INDUSTRIAL CROPS AND PRODUCTS
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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
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产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Wei Hong,Chuntian Zhang,Jing Sun,Shu Wu,Kaijun Zhang,Jinming Wang,Zhanmei Xiao,Heng Zhang,Qingshan Li,Guangzhong Xing
This paper first designed the molecular structure of the water-soluble polyurethane phase change material. Taking HDI (hexamethylene diisocyanate), PEG (polyethylene glycol), chain extender (DMPA (dimethylolpropionic acid), BDO (1,4- butanediol), EDA (ethylenediamine)), catalyst (DBTDL (February acid dibutyl tin)), neutralizing agent (TEA (triethylamine)) as the raw material, the paper then prepared the waterborne polyurethane phase change material, which is available for wet spinning process. The particle size, appearance, storage stability, water absorption, tensile strength and elongation at break of the WPUPCM emulsion were then tested. Moreover, the influences of reaction temperature, reaction time, R value (ie -NCO / -OH molar ratio), PEG relative molecular mass and DMPA content on the WPUPCM performance indicators were investigated. The study indicated that reaction temperature, reaction time, R value, PEG relative molecular mass and DMPA content show various influences on WPUPCM performance indicators. Therefore, in order to meet the requirements of practical application and determine optimal formulation and process parameters, further relevent studies based on comprehensive considerations of all factors are needed.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 12
·
IF 1.64
ShaoJun Peng,Yong Jin,Tongbing Sun,Rui Qi,BaoZhu Fan,XinFeng Cheng
A series of waterborne polyurethane dispersions were synthesized by one-pot reaction and step-wise reaction, respectively. The effects of synthetic methods and DMPA content on the particle size distribution (PSD), solid contents and viscosity were studied by laser particle size analyzer, Brookfield viscometer and TEM analysis. High solid content and low viscosity waterborne polyurethanes (WPUs) with controllable bimodal PSD were prepared by one-pot reaction using 2,2-dimethylol propionic acid (DMPA) as the only self-emulsifier. Meanwhile, 40% solid content WPUs with unimodal PSD were obtained by step-wise reaction at the same formula. With the increment of DMPA content, the ratio of large particles to small particles decreased and two peaks of the particle size finally became one peak by one-pot reaction while the PSD remained unimodal by step-wise reaction. The reason leading to the difference of PSD between one-pot reaction and step-wise reaction was analyzed and the relationships among PSD, viscosity and solid content were discussed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40420.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
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2025
·
IF 4
Yan Zhou,Jia Liu,Xiang-Yu Zhao,Wen-Jia Yang,Michael J. Adang,Guang-Mao Shen
The prolonged use of traditional chemical pesticides has led to the emergence of resistance in pest populations, and the discovery of bioactive compounds with novel insecticidal mechanisms offers a promising strategy to broaden the current repertoire of pest management approaches. Natural compounds derived from plants constitute a vast resource for the development of novel pesticides. As a carnivorous plant, Nepenthes × ventrata is capable of secreting a diverse array of compounds that serve to attract and digest insects. In this study, the volatile organic compounds (VOCs) emitted by N. × ventrata were identified. Compared with leaves, 28 VOCs were highly enriched in the pitchers of N. × ventrata . Y-tube behavior assays demonstrated sporadic attractant activity of 2,2-dimethyl-4-pentenoic acid (DMPA) on Bactrocera dorsalis, whereas no significant attractive effects on Tuta absoluta and Drosophila melanogaster were observed. When administered via both fumigation and contact exposure, DMPA exhibited significant lethality against these three pests. Limited proteolytic mass spectrometry (Lip-MS) analysis revealed that two ferritins, Tafer1 and Tafer2, from T. absoluta interacted with DMPA. In conclusion, the DMPA secreted by N. × ventrata is characterized as a bioactive compound exhibiting insecticidal activity, and thus represents a promising candidate for development as a novel insecticidal agent.
