Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2003-2011
·
IF 1.637
Hua Rui,Li He,Liu Xiao-Qin,Liu Ding-Hua
With an increasing demand for green chemistry and sustainable development, it is needed to design a solid base with high catalytic activity, excellent stability and reusability. In this work, a new kind of magnetic solid basic catalyst KF/CaO–CoFe 2 O 4 was prepared by the method including co-precipitation and isochoric impregnation, and it was successfully applied in the preparation of polycarbonate diol (PCDL) from the transesterification of 1,4-butanediol with dimethyl carbonate. The characteristics and properties of the catalyst were examined and analyzed by XRD, TEM, CO 2 -TPD and VSM. The effects of various parameters such as shell-core mole ratio, KF loading, calcination temperature, catalyst dosage, and the mole ratio of the raw materials on the yield of PCDL were investigated and the yield of PCDL can reach to 71.2% under the optimal reaction conditions. In addition, the catalyst can be easily separated by an external magnet after reaction, and the catalytic activity of the catalyst can well be maintained for 4 cycles.
研究领域:
化学工程
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材料科学
·
催化
·
绿色化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56359
·
IF 2.7
Guixin Zhang,Shuxian Weng,Jie Wang,Zhimin Kou,Meiting Liu,Guoqiang Zhu,Lihong Hu,Yonghong Zhou
Polylactic acid (PLA) is a new type of biodegradable material that has been applied in many fields such as extrusion, injection molding, film drawing, and spinning. In contrary, it does not have flame retardancy. In this paper, N-PCDL was synthesized by amidation reaction between COOH of PCDL and NH 2 of tetraethylenepentamine (TEPA), followed by an Atherton-Todd reaction of unreacted NH 2 at the other end of TEPA with P H of DOPO to prepare a novel lignin-based flame retardant containing nitrogen and phosphorus (NP-PCDL). The Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic hydrogen spectroscopy ( 1 H NMR) analysis results showed that proton peaks of CO NH , P N , and NH appeared in the NP-PCDL spectrum, while the characteristic absorption peak of P H bond disappeared in DOPO, the X-ray photoelectron spectroscopy (XPS) results showed that the degraded lignin consisted of elements C and O, while NP-PCDL consisted of elements C, O, N and P. The above results indicated that NP-PCDL was successfully prepared. NP-PCDL accounted for 3% (mass percentage, the same below), 5% and 10% of PLA, then lignin based flame-retardant PLA composites were prepared by internal mixing and injection molding. Thermogravimetric analysis (TGA) showed that the residual carbon of PLA/3% NP-PCDL, PLA/5% NP-PCDL and PLA/10% NP-PCDL at 800°C were higher than that of pure PLA, with the increase of 56.56%, 97.54%, and 301.64%, respectively; The analysis of SEM, XPS, and Raman showed that PLA/NP-PCDL formed dense, regular and highly graphitized residual carbon with phosphorus nitrogen structure during the combustion process. At the same time, NH 3 , H 2 O and PO˙ free radicals were released, which could dilute combustible gases, destroy free radical chain reaction, isolate combustible gases and heat, so as to play a flame-retardant role.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2015
·Vol. 73
·期 3
·647-659
·
IF 1.438
Liu Jingcheng,Liu Qiuhua,Zheng Xiangfei,Liu Ren,Mu Qidao,Liu Xiaoya
Two kinds of UV-curable polyurethane acrylates (PCDL-H-PUA and PCDL-P-PUA) were synthesized starting with polycarbonate diols (PCDL), isophorone diisocyanate and dimethylolpropionic acid and terminated with hydroxyethyl methacrylate or pentaerythritol triacrylate to impart mono-methacrylate or tri-acrylate end-group functionality, respectively. The structures and properties of the products were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, gel permeation chromatography and thermogravimetric analysis. The average molecular weights were between 7500 and 9300 g/mol, and the thermal properties of the products were excellent. The influence of the functionality of the end-capping functional group on the UV-curing behavior was investigated using real-time spectroscopy. Results showed that curing rate and conversion of PCDL-P-PUA were higher than those of PCDL-H-PUA, and the final double bond conversion of the polymers reached 95 %. PCDL-H-PUA and PCDL-P-PUA were applied to negative photoresists as the main film resin. The resolution of the optimal photoresist reached 40 µm.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Fei Gao,Jiancheng Cao,Qibo Wang,Ren Liu,Shengwen Zhang,Jingcheng Liu,Xiaoya Liu
A series of ultraviolet (UV)-curable self-healing polyurethane (PU) oligomers were synthesized by incorporating different contents of 2-ureido-4[1H]-pyrimidone and polycarbonate diols (PCDL) with different molecular weights at the end of PU chains. The structure of the oligomers were determined through Nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared spectroscopy. The PU oligomers were used to produce UV-curable self-healing coatings, the properties of which were investigated and the properties of the coatings with different functionality were studied. The results revealed that the performance of the coating was higher when a higher molecular weight of PCDL was used and With functionality increasing, the crosslinking density of the coating ascends, resulting in higher self-healing temperature and upper pendulum hardness and gloss of the coating. To balance the self-healing ability and mechanical properties of the coating, a series of coating formulations were designed by adding different types and amounts of active diluents. Double bond conversion, thermostability, and self-healing ability were investigated to determine the effect of active diluents on coating performance. The results demonstrated that the resultant coating have excellent adhesion, gloss, and thermostability. Coatings prepared used all types of active diluents had favorable self-healing ability, except for that prepared using 2-acryloyloxymethyl-2-ethyltrimethylene diacrylate. Excellent self-healing and mechanical properties were obtained when 20 w.t.