POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Binzhi Wang,Yuewen Huang,Bin Wang,Ruixiang Zhou,Feng Wang,Hui Liu
In this study, an N, N-dimethyl-p-toluidine/benzoyl peroxide redox initiation system was used to synthesize a series of silicone-modified UV-curable acrylic pressure-sensitive adhesives (PSAs) via bulk polymerization. The oxidizing and reducing agents were added separately but simultaneously into a mixture of monomers. The impact of varying monomer content on the PSA's properties, as well as the influence of organosilicon incorporation on water and aging resistance, was evaluated through 180° peel strength and initial adhesion tests. The results demonstrated that the PSA without organosilicon modification exhibited a maximum peel strength of 7.21 N/25 mm and an initial adhesion of 8.41 N/25 mm. Although the introduction of the organosilicon structure reduced both peel strength and initial adhesion, it notably improved the PSA's water resistance and aging resistance. Highlights Synthesis without solvent using redox initiator system. UV-cured system to enhance molecular weight and adhesion. Introduction of silane structure to improve water and aging resistance. Adhesion performance testing on different substrates (PET and BOPP).
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
Polymers
·
2022
·Vol. 14
·期 8
·1540
·
IF 4.967
Feiyue Wang,Hui Liu,Long Yan
Polypyrrole-decorated tungsten tailing particles (PPY-TTF) were prepared via the in situ polymerization of pyrrole in the presence of tungsten tailing particles (TTF), and then carefully characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG) analyses. The effect of PPY-TTF on the flame retardancy, smoke suppression property and ageing resistance of intumescent fire-resistant coatings was investigated by a fire protection test, smoke density test and cone calorimeter test. The results show that PPY-TTF exerts excellent cooperative effect on enhancing the flame retardancy and smoke suppression properties of the intumescent fire-retardant coatings, which is ascribed to the formation of more cross-linking structures in the condense phase that enhance the compactness and thermal stability of intumescent char. The cooperative effect of PPY-TTF in the coatings depends on its content, and the coating containing 3 wt% PPY-TTF exhibits the best cooperative effect among the samples, showing a 10.7% reduction in mass loss and 35.4% reduction in flame-spread rating compared to that with 3% TTF. The accelerated ageing test shows that the presence of PPY-TTF greatly slows down the blistering and powdering phenomenon of the coatings, thus endowing the coating with the super durability of fire resistance and smoke suppression property. This work provides a new strategy for the resource utilization of tungsten tailing in the field of flame-retardant materials.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Xiaoqiang Zheng,Ying Tang,Yongping Bai
Novel photosensitive fluorinated polysiloxane (MA-PNFMS) overhanging with nonafluorohexyl and capped with methacrylate groups were synthesized. The UV-curable coatings were prepared using sulfhydryl functionalized fluorosilicone resin (SFSR) as an additive. The surface chemical composition and morphology, optical properties, adhesion, contact angles and surface energy, liquid repellency, and aging resistance were studied. Results show that the surface energy is as low as 19.0 mN/m, showing excellent liquid repellency. Liquids of varying surface tensions can slide down the inclined surface under gravity without any residue. The adhesion of the coating can reach 4B grade, the transmittance can reach 100%, and the haze is less than 0.6%. Furthermore, the coating also demonstrates excellent aging resistance, and its optical transparency and liquid repellency are maintained after UV and thermal aging. This study shows that MA-PNFMS could be applied as promising protective coatings.
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
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 2
·282-289
·
IF 1.595
Zhonghua Yang,Jinjie Zhang,Yingping Qi,Yongfeng Shen,Hua Li
Paper cultural relics are important historical and cultural heritage. However, they are easy to be damaged with time. In order to improve the mechanical strength, water resistance and delay aging of paper, hydrophobically modified hydroxyethyl cellulose-methyl methacrylate copolymer emulsion for paper protection was synthesized, with hydroxyethyl cellulose as the matrix, methyl methacrylate, butyl acrylate glycidyl methacrylate, and dodecyl methacrylate as the graft polymers. The prepared emulsion was applied to paper protection. By testing the effects of emulsion with different mass concentrations on the tensile strength, folding endurance, tear strength, whiteness and gloss of paper, the suitable conditions for the application of paper protection were found. The results showed that the mechanical properties of the paper coated with 10 % emulsion were significantly improved, and the gloss and whiteness were basically unchanged. The appearance of the paper did not change obviously, which was in line with the principle of “repair as old, keep the original”. At the same time, the aging resistance and water resistance experiments show that paper coated with the new material has certain aging resistance and water resistance. Therefore, the prepared hydroxyethyl cellulose-methyl methacrylate copolymer emulsion has great application prospects in the protection of paper.
研究领域:
材料科学
·
文物保护
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Xingyu Mou,Yiqin Guo,Xuejun Lai,Jianping Ding,Hongqiang Li,Xingrong Zeng
Chemically crosslinked polyurethane materials with excellent mechanical properties have attracted considerable attention, yet recyclability is still challenging. Herein, a self-healing and reprocessable polyurethane (PU) elastomer with triple dynamic networks was synthesized through the addition reactions of methylenediphenyldiisocyanate with polyetheramine, protocatechualdehyde, and tris(2-aminoethyl) amine, as well as the incorporation of Fe 3+ ions. Owing to the formation of microphase-separated structure and triple dynamic networks including hydrogen bonds, Fe 3+ -catechol coordination, and imine bonds, the obtained PU elastomer exhibited excellent mechanical properties with a tensile strength of 6.40 MPa, elongation at break of 1838%, toughness of 51.16 MJ m − 3 and fracture energy of 154.91 kJ m − 2 . Importantly, the PU elastomer possessed not only high healing efficiency of 96.6% after healing at 60°C for 24 h, but also superior reprocessability with a tensile strength retention rate of 75.6% after three reprocessing cycles. Besides, owing to residual phenolic hydroxyl groups in unreacted PA, the PU elastomer also exhibited outstanding thermal-oxidative aging resistance. The findings in this work conceivably stand out as a new methodology for the preparation of functional and high-performance elastomers.
研究领域:
材料科学
·
高分子化学
·
机械工程
·
纳米技术
·
化学工程
✓ 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）