Altered Thermal and Mechanical Properties of Spruce Galactoglucomannan Films Modified with an Etherification Reaction

Härdelin, Linda; Bernin, Diana; Börjesson, Mikaela; Ström, Anna; Larsson, Anette

doi:10.1021/acs.biomac.9b01730

Cited by 18 publications

(18 citation statements)

References 21 publications

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“…The FT-IR spectra of the etherified hemicellulose films are shown as Figure 7 . The observed characteristics peaks of hemicellulose agree with those reported in literature, indicating successful extraction and modification [ 1 , 29 , 36 ]. More specifically, in the unetherified poplar hemicellulose, the C–O stretching vibration peak intensity at 1044 cm −1 was significantly weaker than that of the uronic acid –COO − stretching vibration peak intensity at 1415 cm −1 .…”

Section: Resultssupporting

confidence: 88%

“…Epoxides possess an unstable ternary ring containing oxygen, which causes electrons to fall off neighboring carbon atoms; thus, epoxides are reactive to the hydroxyl compound, hemicellulose. The etherification can reduce the solubility of the hemicellulose film, enhance its biodegradability, and improve its film-forming performance [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Barrier Film of Etherified Hemicellulose from Single-Step Synthesis

et al. 2020

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Hemicellulose with good biodegradability and low oxygen permeability shows great potential in food packaging. However, its strong hydrophilicity leads to its poor moisture resistance, which hinders its wider application. In this paper, a near-hydrophobic hemicellulose was obtained by using single-step synthesis from poplar powder via etherification modification with epoxy chloropropane. This proposed approach has the advantage of avoiding the destruction of hemicellulose structure by secondary alkali-hydrolysis, which was what usually occurred in traditional etherification procedures. The feasibility of using epoxy chloropropane as an alkylation reagent to etherify hemicellulose was confirmed, and the reaction mechanism was elucidated. Contact angle test, thermogravimetric analysis, oxygen transmittance test, and infrared spectrum analysis showed that the barrier property and thermal stability of etherified hemicellulose films have been significantly improved. At an epoxy chloropropane/wood powder ratio (volume/weight) of 2/3 (mL/g), the epoxy hemicellulose films contained the most epoxy groups and displayed the best performance, i.e., tensile strength of 14.6 MPa, surface contact angle of 71.7° and oxygen transmission coefficient of 1.9 (cm3·µm)/(m2·d·kPa), showing great promise as barrier film in food-packaging.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Barrier Film of Etherified Hemicellulose from Single-Step Synthesis

et al. 2020

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“…As shown in the figure, each film with varying STMP addition has obvious stretching vibration peak of fatty alcohol (-OH) at about 3300 cm −1 , and the stretching vibration peak of alkane C-H at about 2900 cm −1 . At 1050 cm −1 , the stretching vibration peaks of C-O bond and C-C bond in hemicellulose or the bending vibration peaks of C-O (H) on sugar ring were observed, which was consistent with the structural characteristics of hemicellulose film reported in literature [15,20,32]. After the addition of STMP, three characteristic peaks of P/O bond appeared at 1260 cm −1 , 991 cm −1 and 759 cm −1 , and became more obvious with the increase of STMP addition, indicating the successful crosslinking of hemicellulose by STMP.…”

Section: Structure Analysis Of Stmp Crosslinked Hemicellulose Filmssupporting

confidence: 91%

“…However, due to the complexity and diversity of hemicellulose structure, the research on hemicellulose is still in its infancy [9][10][11]. The chemical modification methods of hemicellulose mainly include esterification [12][13][14], etherification [15][16][17], grafting [18,19] and crosslinking [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical and Barrier Property of Hemicellulose Film via Crosslinking with Sodium Trimetaphosphate

et al. 2021

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Hemicellulose is a kind of biopolymer with abundant resources and excellent biodegradability. Owing to its large number of polar hydroxyls, hemicellulose has a good barrier performance to nonpolar oxygen, making this biopolymer promising as food packaging material. Hydrophilic hydroxyls also make the polymer prone to water absorption, resulting in less satisfied strength especially under humid conditions. Thus, preparation of hemicellulose film with enhanced oxygen and water vapor barrier ability, as well as mechanical strength is still sought after. Herein, sodium trimetaphosphate (STMP) was used as esterification agent to form a crosslinked structure with hemicellulose through esterification reaction to render improved barrier performance by reducing the distance between molecular chains. The thus modified hemicellulose film achieved an oxygen permeability and water vapor permeability of 3.72 cm3 × μm × m−2 × d-1 × kPa−1 and 2.85 × 10−10 × g × m−1 × s−1 × Pa−1, respectively, at the lowest esterification agent addition of 10%. The crosslinked structure also brought good mechanical and thermal properties, with the tensile strength reaching 30 MPa, which is 118% higher than that of the hemicellulose film. Preliminary test of its application in apple preservation showed that the barrier film obtained can effectively slow down the oxidation and dehydration of apples, showing the prospect of application in the field of food packaging.

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“…The thus-functionalized GGM showed significantly decreased water absorption, indicating an increased hydrophobicity. Meanwhile, through dynamic mechanical analysis, Härdelin and co-workers [ 53 ] found that the functionalization of GGM improved both thermal performance and mechanical properties of the modified film. The modified film showed a reduced glass transition temperature ( T g), which makes the film easier to process.…”

Section: Modification Of Hemicellulosementioning

confidence: 99%

Hemicellulose-Based Film: Potential Green Films for Food Packaging

et al. 2020

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Globally increasing environmental awareness and the possibility of increasing price and dwindling supply of traditional petroleum-based plastics have led to a breadth of research currently addressing environmentally friendly bioplastics as an alternative solution. In this context, hemicellulose, as the second richest polysaccharide, has attracted extensive attention due to its combination of such advantages as abundance, biodegradability, and renewability. Herein, in this review, the latest research progress in development of hemicellulose film with regard to application in the field of food packaging is presented with particular emphasis on various physical and chemical modification approaches aimed at performance improvement, primarily for enhancement of mechanical, barrier properties, and hydrophobicity that are essential to food packing materials. The development highlights of hemicellulose film substrate are outlined and research prospects in the field are described.

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Altered Thermal and Mechanical Properties of Spruce Galactoglucomannan Films Modified with an Etherification Reaction

Cited by 18 publications

References 21 publications

Barrier Film of Etherified Hemicellulose from Single-Step Synthesis

Barrier Film of Etherified Hemicellulose from Single-Step Synthesis

Enhancement of Mechanical and Barrier Property of Hemicellulose Film via Crosslinking with Sodium Trimetaphosphate

Hemicellulose-Based Film: Potential Green Films for Food Packaging

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