STARCH-STARKE
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2021
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IF 2.741
Lei Chen,Jing Li,Zia-ud Din,Chun Hu,Hanguo Xiong
Nanoparticle incorporation is a common strategy for promoting the performance of starch-based wood adhesive as low storage stability limits the application of conventional nanocomposite adhesives. This work focuses on the performance comparison of adhesives containing different nanoparticles (nano-TiO 2 , TK (TiO 2 -KH570), TKB (TiO 2 -KH570-Butyl acrylate)) to improve both the bonding strength and storage stability. The structure and morphology of these nanoparticles are characterized by Fourier transform infrared spectroscopy and transmission electron microscopy. The results indicate that the surface modification improves the dispersion of nano-TiO 2 . After adding in adhesive, the results of shear strength, viscosity, and rheological properties signify that the structural strength within adhesive is related to the surface hydrophobicity and the thickness of the surface hydrophobic layer of functionalized nanoparticles. TKB exhibits excellent improvement on the storage stability of adhesive due to its wide surface hydrophobic layer weakening the intermolecular interaction. TK shows limited improvement on both bonding strength and storage stability as the hanging hydrogen groups from KH570 form cross-linking structure with other components in adhesive. Therefore, selecting the appropriate functional nanoparticles is an important parameter for designing high-performance wood adhesive for the veneer industry.
研究领域:
材料科学
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林产品工程
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DOI
高影响因子
STARCH-STARKE
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2019
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IF 1.795
Wei Meng,Fangping Chen,Chenhao Zhang,Ruihua Cui,Peilei Wang,Changsheng Liu
In this study, a high-efficiency polyurethane prepolymer (PUP) compatibilizer is developed to improve the compatibility between cassava starch and poly(butylene adipate-co-terephthalate) with higher molecular weight (MPBAT). Preferentially, modified starch (MS) is prepared by reacting isocyanate groups of PUP with hydroxyl groups of starch in a high-speed mixer, and then starch-based MPBAT composites (MSPT) with PUP as a compatibilizer are continuously extruded using twin-screw extruder. The mechanical properties, water absorption, and thermodynamic properties as well as morphology of MSPT are investigated with different PUP contents and at the same mass ratio of MPBAT to starch (1:1). Samples of MSPT-2 provide satisfactory mechanical properties comparable to control samples. Addition of 13 wt.% PUP to MSPT, improves tensile strength from 3.8 to 11.9 MPa and increases elongation at break from 93.3 to 580.4% at room temperature compared with control without the PUP. The hydrophobicity and thermostability properties of MSPT-2 composites are also enhanced. The results further prove that MSPT-2 composites possess excellent compatibility, not only because of the urethane bonds of the PUP and starch, but also stemming from the physical crosslinking between soft segment of PUP and aliphatic segment of MPBAT. Starch-based MPBAT composites with excellent compatibility and high toughness will help broaden the application field of biodegradable plastics.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
STARCH-STARKE
·
2021
·
IF 2.741
Hui Yang,Rihui Lin,Yanye Fan,Sai Jiang,Yujiao Lin
The rosin acid starch (RAS) is prepared under the catalysis of lipase, by esterification on the starch particles' surface in a two-phase reaction system, using rosin acid and native cassava starch as starting materials. The effects of reaction time, solvent types, substrate ratio, reaction temperature, and lipase dosage on the degree of substitution (DS) of RAS are investigated. Based on the single factor experiments, the reaction conditions are optimized according to the principle of the combination Box-behnken centered design and response surface methodology analysis. The mathematical model of the influence of reaction temperature, material ratio, and enzyme addition amount on DS is established. The optimum synthesis conditions are determined as follows: solvent, trichloromethane; reaction time, 10 h; reaction temperature, 59 °C; substrate ratio (m Rosin acid :m starch) , 4.1; and lipase dosage, 264 µL. Under these conditions, it is found that the DS is 0.0608. The analysis of variance and verification experiments show that the mathematical model has good fit degree and high credibility. Compared with the native cassava starch, RAS has improved contact angle, emulsion capacity, and emulsion stability.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2021
·
IF 2.741
Dan Qin,Jun Wu,Yuxiang Zhang,Mian Bao,Xiaoyue Du,Hongqing Sang,Zhengyou Wei
This study experimentally investigates the effect of changes in amylose-to-amylopectin ratio on the multi-scale structures, hydrophilicity, and thermal properties of starch–chitosan essential oil (EO) films incorporated with vanillin. The results indicate that aggregates and uneven structures tend to form in the EO films with a higher proportion of amylose. In Fourier transform infrared spectroscopy, as the chitosan content increases, the wavenumber of stretching vibration of hydroxyl and the bending vibration of amino groups decrease, while the wavenumber of stretching vibration of C-O increases. Furthermore, with an increase in the chitosan content, the changes in the starch–chitosan EO film structure impacts the hydrophilic trend, and the hydrophilic changes in the EO films with common starch and G80 starch are significant changes with the proportions of starch to chitosan from 7:3 to 5:5. When their mass ratio is 3:7, the starch–chitosan EO films investigated exhibit the lowest decomposition peak temperature.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
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2020
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IF 2.226
Junhui Li,Lei Tian,Yizhou Fang,Wenwei Chen,Guangrong Hunag
As an energy-saving and effective physical method, ultrasound technologies are gaining research attention for the production of modified starches. Corn starch–caffeic acid complexes are prepared via ultrasound process, and the effect of ultrasound power on the physicochemical properties and in vitro digestion of the complexes is investigated. The results of Fourier-transform infrared spectroscopy and the amount of complexes analysis indicate that ultrasound can help with the formation of starch–caffeic acid complexes, and the amount of caffeic acid in complexes depended on the ultrasound power. Scanning electron microscopy shows starch–caffeic acid complexes exhibit obvious dense network structure with increasing ultrasound power. X-ray diffraction results indicate the presence of V-type crystalline polymorph between starch and caffeic acid under high power of ultrasound irradiation. The starch–caffeic acid complexes can significantly inhibit the swelling power of starch granules at high temperature and increase the solubility of starch granules. Furthermore, the in vitro digestion of starch–caffeic acid complexes is estimated, and the result shows that the resulting complexes from ultrasound have lower digestion properties. Taken together, it is proposed that ultrasound technology is an effective method for preparation of starch complexes with potential as a functional food and drug delivery system.
