JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·
IF 5.3
Song Jie,Zhang Rong,Han Jiaxuan,Dou Yufang,Yu Shuang,Ma Xiaoyan
To improve the performance of biodegradable materials and endow them with functionality, luteolin (Lc) was modified by esterification with acetyl chloride (Ac), iso butyryl chloride (Ic), benzoyl chloride (Bc) to improve its hydrophilicity and hydrophobicity, and Ac-L, Ic-L and Bc-L esters were obtained. The three esterified compounds were characterized and blended with PBS to prepare PBS/Ac-L, PBS/Ic-L and PBS/Bc-L composites. Studied the interface interaction mechanism, crystallization performance, thermodynamic performance, hydrophilic properties, and antibacterial performance between composite materials. The results showed that the majority of Ac-L, Ic-L, and Bc-L were dispersed in the PBS matrix, with a tighter two-phase interface and higher dispersibility. There were electrostatic adsorption, hydrogen bond and other interactions in the composite system, and the Intermolecular force became stronger and the compatibility increased. The introduction of Ac-L, Ic-L, and Bc-L did not change the crystal structure of PBS, but the crystallization rate and crystallinity of the composite material increased. The thermal decomposition temperature of composite materials increased, and the thermal stability and mechanical properties were further enhanced. With the increase of the amount of Ac-L, Ic-L, and Bc-L added, the antibacterial and hydrophobic properties gradually enhanced, making it suitable for use as a preservation and antibacterial material.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Suling Liu,Qing Zhang,Shaheng Gou,Lili Zhang,Zhiguo Wang
Deep eutectic solvents (DESs), as emerging green solvents, provide a new opportunity for the biorefinement of biomass, component extraction, and cellulose nanofibrillation. Herein, different carboxylic acid-based DESs were applied for preparation of cellulose nanofibers (CNFs) from cellulose raw materials accompanied by simultaneous esterification modifications of CNFs. The results showed that pretreatment of DESs combined with mechanical treatment can swell and esterify the cellulose materials, producing CNFs with widths less than 100 nm. The DES pretreatment temperature played important roles in the esterification modifications and nanofibrillation of cellulose. The esterification modifications of cellulose prevented the over-hydrolysis and dissolution of cellulose during the DES pretreatment, guaranteeing CNFs with high yields of 72 %–88 % and maintaining the cellulose I crystal structure. Moreover, the esterified CNFs were used as a reinforcement to prepare CNF-strengthened polylactic acid (PLA) composites. The surface esterification of the CNFs improved their dispersibility and interfacial compatibility with PLA, thereby achieving the mechanical enhancement of CNF/PLA composites.
研究领域:
材料科学
·
生物质化学
·
绿色化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Wenzhi Zhang,Zhonghua Mu,Guohua Dong,Liguo Wei,Liming Bai,Meiling Fu,Xiaodan Zhao,Song Han,Shuo Wang
The natural starch (NS) is modified by an esterification process which is accomplished by reacting the NS and phosphate together with urea via a facile alcohol solvothermal method. After modification, a series of obvious variations can be easily confirmed for the resulted starch phosphate carbamides (denoted as SPC) compared with that of NS, such as the introduction of new groups of C O, P O, P-O-C and P-O-H together with new elements of N and P in starch molecular structure unit confirmed in FT-IR and XPS analyses and the decreased crystallinity along with formed surface defect demonstrated in XRD and SEM measurements. Furthermore, the formed SPC has a higher viscosity of 480 mPa.s −1 and lower gelatinization temperature of under 10 °C than that of the NS. More importantly, when the SPC is utilized as outer coating material together with ethylcellulose (EC) as inner coating material for preparing double-layer slow-release urea (denoted as EC/SPC based SRU), the EC/SPC based SRU has a desirable slow-release behavior with release percentages of 40.9% for 12 h in water and merely 59.6% for 20 day together with even exceeding 30 days in soil. Conclusively, this work provides a facile preparation approach for the SPC and its creative application for the preparation of SRU.
