RSC Advances
·
2018
·Vol. 8
·期 46
·26318-26324
·
IF 2.936
Xianbin Huang,Jinsheng Sun,Kaihe Lv,Jingping Liu,Haokun Shen
This study presents an alternative method to enhance the emulsion stability of oil based drilling fluids (OBMs). Modified dimer acid (MDA) was synthesized with a molecular structure having two hydrophilic heads and two hydrophobic tails. Theoretically, the adsorption of MDA on an oil–water interface makes it possible to increase hydrogen bonding between water droplets and form three dimensional networks which benefit emulsion stability. The influence of MDA on the stability of base emulsions was studied by visual observation. Then the stabilization mechanism of MDA was analyzed from the micro and macro points of view by morphology study using a cryo-scanning electron microscope (cryo-SEM) and rheological measurements including viscosity vs. shear rates, zero-shear viscosity (η0), and creep and recovery tests. Experimental results showed that a substantial improvement in emulsion stability was visually observed when the MDA concentration was 2 g L−1. From cryo-SEM observation, a honeycomb structure was observed in the emulsion containing 2 g L−1 MDA, which can provide a physical barrier to restrain the movement of water droplets. In comparison with the rheological behaviors of the emulsion without MDA, a remarkably larger zero-shear viscosity, a solid-like behavior and a greater elasticity were observed when 2 g L−1 MDA was present. Finally, the application in OBMs shows that MDA can largely enhance electrical stability (ES) and reduce the filtration volume. The method proposed in the paper could be used to enhance the stability of w/o emulsions in a variety of fields.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Dandan Li,Dinggen Hu,Jihuai Tan,Qinghao Zhu,Zhulan Liu,Chen Su,Jianbin Chen,Yunfeng Cao
Paper derived from lignocellulose has great advantages over plastics as packaging material, nevertheless, the poor water- and oil-resistances of paper-derived products limited their application in high-end field. Herein, novel dimer acid-based waterborne polyurethanes (DWPUs) with different content of dimer acid-based polyester polyol (DG) were prepared and used as water- and oil-resistant coating for paper substrate. The effects of DG contents on water- and oil-resistances, mechanical properties and thermal stability of DWPUs coated papers were systematically investigated. When the content of DG reached up to 7 wt% (based on polyester glycol), the paper coated by DWPU exhibited 88.06% decrease in Cobb 60 value, 8.7 times increase in kit rating compared with uncoated paper. Meanwhile, DWPUs coated papers showed good mechanical properties and thermal stability. These improvements are attributed to the flexible long-alkyl chain, and six-ring structure of DWPUs as well as the continuous and homogeneous DWPU-derived membrane on the surface of paper. This study provides a new framework for the preparation of high quality, multifunctional, environmentally friendly water- and oil-resistant coatings for paper substrates.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 34
·
IF 1.866
Jie Chen,Xiaoying Li,Yigang Wang,Jinrui Huang,Ke Li,Xiaoan Nie,Jianchun Jiang
A novel plasticizer epoxidized dimeric acid methyl ester (EDAMe) based on rubber seed oil was synthesized. Chemical structure of EDAMe was characterized by Fourier transform infrared (FTIR) and gel permeation chromatography (GPC). Effects of EDAMe as secondary plasticizer and its substitution of commercial plasticizer dioctyl terephthalate (DOTP) in soft poly(vinyl chloride) (PVC) films were studied. The thermal properties, mechanical properties and migration stabilities of PVC films were explored with DMA, TG, TG–FTIR, dynamic thermal stability analysis, tensile and migration tests. The results indicated that the epoxidized rubber seed oil based ester has significantly higher thermal stability than DOTP. When DOTP was substituted with 20% (m/m) EDAMe, the results of initial decomposition temperature ( T i ), 10% and 50% mass loss temperatures ( T 10 and T 50 ), and the first maximum weight-loss temperature rate ( T P1 ) reached 267.2 °C, 263.5 °C, 307.3 °C and 298.9 °C, respectively. Furthermore, flexibility of the obtained PVC films enhanced significantly with the adding of EDAMe. The migration stabilities of EDAMe was also investigated and showed good migration resistance. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43668.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 3
·1-12
·
IF 3.097
Lu Yunfan,Li Chen,Wu Ying
The dimer acid-based polyamide (DAPA) was prepared by polymerization of dimer acid and ethylenediamine. And the film was prepared by the solution casting method, in which tetrahydrofuran was used as the solvent. Glycerol is introduced into the film by adding glycerol together with tetrahydrofuran and smearing it on the glassware before the film’s formation. The paper has evaluated the DAPA film packaging performance, which has rarely been studied, such as oxygen barrier property and optical properties. Through forming the film by the two means of adding glycerol, the paper has studied its property on the mechanic, morphology, oxygen barrier. The results of which show the differentiation of producing film in two ways. The tensile strength and elongation at break were increased by 80% and 228%. And the oxygen permeability was 0.00732 cm 2 /m 2 ·dpa. The thermal processability of the film has been improved. Compared with other bio-based film, the DAPA film with glycerol solution has excellent mechanical properties, barrier property, and optical properties.