% of triethoxylated trimethylolpropane triacrylate was used.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Decong Kong,Meiqi Song,Yonghong Pan,Xierzhati Aimaier,Ye Tian,Rui Yang,Jing Huang,Yi Liu,Xiaomei Liu,Nikolai Boshkov,Botao Zhang,Hua Li
In this study, the interface-modified ternary blends based on polylactic acid (PLLA)-polycaprolactone (PCL)-polycarbonate diols (PCDL) were prepared via suspension flame spray. Morphological analysis showed that the interface modification of PCDL significantly improves the compatibility of PLLA and PCL. Mechanical analysis revealed that the addition of PCDL resulted in great enhancement of the toughness of the PLLA/PCL composite coatings with a dramatic 326 % increase of the fracture strain for 10PLLA/90PCL/10PCDL compared with 10PLLA/90PCL. Further physicochemical and antibacterial test revealed no significant difference among PLLA/PCL and PLLA/PCL/CAM composite coatings with and without PCDL. Time-course release analysis showed that the release mechanism of the composite coating generally remains the same when the PCDL added is lower than the main components in PLLA/PCL, and even changed from the original abnormal diffusion to Fick diffusion. Overall, the ternary blending approach of PLLA-PCL-PCDL using suspension flame spray is a promising technique with great potential drug-delivery applications with different mechanical requirements.
研究领域:
材料科学
·
生物医学工程
·
制药工程
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DOI
高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 9
·2638-2647
·
IF 2.347
Xie Yan,Lu Shaofeng,Shi Wenzhao,Wang Haizhu,Wang Kuang
Water-based polyurethane (WPU) provides a number of benefits over typical solvent-based polyurethane. WPU is more environmentally friendly, safe, and reliable. The WPU with polycaprolactone diol/polycarbonate diol (PCL/PCDL) complex soft segment was developed using a prepolymer technique to enhance the color depth of cotton knitted fabrics dyed with reactive dyes. The appearance, particle size, zeta potential, and viscosity of WPU emulsions were analyzed. The chemical structure, thermal stability, phase change performance, and topography of WPU films were characterized by Fourier-transform infrared (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and atomic force microscopy (AFM), respectively. The tensile and hydrophilic properties of the WPU films were examined by an electronic universal testing machine and contact angle goniometer, respectively. The K / S value, rubbing fastness, washing fastness, and wearability of finished and unfinished dark cotton knitted fabrics were measured. Simultaneously, the chemical structure and morphology of fabrics were investigated using FTIR and scanning electron microscopy (SEM). The results show the WPU-2 emulsion demonstrated excellent stability, and the WPU-2 film showed superior thermal stability. The K / S value of the dark cotton knitted fabric finished with WPU-2 emulsion (40 g/ l ) increased by 18.58 %, and the wet rubbing color fastness of the resulting fabric was enhanced. The SEM results show a layer of film covered the surface of the finished fabric. In summary, the WPU can provide a new technique for enhancing the color depth of fabrics.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 62
·期 17
·3979-3991
·
IF 3.9
Hongxiu Wei,Xiaofei Wang,Wenkai Liu,Shuohong Dong,Tiancheng Dai,Feng Luo,Zhen Li,Hong Tan,Jiehua Li
In this study, polyurethane (PU) hydrogels were synthesized via mercapto curing reaction to elucidate the effect of molecular interactions between isocyanate and soft segments on the properties of hydrogels. Further, the mesh size, mechanical properties, hydrophilicity, and biological properties of the PU hydrogels were determined. In the isocyanate series, the structural regularity and rigidity of 4,4′-dicyclohexylmethane diisocyanate (HMDI) favored the formation of hydrogel materials with small mesh size, high modulus, and low water absorption. In contrast, l -lysine diisocyanate (LDI) favored the materials with large mesh size, low modulus, and good hydrophilicity. In the soft-segment series, the strong hydrogen bonds of polycarbonate diol (PCDL) favored the formation of materials with small mesh size, dense cross-link points, and high modulus, whereas weak hydrogen bonds of polytetrahydrofuran ether glycol (PTMG) favored the hydrogel materials with small mesh size, few crosslink points, and low modulus. PU hydrogels exhibit excellent cytocompatibility, anti-cell adhesion, and anti-inflammatory properties. Therefore, this study offers valuable insights into understanding the chain structure and macroscopic properties, thus contributing to preparing PU hydrogels with varying performances, as desired. Graphical
研究领域:
材料科学
·
高分子化学
·
生物材料
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）