研究领域:
食品科学
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化学工程
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生物技术
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产品关联
DOI
高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Yadi Huang,Juan Wu,Shengsong Deng,Fenghe Li,Xialing Bian,Xiaowen Li,Risheng Yao
Polymer nanoparticles have made progress in pharmaceutical nanotechnologies due to their efficient drug delivery. However, considerable amounts of surfactant are required during polymerization, which inevitably brings some potential problems. Herein, template polymerization is utilized to synthesize polyacrylic acid/soluble starch (PAA/SS) complex nanoparticles by surfactant-free polymerization. As a template, soluble starch (S-starch, SS) nanoparticles are obtained by nanoprecipitation due to their polyhydroxy structure. The resultant complex nanoparticles with pH sensitivity have core–shell structures, which facilitates their use as nanoparticles in preparation of gelatin-like materials. Another interesting property of PAA/SS complex nanoparticles is that the SS template can be removed by α-amylase, then PAA nanocapsules are obtained. A hypothesis for the mechanisms of PAA/SS complex nanoparticles formation and PAA nanocapsules preparation with α-amylase is also proposed.
研究领域:
药物纳米技术
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高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Xue-Li Liu,Kun Zhang,Yu Hu,Zhengjuan Zhang,Jun Chen,TianLin Ma,JiaJia Wang
A new class of hydroxypropyl starch, γ-hydroxypropyl starch (γ-HPS), is synthesized by using 3-chloropropanol as the etherifying reagent. Two independent procedures for the determination of the number of moles of alkylene oxide combined per anhydroglucose unit (molar substitution, MS) in γ-HPS are described. The feasibility of the Zeisel-gas chromatographic technique and colorimetric determination are testified, and especially in the second approach, the stability and accuracy of dehydration process are also investigated. The concentrated sulfuric acid dehydration oxidation is replaced with 2-iodoxybenzoic acid oxidation while retaining the same acid degradation and the same ninhydrin color reaction. Furthermore, the reliability and the range of application of the methods are tested by analyzing three samples of γ-HPS and unmodified starch derivatives, and the results indicate that values of MS are in good agreement with each testing method.
研究领域:
食品科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2019
·
IF 1.795
Li Guo,Hui Li,Lu Lu,Feixue Zou,Haiteng Tao,Bo Cui
To illuminate the relationship between the branch chain structures and physicochemical characteristics of cassava starch and to expand the range of its functionality, cassava starch granules are modified with sequential α-amylase from hog pancreas , barley β-amylase, and transglucosidase from Aspergillus niger . The molecular weight and amylose contents of the enzyme-modified starches decrease, and the modified starches exhibits increased numbers of short and medium chains and a higher branch density compared with those of control starch. The crystal pattern is transformed from A-type to a mixture of A-type and V-type, and the crystallinity is reduced. The enzyme-modified starches exhibits increased solubility and paste clarity, a more homogeneous crystal distribution, and reduced gelatinization temperatures, gelatinization enthalpy, and viscosity compared with those of control starch. The enzyme-treated starches exhibit a larger elasticity modulus, a viscous modulus, and a reduced loss angle tangent when the range of the transglucosidase treatment time is from 2 to 4 h, whereas the opposite effect is observed when the transglucosidase treatment time ranges from 8 to 10 h. These findings demonstrate that the rheological properties of the enzyme-modified starch are significantly dependent on the time of the transglucosidase treatment. Thus, triple enzyme modification may supply a new potential method to obtain the expected hydrophilic, rheological, and thermal properties of cassava starch.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
高影响因子
STARCH-STARKE
·
2019
·
IF 1.795
Jia Shao,Zheng Zhang,Shixing Zhao,Sui Wang,Zhiyong Guo,Hongzhen Xie,Yufang Hu
As promising soft materials, various excellent properties of hydrogels have received widespread attention during recent years. Mechanical properties and self-healing performance are required characteristics for hydrogels in practical applications. An important challenge is to develop hydrogels exhibiting mechanical performance and self-recoverability through physical cross-linking. In this work, the authors report a hydrogel consisting of a fully physically linked poly (vinyl alcohol)/agarose (PVA/AG) dual-network, which is of high toughness and self-healing properties. The synthesis process of the PVA/AG hydrogel is convenient, with AG as the first network, and hydrogen bonding and crystal-associated PVA as the second network to form a dual physical crosslink. Due to this physical cross-linking, the PVA/AG hydrogel has good mechanical properties (tensile strength of 6.5 MPa to 14.6 MPa, ductility of 168% to 214%). The highest compressive strength of hydrogel is up to 3.66 MPa, which is almost 8 times that of pure PVA hydrogel. In addition, it has excellent self-healing properties without stimulation or healing agents. Compared to pure PVA hydrogel, PVA/AG hydrogels have higher thermal stability due to higher decomposition temperatures and lower degradation rates. In this study, the authors also initially explore the potential application of obtained hydrogel.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2024
