JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Yongzhao Zhang,Xia Guo,Jianbing Ji
(2R,3S,4S,5S)-6-(Hydroxymethyl)-tetrahydro-2H-pyran-2,3,4,5-tetraol (d-glucose) solubility in 1-dodecanol, 1-decanol, and 1-octanol from 343.15 K to 393.15 K was determined, respectively. The solubility of d-glucose increased with an increase in temperature and decreased with the increase of fatty alcohol chain length. The modified UNIQUAC model, S-UNIFAC model, and mS-UNIFAC model were applied to predict the solubility data; the interaction parameters were determined. Of the three models, the modified UNIQUAC model showed better prediction accuracy.
研究领域:
化学工程
·
生物化学
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DOI
高影响因子
Pigment & Resin Technology
·
2023
·Vol. 53
·期 5
·650-658
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IF 1.4
Fuping Bian,Shudong Lin
PurposeThis paper aims to investigate the effects on coatings performance in the epoxy silicone resin system owing to the existence of the different chain length of open-chain epoxy monomer. In this paper, [4-Methylphenyl-(4–(2-methylpropyl) phenyl)]iodonium as photoinitiator was added into epoxy silicone resin by ultraviolet (UV)-cured polymerization to investigate the effects on coatings performance owing to the existence of the different chain length of open-chain epoxy monomer.Design/methodology/approachA simple hydrosilylation reaction was used to synthesize epoxy-based silicone prepolymers by using hydrogen-terminated polydimethylsiloxane, 1,2-epoxy-5-hexene, 1,2-epoxy-7-octene and 1,2-epoxy-9-decene as precursors.FindingsThe results revealed that the glass transition temperatures (Tg) and hydrophobicity increased with the chain length of open-chain epoxy monomer in the UV curable epoxy-based silicone coatings, and these films had excellent heat resistance, hydrophobicity, antigraffiti and ink removal properties.Research limitations/implicationsThe cationic photocuring systems are not susceptible to the effect of oxygen inhibition. However, the limitation of cationic light curing process is that it requires a long curing time.Originality/valueThe coatings prepared via the UV curing approach can provide superior antismudge effects, and thus they are promising candidates for use in various industries, especially in fields such as antismudge coatings and antigraffiti coatings.
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
POLYMER ENGINEERING AND SCIENCE
·
2019
·Vol. 60
·期 3
·446-454
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IF 1.92
Kangming Xu,Hongdi Zhou,Qiaoman Hu,Junhui Wang,Yue Huang,Jinlei Chen
For hindered phenol (HP)/polymer-based hybrid damping materials, the unclear relationship between the structure of HP and the damping properties limits the application of such promising materials. Herein, three kinds of HPs with different chain lengths were synthesized to explore the mechanism. The structures of the HPs were confirmed by nuclear magnetic resonance spectrum, the Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray Diffraction (XRD). For further prepared HP/polyurethane hybrids, FT-IR and XRD were adopted to confirm the hydrogen bonding interactions and micromorphologies. Moreover, molecular dynamics simulation was used to characterize the effects of chain length variation on the inter- and intramolecular hydrogen bonds (HBs) and the chain packing of the hybrids in a quantitative manner. Subsequently, combined with the dynamic mechanical analysis, the relationship between the chain length variation and the damping properties was established. The results showed that with the increasing of chain length, the intramolecular HBs between HPs can be prevented, and the loose HP chain within tight polymer matrix can be achieved, which results in a maximum increase of loss factor. While the homogeneity of the chain packing increases with the chain length increasing, which results in a decrease of the temperature range of loss factor ≥ 0.3. POLYM. ENG. SCI., 60:446–454, 2020. © 2019 Society of Plastics Engineers
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMER
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2023
·
IF 4.6
Lunliang Chen,Lianwei Li,Jinxian Yang
For the first time, this work has explored the cyclization kinetics of multi -mers during step-growth polymerization by using alkyne-PS-azide ( l -PS-N 3 ) as model macromonomer, where PS represents polystyrene. First, three AB-type PS macromonomers with different chain lengths have been prepared by atom transfer radical polymerization (ATRP), namely, l -PS 77 -N 3 , l -PS 240 -N 3 and l -PS 380 -N 3 . Second, the polymerization and cyclization kinetics has been monitored in dimethylformamide (DMF), tetrahydrofuran (THF) and cyclopentane (CyP). Third, by size exclusion chromatography (SEC) and liquid chromatography at the critical condition (LCCC) methods, we have quantified how the macromonomer chain length, solvent type and reaction concentration affect the intra-chain cyclization process. The analysis results have demonstrated that, for macromonomer l -PS 77 -N 3 with shorter chain length, the reaction rate of macromonomer cyclization, multi -mer cyclization and inter-chain coupling, is significantly faster than that for l -PS 240 -N 3 and l -PS 380 -N 3 with longer chain lengths. The total percentage of final cyclic product ( wt cyclic ) slightly decreases with the increase of macromonomer chain length, namely, 33%, 25% and 23% for l -PS 77 -N 3 , l -PS 240 -N 3 and l -PS 380 -N 3 , respectively. At the same time, we found that, solvent with lower solvent viscosity and relatively poor solvent quality is more conducive to the cyclization reaction of PS chains. In addition, we also found that the inter-chain and intra-chain reaction rate are both faster than that at other reaction concentrations when the reaction concentration is near the critical overlapping concentration.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