研究领域:
农业科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Wei Zhao,Zilu Liu,Song Yang,Na Xu,Xiaokun Li,Gan Luo,Zhenjiang Wu,Shoujun Liu,Chao Yang
An aqueous carbon black slurry was prepared by esterifying polystyrene-maleic anhydride with isobutanol as the esterifying agent and using the esterified product as a dispersant for carbon black. The effects of grinding time and dispersant addition on the ground particle size of carbon black before and after the esterification modification were investigated, as well as the effect of SMA dispersant on the dispersion stability of carbon black. The carbon black slurry was investigated by introducing external conditions such as temperature and pH, and the microscopic dispersion of the ink was observed by SEM. The results showed that the dispersion effect of the isobutanol-modified SMA was stronger than that of the unmodified SMA, the particle size of the carbon black paste reached 84 nm with the best stability when the dispersant was added at 4 % and the grinding time was 120 min. FTIR and XRD results showed that the surface groups of the carbon black interacted with the groups of the dispersant to achieve dispersion stability. This study not only provides directions for the selection of dispersant for carbon black in new aqueous media but also confirms the practicality of black colour pastes in gel inks and provides a theoretical reference for the development of pigment-based gel inks.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 19
·2586
·
IF 4.9
Jia-Ning Meng,Dan Qiu,Tao Yuan,Ya Li,Huang Huang,Ling-Hui Wang,Ya-Juan Wang,Rui Wang,Chang-Zi Jin
Cellulose nanofibers (CNFs) are highly promising nanocarrier materials, boasting excellent drug adsorption and loading potential due to their tunable hydrophilic/lipophilic interfaces. This study is the first to report the successful synthesis of maleic anhydride-modified CNFs (MA-CNFs) via the esterification of CNFs using a solvent-free molten maleic anhydride (MA) system, and it systematically evaluates MACNFs’ dual adsorption performance for water-soluble and lipophilic drugs. A new characteristic peak at 1723 cm −1 in FT-IR confirms the formation of ester bonds, proving the successful grafting of MA onto CNFs. XRD analysis shows that the crystallinity slightly increases from 72.56% to 74.06%, indicating the reaction mainly occurs in the amorphous region. After modification, the material’s hydrophobicity is significantly enhanced (water contact angle: ~63.3° for CNFs vs. ~74.9° for MA-CNFs), and its BET specific surface area rises sharply from 5.03 to 26.29 m 2 /g. These structural advantages collectively enable MA-CNFs to have adsorption capacities for folic acid (FA, water-soluble) and vitamin E acetate (VEA, lipophilic) that are 1.15 and 2.04 times those of CNFs, respectively. The results demonstrate MA-CNFs are high-performance functional materials fabricated via a green method, with good biocompatibility.
研究领域:
纳米医学
·
药物递送
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生物材料
·
高分子化学
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药剂学
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表面改性
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产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 4
·585-589
·
IF 0.875
Wei Qi,Wang Liyuan
Molecular glass resist has been considered as one of the best choices for a new generation of lithography. In this work, a new type of photoactive compound was obtained by the esterification of tannic acid with 2-diazo-1-naphthoquinone-4-sulfonyl chloride(2,1,4-DNQ-Cl) and ditertbutyl dicarbonate. The new obtained compound possessed both a photosensitive group of diazonaphthoquinone sulfonate(2,1,4-DNQ) and a group of acidolytic protection. Upon the irradiation of the compound under 365 nm light, the former group was photolyzed and converted into indene carboxylic acid along with a small amount of sulfonic acid, which could lead to the deprotection of the latter group. As a result, a novel i-line molecular glass photoresist was formed with the chemical modification of tannic acid. The experimental results show that the modificated compound had a fair solubility in many organic solvents. The lithographic performance of the resist was evaluated on an i-line exposure system with high photosensitivity and resolution as well.
研究领域:
材料科学
·
微纳加工
·
高分子化学
·
光电子学
·
半导体工艺
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）