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产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·1963-1976
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IF 2.3
Niu Pengfei,Pan Weichen,Wang Wei,Wang Meng,Zhang Bao,Yang Junfeng,Peng Xiaohong
Self-matting waterborne polyurethane (WPU) with a rough surface suffers from poor wear resistance, which inevitably hinders its service span. Here, wear-resistant and self-matting WPU resin was prepared via using hydroxypropyl-terminated polydimethylsiloxane (PDMS) in the preparation of prepolymer and N -2-aminoethyl-3-aminopropyltrimethoxysilane (KH-792) as a post-chain extender. The effects of PDMS, 2, 2-Bis(hydroxymethyl)propionic acid (DMPA), and KH-792 on its morphology, particle size, gloss, wear resistance, and hydrophilicity of WPU were also investigated. The gloss of WPU coatings was found to be negatively correlated with the amount of DMPA. Moreover, the matting effect and the wear resistance of WPU were significantly enhanced by the introduction of PDMS and KH-792. When the content of PDMS, DMPA, and KH-792 was 6 wt%, 2.2 wt%, and 40 mol% respectively, the gloss was 3.2 GU, and the wear mass loss was only 6.6 mg, which was 64% lower than that without silicone-modified. This work could provide a new idea for the preparation of wear-resistant and self-matting coatings.
研究领域:
材料科学
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高分子化学
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表面工程
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涂层技术
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 4
·e70085
·
IF 3.4
Ziyun Li,Qiwei Zheng,Menghan Zhong,Chao Wang,Shengwei Fang,Renfeng Zhou,Min Xia,Yanrong Jia,Juan Zhang,Peng Ye
Internal emulsification emulsions are environmentally friendly and do not emit volatile organic compounds (VOCs). However, their micelle interface, dominated by ionic hydrophilic groups, hinders cross-linking reactions and affects performance. We proposed a dual-functional micellar interface (DFMI) that distributes both ionic and reactive hydrophilic groups, enhancing cross-linking performance without significantly compromising emulsification properties. In this study, a series of sugar-based hyperbranched waterborne polyurethane emulsions were synthesized with 2,2-dimethylolpropionic acid (DMPA) as the ionic hydrophilic moiety. Dopamine (DA) was introduced at varying levels as the reactive hydrophilic moiety for terminal modification. The results showed that monomolecular micelles and vesicular micelles could be formed by symmetric and asymmetric modification of terminal DA. Symmetric modification tended to form unimolecular micelles, while asymmetric modification tended to form vesicular structures. Adhesion tests conducted after cross-linking with gelatin showed that the asymmetrically modified adhesives with seven-layer structured DA exhibited better cross-linking degrees. Adhesion performance and swelling tests confirmed that the asymmetric structure exposed more terminal reactive groups, enhancing the utilization of the modified groups, as indicated by dynamic light scattering (DLS) for emulsion particle size and surface zeta potential. This study successfully prepared hyperbranched polyurethane emulsions with tunable micelle morphology, balancing emulsification ability, and cross-linking degree, supporting the controlled emulsification of hyperbranched polymers and the development of bio-based adhesives.
