MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Huimin Duan,Shuli Li,Jinbiao Zhao,Hao Yang,Heyang Tang,Dongming Qi,Zhichao Huang,Xinxin Xu,Lei Shi,Peter Müller-Buschbaum,Qi Zhong
Due to the advantages of low energy consumption, no air and water pollutions, the reactive polyurethane films (RPUFs) are replacing the solvated and waterborne PUFs nowadays, which significantly promotes the green and low-carbon production of PU films. However, the microstructure evolution and in situ film-formation mechanism of RPUFs in solvent-free media are still unclear. Herein, according to time-temperature equivalence principle, the in situ polyaddition and film-formation processes of RPUFs generated by the typical polyaddition of diisocyanate terminated prepolymer (component B) and polyether glycol (component A) are thoroughly investigated at 25 °C. According to the temporal change of viscosity, the RPUFs gradually transfer from liquid to gel and finally to solid state. Further characterizing the molecular weight, hydrogen bonds, crystallinity, gel content, and phase images, the polyaddition and film-formation processes can be divided into three stages as 1) chain extension and microcrystallization; 2) gelation and demicrocrystallization; 3) microphase separation and film-formation. This work promotes the understanding of the microstructure evolution and film-formation mechanism of RPUFs, which can be used as the theoretical guidance for the controllable preparation of high-performance products based on RPUFs.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 14
·1909
·
IF 4.9
Andrey Galukhin,Roman Aleshin,Alexander Gerasimov,Alexander Klimovitskii,Roman Nosov,Liana Zubaidullina,Sergey Vyazovkin
Non-isothermal calorimetry is performed to study the kinetics of metal-free A2/B2-type azide–alkyne polyaddition between the dipropargyl ether of bisphenol A with different organic diazides. The diazide structure is varied to probe the effect of the nature of a hydrocarbon spacer between the azide groups on their reactivity. Isoconversional analysis demonstrates that the polymerization processes are characterized by the same activation energy of 84 kJ mol−1for all studied diazides. It is found that diazides with aromatic spacers demonstrate ~1.6 times higher reactivity than that of diazides with the alkyl spacer. The difference in the reactivity is explained by the difference in the electronic effects of the hydrocarbon spacers on the azide groups as well as by the difference in their steric availability. The veracity of the obtained kinetic parameters is validated by a polymerization test at the time–temperature conditions predicted from the obtained kinetic data followed by independent assessment of the monomer conversion using FTIR.
研究领域:
高分子化学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·6881-6889
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IF 12.732
Guang Yang,Yaduo Song,Longjiang Deng
The exploration for solid electrolytes to replace conventional organic liquid electrolytes paves the way for producing next generation lithium secondary batteries. Herein, a new class of polymer/inorganic hybrid electrolytes (HEs) were prepared through polyaddition reactions and these electrolytes effectively integrated polyether, ionic liquids (ILs), silsesquioxane cages, and supramolecular interactable units. Besides their excellent thermal stability (up to 275 °C) and low glass transition temperature (−45.5 °C), they were able to self-heal their incision quickly (within 100 min) at ambient temperature. They also exhibited high ionic conductivity (0.34 × 10−4 S cm−1 at 25 °C) among plasticizer-free solid polymer-based electrolytes and their ion transport properties could be conveniently tuned by adjusting the composition. Meanwhile, they revealed excellent long-term (>800 h) electrochemical compatibilities with lithium electrodes in galvanostatic cycling tests. The coin cell lithium solid batteries assembled with this class of HEs showed good performance. This work provides a novel hybrid electrolyte system towards the development of smart solid electrolytes for next generation lithium batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2014
·
IF 0.74
Yunyan Xue,Dandan Ma,Tianzhu Zhang,Siyan Lin,Shengnan Shao,Ning Gu
In this study, a series of comb-like methoxy polyethylene glycol (MPEG) functionalized polyurethanes (PUs) (PU–g–MPEG) were successfully prepared via ‘click’ chemistry and polyaddition reaction. The copper catalyzed Huisgen 1,3-dipolar cycloaddition was firstly carried out between 3,5-bis(hydroxymethyl)-1-propargyloxybenzene (PBM) and methoxy polyethylene glycol azide (MPEG–N3) to obtain MPEGylated diol PBM (MPEG–PBM). Then, the comb-like PUs having MPEG located on the backbones (PU–g–MPEG) were synthesized through the polyaddition of MPEGylated diol PBM and hexamethylene diisocyanate (HDI). Fourier transform infrared (FTIR), 1H NMR spectroscopy, size exclusion chromatography (SEC), and thermo gravimetric analyses (TGA) were used to characterize these synthesized MPEG-functionalized comb-like PUs (PU–g–MPEG). Compared with PU without MPEG grafts, PU–g–MPEG show a better wettability.
研究领域:
高分子化学
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材料科学
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有机合成
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表面化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 69
·40455-40461
·
IF 3.049
Caicai Jiao,Lilong Gao,Bing Yu,Hailin Cong,Youqing Shen
The Michael addition and alkylation reaction of active methylene compounds (AMCs) with two active hydrogens had been investigated extensively in organic chemistry, while the polymerization of AMCs had few studies. Herein, we reported active methylene-based polyaddition and polyalkylation catalyzed via an organic superbase under ambient conditions. A model polymerization was first conducted between ethylene glycol diacrylate (EGDA) and methyl cyanoacetate (MCA). The molecular weight (Mw) of the model polymer was up to 50 500 g mol−1 with a high yield (99%). Eight AMCs were selected and a high-throughput parallel synthesizing instrument (HTPSI) was used to synthesize semi-library polymers of AMCs and EGDA via a Michael type polyaddition. The obtained AMC-based polymers had low cell cytotoxicity. Elastomers with cyanogen groups could be prepared using trimethylolpropane triacrylate (TMPTA) as a crosslinker. Furthermore, three dihalogen compounds were explored to polymerize with MCA and malononitrile via alkylation reactions. The pendent cyanogen or ester groups of the polymers could be reduced by lithium aluminum hydride. Novel polymer families were constructed based on the polyaddition and polyalkylation of AMCs.
研究领域:
有机化学
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高分子科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）