward the use of bio-polymers in green wood adhesives. The scope of the present chapter is to summarize, in short, some of the most recent scientific literature regarding the development of green adhesives.

show abstract

“…During external plasticization, only weak second-order bonds develop between the plasticizer and the polymer, while internal plasticizers are covalently bound to the plasticized material. External plasticizers can migrate in the polymer, which may lead to recrystallization of the material and loss of elasticity (37).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Design, Characterization, and In Vitro Evaluation of Antifungal Polymeric Films

et al. 2012

View full text Add to dashboard Cite

Abstract. The objective of the present paper was the development and the full characterization of antifungal films. Econazole nitrate (ECN) was loaded in a polymeric matrix formed by chitosan (CH) and carbopol 971NF (CB). Polyethylene glycol 400 and sorbitol were used as plasticizing agents. The mechanical properties of films were poorer when the drug was loaded, probably because crystals of ENC produces network outages and therefore reduces the polymeric interactions between the polymers. Polymers-ECN and CH-CB interactions were analyzed by Fourier-transform infrared spectroscopy (FTIR), thermal gravimetry analysis, and differential thermal analysis (DTA-TGA). ECN did not show structure alterations when loaded into the films. In scanning electron microphotographs and atomic force microscopy analysis, films prepared with CB showed an evident wrinkle pattern probably due to the strong interactions between the polymers, which were observed by FTIR and DTA-TGA. The in vitro activity of the formulations against Candida krusei and Candida parapsilosis was twice as greater as the commercial cream, probably as a result of the antifungal combination of the drug with the CH activity. All these results suggest that these polymeric films containing ECN are potential candidates in view of alternatives dosages forms for the treatment of the yeast assayed.

show abstract

Understanding of the Plasticizing Effects of Glycerol and PEG 400 on Chitosan Films Using Solid-State NMR Spectroscopy

Cited by 98 publications

References 42 publications

Determination of plasticizers efficiency for nylon by molecular modeling

Determination of plasticizers efficiency for nylon by molecular modeling

Green Binders for Wood Adhesives

Design, Characterization, and In Vitro Evaluation of Antifungal Polymeric Films

Contact Info

Product

Resources

About