JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
·
IF 3.512
Pu-You Jia,Cai-Ying Bo,Li-Qiang Zhang,Li-Hong Hu,Meng Zhang,Yong-Hong Zhou
Epoxidized castor oil (ECO) and castor oil phosphate ester (COPE) were synthesized. Structure of two functionalized castor oil was characterized with FTIR and 1 H NMR. Property of poly (vinyl chloride) PVC blends plasticized with ECO and (COPE) as secondary plasticizer was studied. The results indicated that thermal stability of plasticized PVC blends was improved, LOI value of PVC blends cooperated with COPE could reach 27.8%, flame retardant performance of COPE was put into effect by promoting polymer carbonization and forming a consolidated and thick flame retardant coating, which is effective to prohibit the heat flux and air incursion.
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
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Zhu Xiong,Lisheng Zhang,Songqi Ma,Yong Yang,Chuanzhi Zhang,Zhaobin Tang,Jin Zhu
Blends of entirely bio-sourced polymers, namely polylactide (PLA) and starch, have been melt-compounded by lab-scale co-extruder with castor oil (CO) as a plasticizer. The enrichment of castor oil on starch had great effect on the properties of the blends. If the castor oil was mainly dispersed in PLA matrix, the properties of the blends were poor, but when the hexamethylenediisocyanate (HDI) was grafted on starch granules the ready reactions between the hydroxyl on CO and the isocyante on the HDI-grafted starch (HGSTs) brought CO molecules enriched on starch particles. DSC analysis shows that the CO layer on starch has a positive effect on the crystallization of PLA in the ternary blend. The accumulation of CO on starch greatly improves the toughness and impact strength of PLA/starch blends. The grafting content of HDI on the starch granules primarily determined the compatibility and properties of the resulted blends.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Mingxian Yu,Jingxian Zhang,Xiaoguang Li,Hanqin Liang,He Zhong,Yinsheng Li,Yusen Duan,Dong Liang Jiang,Xuejian Liu,Zhengren Huang
The preparation of concentrated suspensions with high stability is crucial for tape casting . Dispersant plays an important role in the developing of high solid loading slurries with low viscosity. In this study, castor oil, phosphate ester and castor oil phosphate were selected as dispersants for alumina suspensions. The interaction between dispersant and alumina powders was characterized in terms of adsorption and viscosity measurements. Results showed that castor oil phosphate is more effective dispersant for alumina slurries. The influence of dispersant content, binder content, plasticizer/binder ratio and solid loading on the green sheet and mechanical properties of as-sintered alumina samples were also investigated. It was shown that the optimized formulation for dispersant, binder, plasticizer/binder ratio and solid loading was 2.22 wt%, 5.90 wt%, 1.0 and 31 vol%, respectively. Alumina ceramics showed improved mechanical properties, with the indentation hardness and fracture toughness as 15.91±0.15 GPa and 4.29±0.06 MPa m 1/2 , respectively.
研究领域:
材料科学
·
陶瓷工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 5
·1949-1958
·
IF 2.097
Zou Heng,Cao Qin-bo,Liu Dian-wen,Chen Xiu-min,Jiao Yong
Abstract Improving the collecting ability of a collector is a crucial issue in phosphate flotation. In this work, ricinoleic acid (RA) was used as a collector for fluorapatite (FA, Ca 5 (PO 4 ) 3 F) flotation. There is an OH group in the middle of the RA molecule, and thus, hydrogen bonds (H-bonds) can be formed between RA species. The role of the H-bond between RA molecules in FA flotation was revealed by experimental and theoretical calculation methods. The flotation results suggested that RA was more efficient than oleic acid for FA flotation at pH 9. The RA − anion was chemisorbed onto the negative FA surface, forming calcium ricinoleate (Ca(RA) 2 ) precipitates. The crystallization of Ca(RA) 2 on the FA surface was aided by the H-bonds between RA species. On the other hand, the results of quantum chemistry calculations showed that the H-bond in Ca(RA) 2 resulted in the close packing of RA − anions. Such a packing structure may occur on the FA surface, which favors the formation of Ca(RA) 2 on the surface and FA flotation. Moreover, Ca(RA) 2 was more stable than calcium dioleate in solution, also contributing to the better flotation efficiency of RA. These theoretical calculation results clarified the beneficial effect of the H-bond between RA species on FA flotation at the atomic level. Graphic abstract
研究领域:
矿物加工工程
·
物理化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2018
·
IF 3.849
Haiyan Liang,Shanwen Wang,Heng He,Mengqi Wang,Lingxiao Liu,Jingyi Lu,Yi Zhang,Chaoqun Zhang
In this study, dimethylol propionic acid (DMPA) and dimethylol butanoic acid (DMBA) were employed to synthesize the castor oil-based waterborne polyurethane dispersions (PUDs). The effects of these two emulsifier and their contents on the properties of the PUDs as well as their films were investigated systematically. The results show that as the emulsifiers contents increase, the particle size and zeta potential of the PUDs decrease while the tensile strength of the resulting PU films increase but thermal stability, water and chemical resistance decrease. The PUDs from DMBA exhibit smaller particle size than those from DMPA and the films from the former show higher tensile strength, higher elongation at break but lower thermal stability, lower water resistance. This work provides a new way to synthesize environmental friendly bio-based waterborne polyurethanes whose properties can be tuned according to their application, such as coating, ink, leather, styling products and so on.