研究领域:
材料科学
·
食品包装技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Boxuan Yang,Yuxin Zeng,Tao Guo,Yuanzhong Lin,Lifeng Yin,Qingsong Hua
Hexafluoropropylene oxide dimer acid (HFPO-DA), an emerging persistent pollutant, has been prevalently utilized as an alternative to perfluorooctanoic acid (PFOA). Analogous to PFOA, HFPO − DA presents remarkable resistance against degradation by conventional technologies. In this study, we prepared Ce doped PbO 2 anode (Ce-PbO 2 ) and paired it with cathode to form redox system for the degradation of HFPO-DA in water. The results showed that the degradation rate of HFPO-DA over Ce-PbO 2 was as high as 1.67 × 10 −2 min −1 , much higher than that of Boron-doped diamond electrode (BDD, 6.84 × 10 –3 min −1 ). The Ce-PbO 2 anode also has the theoretical lifetime as high as 82.7 years. Free radical quenching experiments indicated that both reactive oxygen species (ROS) and reductive radicals contributed to the degradation of HFPO-DA. These degradation reactions start from a direct electron transfer, followed by electroreduction and a series of free radical reactions including decarboxylation, ether bond cleavage, and the “4A” processes (generation of Alkyl radicals, Alcohols, Acyl fluorides, and Acids in sequence) until it is decomposed into small molecules. Meanwhile, new intermediates (CF 3 CF 2 CF 2 OCF 3 CH•) generated by cathodic H• are dominating the reductive reaction during the electrochemical process. This “buttering bread on both sides” redox mechanism deepens the understanding of the degradation process of HFPO-DA and provides an efficient treatment strategy.
研究领域:
环境科学
·
电化学
·
污染治理
✓ 已验证
产品关联
DOI
高影响因子
Polymer-Plastics Technology and Materials
·
2019
·
IF 0
Xiao Zhang,Yanghui Jiang,Cong Jia,Panfang Lu,Hongkun Chen
The paper presents a new controlled release fertilizer coated by dimer acid-based polyurethane (PU). The structure and property of the sample were characterized. Results indicated that the polyether polyol modified PU (MPU) coating reduced water absorption rate by 72.1% after 29 d, and increased the cross-linking density by 23%, and decreased the coating porosity by 26%, Moreover, MPUFs and PUFs both exhibited excellent nutrient controlled release abilities, especially the MPUF possessed longer nitrogen release longevity (118 d,131%) compared with PUF (51 d). Thus, the high-performance MPUFs with environmentally friendly and excellent controlled release could be widely applied to agricultural fields.