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IF 4.1
Ding Wei,Jialuo Xiang,Qinlan Luo,Yu Mao,Xiao Luo,Yangqiang Huang,Zhiwu Liang
To study the reaction kinetic of CO 2 absorption in aqueous secondary amine + tertiary amine blends, 1-Diethylamino-2-propanol (DEA2P) and 1-Dimethylamino-2-propanol (DMA2P) were selected to form aqueous amine blended solutions with 2-(Ethylamino) ethanol (EAE), respectively. The reaction kinetics of CO 2 absorption in aqueous EAE/DEA2P solutions and EAE/DMA2P solutions were explored using the stopped-flow apparatus, and the reaction mechanism was then explored by Density Functional Theory (DFT) calculations. Based on the zwitterion mechanism and the base-catalyzed hydration mechanism, experimental reaction kinetics models were established. It was found that in secondary amine + tertiary amine blends, tertiary amines played the key role of the proton acceptor in step of zwitterion deprotonation. With the increase of the chain length of tertiary amine, the CO 2 absorption rate increased. Through analysis, it was found that the main reason for the increased CO 2 absorption rate was the presence of H-bond or the stronger proton affinity of N atom.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Soft Matter
·
2015
·Vol. 11
·期 45
·8848-8855
·
IF 4.029
Yanjuan Yang,Lifei Liu,Xin Huang,Xiuniang Tan,Tian Luo,Wei Li
Temperature-induced vesicle to micelle transition (VMT), which has rarely been reported in cationic/cationic mixed surfactant systems, was systemically studied in a didodecyldimethylammonium bromide (DDAB)/dodecyltrimethylammonium chloride (DTAC) aqueous solution. We investigated the effect of temperature on DDAB/DTAC aqueous solutions by means of turbidity, conductivity, cryo-TEM, a UV-vis spectrophotometer, and a steady-state fluorescence spectrometer. It was found that increasing temperature could induce the transformation from the vesicle to the micelle in this cationic/cationic mixed surfactant system. The degree of transformation can be easily controlled by the operation temperature. Additionally, by adjusting the proportion of the mixed cationic/cationic systems and employing cationic surfactants with different chain-lengths, we were able to conclude that the hydrophobic tail length of the surfactant affects the aggregation behavior of cationic/cationic mixed surfactant systems as a function of temperature. It is universal to induce the transformation from the vesicle to the micelle by temperature in cationic/cationic mixed surfactant systems. A possible mechanism for the temperature-induced VMT was proposed based on the experimental results.
研究领域:
化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 43
·e57676
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IF 2.8
Li Dang,Jia Liu,Xinyi Bao,Yongkui Zheng,Zhihui Lv
To enhance the interfacial compatibility and fire safety of polyvinyl chloride (PVC)/molybdenum trioxide-doped magnesium hydroxide (MO@MH) composites, three chain-length-varied silicon-phosphorus polyether modifiers (ABP 200 , ABP 1000 , and ABP 2000 ) were synthesized and characterized. Magnesium-molybdenum-silicon-phosphorus multicomponent flame retardants (MO@MHABP) were subsequently prepared via wet modification. The chain-length-dependent mechanical behavior of PVC composites was systematically evaluated through combined experimental characterization and molecular dynamics (MD) simulations. Static mechanical tests revealed that yield strength, tensile strength, and impact strength of PVC/MO@MH composite were all improved by inducing ABP modifiers, with the shortest-chain ABP 200 showing optimal enhancement. Dynamic mechanical analysis revealed increased storage/loss modulus and glass transition temperatures for PVC/MO@MHABP, indicating restricted chain mobility. Interface interaction models (Turcsányi equation and Kubát model) combined with MD simulations demonstrated that the shortest-chain modifier (ABP 200 ) enhanced interfacial adhesion through the strongest Cl–NH interactions (supported by the most negative Δ E values). Cone calorimetry tests indicated that ABP modification decreased the heat release rate and total heat release of PVC/MO@MH composites but did not significantly improve smoke suppression. This study provides valuable insights into interfacial regulation and performance optimization in PVC composites.
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DOI
高影响因子
危险品化学品经营许可证（带存储）