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
Coatings
·
2017
·Vol. 7
·期 10
·159
·
IF 2.175
Shaolong Li,Changlian Xu,Wenfeng Yang,Qingru Tang
We report an efficient and green approach to synthesize a linear castor oil-based polyurethane (CPU) without using any solvent or catalyst. Diol monomers were first synthesized by the aminolysis reaction between castor oil and diamines; this was accomplished within 6 h at 130 °C. Polymerization of the diols and isocyanate was further confirmed by Fourier transform infrared (FTIR),1H-nuclear magnetic resonance (1H-NMR), and gel permeation chromatography analyses. The resultant CPUs showed a good thermal stability with an initial degradation temperature higher than 300 °C, and their mechanical and wood bonding property can be modulated by the structures of diamine. In addition, the CPUs possessed a satisfying water resistance property with the water absorption amount lower than 2%. The green conversion of castor oil to thermoplastic polyurethane affords new opportunities in bio-based industries.Keywords:castor oil;linear polyurethane;catalyst-free;solvent-free
研究领域:
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jiawei Li,Hao Zhang,Chengyu Hong,Mengsong Liu,Yongquan Wang,Ye Han,Yutong Song,Chao Zhou
The utilization of green and sustainable bio-based resources gets more important owing to the increasing shortage of petrochemical resources. Arbutin (AT) was considered to belong to a class of renewable polyhydroxy compounds due to its unique molecular structure. Hence, a molecular structure design strategy was employed to incorporate AT and castor oil into the backbone of anionic waterborne polyurethan (WPU). The effect of the AT content on the characteristics of WPU dispersion and casting film was thoroughly investigated. The result showed that the WPU films had excellent transparency, mechanical (the tensile strength was 28.4 MPa, the toughness was 34.3 MJ/m 3 ), and thermodynamic properties, surpassing most current vegetable oil-based WPU systems. Notably, the WPU-AT20 film could pull target 18722 times its own weight, which could be ascribed to the cooperative effects of abundant rigid rings, H-bonds, and a higher physical crosslink density in systems. The T g values of the WPU films were adjusted to range from 13.47 °C to 63.40 °C. The maximum value of T g was, in particular, outstanding at present reported systems. Intriguingly, the WPU films still exhibited prominent anti-corrosion performance towards Q235# iron after severe weather conditions of outdoor storage for 4 months. The objective of this research was to offer simple and feasible strategies for preparing eco-friendly WPU coatings with excellent anti-corrosion performance.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2014
·
IF 0.473
J. J. Du,Y. Zuo,Q. Zou,B. Sun,M. B. Zhou,L. M. Li,Y. Man,Y. B. Li
Sponge-like polyurethane (PU) and composite have recently attracted attention in biomedical field as scaffolds for bone repair or tissue engineering research. In this study, castor oil was transesterified with glycerol to increase its functional hydroxyl groups and improve the mechanical properties of the resulting composite scaffolds. The glyceride of castor oil (GCO) was used to copolymerise with isophorone diisocyanate to generate PU, meanwhile blending with hydroxyapatite (HA) powder to prepare porous HA/PU composite scaffolds. The HA/glyceride based PU (GCPU) scaffolds were compared with pristine castor oil (PCO) based PU scaffolds (PCPU) by investigating the physicochemical properties and cytocompatibility using Fourier transform infrared, X-ray diffraction, SEM, mechanical testing and methylthiazolyldiphenyl-tetrazolium bromide assay. The results showed that the number of hydroxyl groups of GCO was nearly twice as high as that of PCO, which enhanced efficiently the crosslinking density of PU matrix. The compressive strength of HA/GCPU scaffold with 40 wt-%HA was ∼4·6 MPa, much higher than that (0·058 MPa) of HA/PCPU scaffolds. The in vitro biological results demonstrated that both GCPU and HA/GCPU scaffolds exhibited desirable cytocompatibility. The novel synthetic route is highly effective for the preparation of HA/GCPU porous scaffolds, which have good prospect in the repair of bone defects or for bone tissue engineering.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 4
·1-11
·
IF 2.8
Liang Miaoqing,Guan Fanglan,Zhang Mei,Nie Jinmei,Bao Lihong