研究领域:
材料科学
·
环境科学
·
农业化学
✓ 已验证
产品关联
DOI
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Changqing Peng,Dongmei Xie,Hongzhi Liu
Previous works have demonstrated that diisocyanate-induced dynamic vulcanization of difunctional fatty acid is an effective and promising strategy to highly toughen PLA. However, the effect of diisocyanate structure on the toughening of PLA remains unclear. For this sake, three diisocyanates with different molecular structures, that is, hexamethylene diisocyanate (HDI), 4,4-diphenylmethane diisocyanate (MDI), and dicyclohexylmethane 4,4′-diisocyanate (HMDI), were chosen to induce dynamic vulcanization of hydrogenated dimer acid (HDA) in the presence of PLA. The reaction rates of the diisocyanates with HDA were found to follow the following order: HDI > MDI > HMDI. The higher reactivity of diisocyanates resulted in better interfacial compatibility between the in situ formed polyamide elastomer and PLA components. PLA blends utilizing MDI or HMDI with cyclic structural units have superior tensile strength (TS) and tensile modulus (TM) but minimal improvement in tensile ductility. Among the three PLA blends, the PLA/(HDA + HDI) blend exhibited a bi-continuous morphology and the highest toughness, with an elongation at break of 283.4% and a notched impact strength of 80.1 kJ/m 2 . This work would offer guidance for the development of high-performance PLA blends prepared by dynamic vulcanization of reactive monomers.
研究领域:
高分子科学
·
材料工程
·
化学反应
·
纳米复合材料
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Shuang Liang,Hengkun Zhao,Xiangyuan Li,Yu Feng,Jingbo Zhao
Dimeric acid (DA) is a biobased derivative of plant oil. Its polyamides are usually weak polymers with a low melting point. In this work, an efficient strategy was developed to enhance the thermal and mechanical properties of DA polyamides (DAPAs). Two H2N-terminated DAPA prepolymers (DAPAhs and DAPAddas) were synthesized through melt polycondensation of dimeric acid with hexanediamine and decanediamine (DDA), respectively. Diethyl oxalate was used as a chain extender to increase the molecular weight, and modified DAPAs (DAPAhs-DEO and DAPAddas-DEO) were obtained. Short and easy crystallizable oxamide hard segments effectively improved the mechanical properties, crystallization, and hydrophobicity of the DAPAs. The biobased modified DAPAs exhibited good tensile strength up to 27 MPa, Tm between 105 and 151 °C, and water contact angles from 84 to 98°. Compared to DAPAhs-DEO, DAPAddas-DEO exhibited better comprehensive mechanical properties because longer DDA segments made the oxamide segments far from bulky DA segments and the oxamide segments in adjacent main chains approached easier. Different from brittle 65DAPAh, 65DAPAh-DEO, 65DAPAdda, and 65DAPAdda-DEO showed good peel strength on the aramid fabric. A simple and efficient method was established to prepare biobased DAPAs with excellent properties.
研究领域:
材料科学
·
聚合物化学
·
生物基材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Bowen Xu,Qichen Yin,Feilong Han,Jue Cheng,Jingbo Zhao,Junying Zhang
Bio-based, healable, and recyclable polyurethane materials conform to the sustainability of the polyurethane industry. By introducing dynamic covalent bonds, the cross-linked polyurethane can obtain the performance of network rearrangement, thereby realizing self-healing and reprocessing. In this work, a self-healing/renewable polyurethane based on bio-based vanillin and tyrosine was successfully synthesized solvent-freely and catalysts-freely. Due to two different thermal reversible mechanisms, metathesis of imines and deblocking/re-blocking of phenolic urethanes, the obtained PU has considerable self-healing efficiency and renewability. At 120 °C, the surface scratches almost completely disappear within 90 min, and the tensile strength can be restored to ∼ 95% within 2 h. After remolded for 5 times, the chemical structure, glass transition temperature, deblocking behavior, tensile strength, elongation at break and gel content didn’t change significantly. Both the environmental friendliness of bio-based raw materials and the renewability of the obtained polyurethane materials meet the requirements of sustainability.