研究领域:
材料科学
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环境科学
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生物化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 18
·
IF 1.768
Hongchuan Wu,Zhiguo Li,Libin Zhu,Jiyou Gu
Aqueous polyurethane micelles from 2,4,6-trichlorphenol blocking terminal-isocynate pre-polymer were prepared which could be de-blocked at low temperature. The prepared aqueous blocked polyurethane micelles (BPUMs) were uniform and spherical micro-particles. The particle size was decreased with increase of the DMPA content, while it was enlarged at first and then gradually decreased by increasing R -value. The stability of the micelles was affected by the R value, blocked efficiency and DMPA content. HDI-BPUMs were more stable than HDI-BPUMs at the same condition. The stability was further researched by the zeta potential combining with technique and viscosity tracking method, and the initial zeta potential be used as the stability criterion. In addition, a stabilization mechanism of the micelles was proposed. TCP-blocked TDI-BPUMs could be initially de-blocked at about 75°C and TCP-blocked HDI-BPUMs was de-blocked at about 80°C. The de-blocking temperature could be further reduced in the presence of catalyst, but it was scarcely affected by the change of R -value and DMPA content. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41908
研究领域:
高分子化学
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胶体与界面科学
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材料化学
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功能材料
·
纳米材料
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Jiantao Zhu,Zhimin Wu,Di Xiong,Langsheng Pan,Yuejin Liu
A novel linear and cross-linked network polyurethane dispersion (LWPUD and CWPUD) being blue transparent, low acid number and low crystallinity were prepared using the pre-polymerization and chain-extending reaction synthetic method. The properties of LWPUD and LWPUF(linear WPU film) with different 2,2-dimethylolpropionic acid (DMPA) contents were examined by fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM) and dynamic light scattering technique (DLS), X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and thermal gravimetric analyzer (TGA). The particle size of CWPUD, the water resistance and the mechanical property of cross-linked WPU film (CWPUF) with different TMP contents were investigated. The results showed that with increasing DMPA content in polyurethane chain, the particles of LWPUD became more uniform and regular, and the glass transition temperature of LWPUF decreased, while its thermal stability increased. With increasing the TMP content in polyurethane chain, the particle size of CWPUD and the water resistance and the tensile strength of CWPUF increased, while the elongation at break of CWPUF decreased. By adding water-based colorant, wetting agent, adhesion promoter and deionized water into LWPUD and CWPUD, a novel water-based ink with low crystallinity was obtained. The adhesion, water resistance and anti-adhesion of the cross-linked network water-based ink were better than those of the linear water-based ink in application on polyethylene terephthalate (PET) substrate.
研究领域:
聚合物科学
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Futao Sai,Haitao Zhang,Jianbo Qu,Jianyong Wang,Xiuzhong Zhu,Peng Ye,Zhiliang Zhang
Recently, the self-healing and recyclability of waterborne polyurethane (WPU) has attracted significant research attention. Herein, different weight ratios of Diels-Alder (DA) diol and diacetyl oxime (DMG) were used as the reactive monomer with polytetramethylene ether glycol (PTMG), isophorone diisocyanate (IPDI) and dimethylolpropionic acid (DMPA). A series of thermal-driven self-healing and green recyclable waterborne polyurethane films (WPU-DMG x -DA y ) were prepared based on synergistic dynamic reactions of oxime-carbamate and DA bonds. We investigated the properties of WPU-DMG x -DA y emulsions by particle size and zeta potential tests, and the results show that these emulsions have excellent storage stability. The self-healing properties of WPU-DMG x -DA y films were identified by dynamic mechanical analysis . It was revealed that the WPU-DMG 4 -DA 4 film has the best self-healing capability, and the self-healing efficiency can reach 92. ± 0.1 % after self-healing at 120 °C for 4 h. The mechanism of the self-healing behavior was studied by Fourier transform infrared spectroscopy , and the effective reversibility of the oxime-carbamate and DA bonds were verified. In addition, thermal gravimetric analysis and tensile test results showed that the thermal stability and mechanical properties of the WPU-DMG x -DA y films were significantly improved. More importantly, the WPU-DMG 4 -DA 4 film can be dissolved in a mixed acetone/ethanol solvent at room temperature. The recycled polyurethane solution could be dispersed in water to obtain a WPU emulsion again. After being recycled three times, the recovery efficiency of the mechanical properties of the WPU-DMG 4 -DA 4 film was higher than 90.1 ± 0.1 %, and the recycled film maintained its thermal stability and self-healing behavior. Moreover, the synthetic leather obtained by compounding WPU-DMG 4 -DA 4 and non-woven fabrics could be easily recycled through this process. The basic properties of the recycled non-woven fabric remained unchanged and the recycled WPU-DMG 4 -DA 4 resin could be reused. Therefore, the WPU-DMG 4 -DA 4 resin has broad application prospects in the tanning industry.
研究领域:
材料科学
·
聚合物化学
·
环境科学
·
可持续材料
✓ 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）