Self-healing materials have gained significant attention due to their ability to autonomously repair damage, extending material lifespan. In this study, bio-based self-healing polyurethanes were synthesized using modified castor oil (MCO) as the soft segment and 5-(2-hydroxyethyl)- 6-methyl- 2-aminouracil (UPY) and 2,2'-diaminodiphenyldisulfide (DTDA) as dynamic components. The synergistic effect of quadruple hydrogen bonding and disulfide bonds was investigated by varying the n(UPY)/n(DTDA) ratio. Structural and mechanical properties were characterized using IR, DSC, TGA, XRD, and tensile testing. The results revealed that the castor oil-based polyurethanes exhibited transparency and amorphous structures, making them promising bio-based self-healing materials. When the DTDA content was 9.54% and the UPY content was 1.62%, the material achieved a self-healing efficiency of 96.38% under 80 °C for 12 h. Additionally, at a DTDA content of 6.65% and a UPY content of 2.43%, the tensile strength reached 17.76 MPa. Mechanistic analysis revealed that disulfide bonds played a dominant role in self-healing, while hydrogen bonds provided additional reinforcement. This work presents a novel bio-based polyurethane system with tunable mechanical and self-healing properties, contributing to the development of sustainable smart materials.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2012
·Vol. 62
·期 10
·1457-1464
·
IF 1.902
Youmei Bao,Jing He,Yuesheng Li
Hyperbranched polyesters with thioether linkages were facilely prepared from methyl 10-undecenoate, a castor oil-derived renewable chemical. The monomer was obtained in excellent yield through thiol–ene click chemistry in the presence of catalytic amounts of photoinitiator under UV irradiation. Subsequent bulk polycondensation via a transesterification process catalyzed by Ti(OBu) 4 , Sb 2 O 3 or Zn(OAc) 2 gave hyperbranched polyesters with high molecular weights and unusual crystalline properties. The degree of branching in the range 0.45 − 0.54 calculated from quantitative 13 C NMR spectroscopy and low inherent viscosities of 0.16 − 0.25 dL g −1 strongly confirmed the hyperbranched structures of the resultant polymers. © 2012 Society of Chemical Industry
研究领域:
材料化学
·
可再生资源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 6
·1765-1772
·
IF 1.584
Sardari Azam,Sabbagh Alvani Ali Asghar,Ghaffarian Seyed Reza
A castor oil-based fatliquoring agent for use in leather coating was prepared via Pickering emulsions stabilized by metal–organic frameworks (MOFs). The partially oxidized ZIF-8 (POZIF-8) nanoparticles were used as MOF in the presence of a castor oil-based dispersant. The results of the stability test showed that the presence of POZIF-8 nanoparticles leads to a stable oil/water emulsion with higher oil content than other nanoparticles, such as TiO 2 and ZnO. The stabilized structure of the prepared fatliquoring agent was characterized by transmission electron microscopy (TEM). TEM image indicated that the castor oil either was surrounded or was encapsulated by MOF. The prepared fatliquoring agent was applied to the leather. Then, in order to prove the existence of POZIF-8 nanoparticles in collagen fibers, the cross section of the fatliquored leather was examined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). These analyses revealed the good dispersion of POZIF-8 nanoparticles from grain to flesh side. The physical and mechanical properties of the fatliquored leather were compared with those of the control leather sample, which was fatliquored by a conventional agent. The results show that the prepared fatliquoring agent significantly improved mechanical properties, lightfastness, softness, and fullness of leather.
研究领域:
材料科学
·
皮革化学与工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Wei Wang,Dan Feng,Yue Zhang,Ling Lin,Haiyan Mao
An eco-friendly halochromic smart polymer was fabricated via covalently introducing azobenzene moieties into castor oil-based waterborne polyurethane . Infrared spectrum and thermogravimetric analysis have confirmed the successful incorporation of azobenzene moieties into polyurethane chains. The halochromic polymer undergoes color change from yellow to amaranth due to the structure shifting from azo form to hydrazine form at pH < 5, showing a visually detectable color difference with the naked eyes. It is also found that the color is reversible by neutralizing treatment and the switching process can be repeated more than 10 times. This eco-friendly halochromic polymer is expected to prepare wearable and visual pH sensor as environment, health and food monitors.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）