研究领域:
材料科学
·
可持续化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Dengdiao Yao,Jian Shao,Dantong Jia,Weiling Sun
Hexafluoropropylene oxide dimer acid (HFPO-DA) and perfluoroethylcyclohexane sulfonate (PFECHS) are increasingly used as alternatives for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). However, their immunotoxicity and underlying molecular mechanisms remain poorly understood. Here, to assess immunotoxic effects, zebrafish embryos were exposed to environmentally relevant concentrations of PFOA, PFOS, HFPO-DA, and PFECHS for four days. Results revealed that all four per- and polyfluoroalkyl substances (PFAS) resulted in decreased heart rate and spontaneous movement, and induced oxidative stress in zebrafish larvae. Notably, HFPO-DA exhibited more severe oxidative stress than PFOA. Immune dysfunction was observed, characterized by elevated cytokine, complement factor, nitric oxide, and neutrophil content, along with a significant decrease in lysozyme content. Transcriptomic analysis revealed the activation of Toll-like receptor (TLR)/NOD-like receptor (NLR)/RIG-I-like receptor (RLR) and associated downstream genes, indicating their pivotal role in PFAS-induced immunomodulation. Molecular docking simulations demonstrated stable interactions between PFAS and key receptors (TLR2, NOD2 and RIG-I). Overall, HFPO-DA and PFECHS exhibited immunotoxic effects in zebrafish larvae similar to legacy PFAS, providing important information for understanding the toxic mode of action of these emerging alternatives.
研究领域:
环境毒理学
·
免疫学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 9
·1199-1211
·
IF 1.906
Liang Shengyuan,Xu Kai,Liu Hongbo,Gui Xuefeng,Zhang Tian
UV-curable epoxy acrylate oligomer was synthesized via one-pot and two-step method by the ring-opening reaction of bisphenol-A epoxy resin (DGEBA) with dimer acid (DA) and acrylic acid (AA) in this paper. The molecular chain was firstly extended with DA. Then, AA, as a blocking agent, played the role in introducing unsaturated bonds to the chain. The water-based dispersion of epoxy acrylate was fabricated by subsequent phase-inversion emulsification in the presence of methacryloxypropyl silsesquioxane (MASQ). Compared with the traditional UV-curable epoxy acrylate, emulsions contain much less volatile organic compounds (VOC), which are more widely used in the coating industry. Because of the introduction of unsaturated bonds, MASQ participated in free-radical polymerization when incurred by UV, resulting in a better compatibility with epoxy acrylate. The cured samples were characterized with dynamic thermomechanical analysis (DMA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and contact angle measurement (CA). The results indicated that the thermal property, flexibility, and water resistance all improved with the increasing proportion of DA, which may contribute to the long hydrophobic chain. Besides, the organic-inorganic and cage-like structure of MASQ also contributed to the enhancement of thermal property, water resistance, glass transition temperature, and storage modulus. With the above favorable properties and performances, the dimer fatty acid epoxy-acrylate resins will demonstrate promising applications in waterborne coatings.
.
研究领域:
材料科学
·
化学工程
·
高分子科学
·
涂料技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yeyun Meng,Shengyuan Liang,Zixia Zhang
In recent years, the growing awareness of environmental protection has led to significant attention being directed toward fluorine-free water-repellent agents in the textile industry. In this study, we developed an environmentally friendly approach to synthesize a bio-based fluorine-free branched polyurethane water-repellent agent specifically designed for cotton fabrics (CFs). The synthesis process involved three sequential steps: First, epoxy soybean oil polyol (DESO) was prepared through the reaction of soybean oil with dimeric acid. Subsequently, reactive waterborne polyurethane (RDPU) was synthesized by combining DESO with isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and 2-hydroxyethyl acrylate (2-HEA). Finally, the bio-based fluorine-free branched polyurethane water repellent (HPU) was fabricated by utilizing RDPU as the primary component, with PET4A serving as the crosslinking agent and SA as the co-monomer. The results demonstrate that CFs treated with the HPU water-repellent agent performed outstandingly, achieving an exceptional water-repellency rating of 95 and a high water contact angle (WCA) of 145°, as well as remarkable surface stability. Furthermore, the softness of the finished CFs was objectively evaluated using an instrument. The results showed that the finished CFs possessed high softness, which was mainly attributed to the introduction of long alkyl chains.
✓ 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）