·
IF 2.6
Shaomin Kang,Jiaqi Guo,Igor S. Makarov,Mohammad Rizwan Khan,Huining Xiao,Junlong Song
Cationic starch serves as a prevalent wet-end additive in the papermaking industry. Yet, the definitive effects of the ratio between the two principal components—amylose (AM) and amylopectin (AP)—and the degree of substitution (DS) on the mechanical strength enhancement of paper sheets remain incompletely understood. This study synthesizes a series of quaternized amylose (QAM) and quaternized amylopectin (QAP) with varying DS levels and blended these derivatives in diverse ratios. Subsequently, these mixtures are integrated into pulp suspensions to ascertain the DS and the AM-to-AP ratio that optimize paper strength. These results indicate that a QAM-to-QAP blend with a DS of 0.08 at a ratio of 2:8 yielded the most pronounced improvement in paper mechanical properties. This precise formulation significantly enhances tensile, burst, and tear strength indices, increasing by approximately 55.0%, 44.4%, and 78.4%, respectively, under the most favorable conditions and with an additive dosage of 1 wt.%. This investigation provides substantive and actionable knowledge for selecting starch additives in the wet-end of papermaking, which can significantly augment the efficiency and efficacy of paper manufacturing processes.
研究领域:
造纸科学
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材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Xiaodong Bai,Xuepeng Zhang,Yuqian Xu,Xuemei Yong
A graft copolymer is synthesized with graft copolymerization of acrylamide (AM) and 1-vinyl-2-pyrrolidone (NVP) grafting onto sodium carboxymethyl starch (CMS) via central composite design (CCD). The initiation system consists of potassium persulfate (KPS) and sodium hydrogen sulfite (SBS). The copolymer is confirmed by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, scanning electron microscopy, thermogravimetric experiment, and elemental analysis. The rheological performance, filtration loss, cake thickness, and cake fictional coefficient of the drilling mud containing copolymer are evaluated. The results show that copolymers have ability to thicken and reduce filtration volume and have no obvious influence on the thickness and fictional coefficient of the mud cake. Response surface methodology (RSM) is exerted for variable evaluation and optimization. The results indicate that initiator concentration is the main contributing factor to decrease filtration volume and the optimum results are 1.5 wt% (initiator concentration), 1.82 (mole ratio of monomer to starch [AGU]), 66.02 °C (reaction temperature), 3.87 h (reaction time). The predicted value and the actual experimental value are 8.64 and 9 mL respectively with an error of 4.01%. The small error indicates that there is a small deviation between the actual and the predicted values, which also shows that the model is reasonable.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2021
·
IF 2.741
Bin Li,Ruijun Gao,Ling Wang
For improving the workability of clay-containing cement paste superplasticized by polycarboxylate ether (PCE), a new starch-based sacrificial agent is synthesized in the following two steps: first, the starch is sulfonated to obtain sulfonated starch (SS) with a strong steric effect, which is verified through its dispersion performance; then, SS is quaternized to obtain starch-based sacrificial agent (SSB). The structure of SSB is characterized by FT-IR and element analysis. Montmorillonite (MMT), as the most detrimental clay, strongly perturbs the dispersing power of conventional PCE. Therefore, the MMT-tolerance property of SSB is tested. With the addition of 0.02 wt.% SSB, the fluidity of MMT-containing cement paste is increased from 191.5 to 222 mm and the rheological property of MMT-containing cement paste is improved by reducing the yield stress and the flow index ( τ 0 and n in Herschel-Bulkley model). Adsorption experiments, DLS, and XRD are used for explaining SSB's clay-tolerance mechanism. Adsorption experiments show that the cationic group enhanced the interaction between MMT and SSB; DLS and XRD demonstrated that SSB is adsorbed on MMT through electrostatic attraction and could hinder the interaction between PCE and MMT by its high steric effect.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）