JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 45
·e53106
·
IF 3.057
Sai Wu,Lulu Liang,Furong Chen,Zheng Yang,Yu Zheng,Yitian Wu,Lanze Li,Gaobo Lou,Juntao Dai,Yajun Pang,Hao Chen,Qun Fang,Zhehong Shen
The utilization of bamboo resources can significantly alleviate the wood shortage and facilitate CO 2 neutralization. However, the adhesive bonding performance of bamboo is not ideal, which greatly limits its application. Therefore, the biggest challenge is to explore a simple and effective method to enhance the bonding between bamboo and adhesive. In this study, we synthesized three butyl acrylate-styrene (BS) emulsions with different monomer ratios and incorporated them into urea-formaldehyde (UF) resins to prepare butyl acrylate-styrene modified urea-formaldehyde (BUF) adhesives. Results show that BS emulsion not only prolongs the workability time of UF adhesives (95 s–108 s), but also reduces the free formaldehyde content (0.38%–0.26%). Specifically, BS emulsion with the highest hard/soft monomer ratio makes BUF adhesive the lowest activation energy, showing the accelerated curing reaction. Specifically, the prepared laminated bamboo-veneer lumber (LBVL) exhibits the best wet-bonding strength and meets the Chinese National Standard, suggesting that BS emulsion with a higher hard/soft monomer ratio can enhance bonding performance. Thus, this efficient method can not only enhance various adhesive properties, but also improves the bonding performance on LVBL, which can greatly ease the shortage of wood resources and speed up the development of the bamboo industry.
研究领域:
林业科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Wenbo Liao,Shaona Zheng,Xiangxuan Huang,Lili Zhao,Lingyun Ye,Yunbing He,Shimin Kang
In this work, fluorine containing poly (styrene-acrylate) / ferrocene (FPSA / Fc) composites were prepared by directly mixing FPSA latexes with ferrocene and ethanol co-solvent. Vesicles were obtained while occurring oxidation of composite films, and ruptured to form micropores when carrying out heated process of oxidized films, resulting in increasing roughness and hydrophobicity of composite films. TEM images confirmed that two kinds of structures including ferrocene aggregates and adsorbate latexes existed in composite latexes. The average particle size was decreased after addition of ferrocene. SEM and AFM photos indicated that vesicles and micropores were observed on the oxidized and heated composite films, respectively, and the improvement of surface roughness was subsequently occurred. Water contact angle (WCA) results described that the oxidation had increased the hydrophilicity of composite films, in contrast, the rupture of vesicles had increased the hydrophobicity. The maximum WCA of composite film is up to 121° when the dosage of dodecafluoroheptyl methacrylate (DFMA) and ferrocene were 10.0 and 0.5 wt%, respectively. TGA curves demonstrated that the thermal stability was improved because of the addition of ferrocene and oxidation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Jin Huang,Jiajun Ma,Junxiao Yang
Due to its excellent weather resistance, acrylonitrile-styrene-acrylate (ASA) resin is widely utilized. However, one critical challenge is its unsatisfactory impact property, which restricts its further application. Although various studies have been reported on improving the toughening effect of ASA resin, most of them reduce its strength and modulus. It is difficult to strike a balance between the improved toughening effect and the reduced strength and modulus. Herein, we designed a silicone rubber filled acrylate core to synthesize an acrylonitrile-styrene–acrylate@ silicone (Si-ASA) three-layer core-shell nanostructure copolymer via three-step emulsion polymerization. Introducing ductile silicone rubber into the interior of acrylate rubber microparticles can increase and refine the cavitation of the rubber layer upon impact. Meanwhile, the fibrillation of silicone cores can absorb impact energy and bridge cracks. SEM images demonstrated the formation of the three-layer nanostructure of Si-ASA. The mechanical property results showed that the prepared Si-ASA exhibits a significantly increased impact strength of approximately 19.5KJ/m 2 , which is nearly twice that of the commercial ASA. Considering the much higher impact property of Si-ASA, this slightly higher of modulus is significant. These indicate that the Si-ASA three-layer core-shell nanostructure copolymer, when applied to ASA resin helps in achieving rigid-tough balanced materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Yumin Wu,Yupin Wang,Xiaoxiao Wan,Chuanhui Gao,Yuetao Liu
In this work, styrene-acrylate (SA) coatings were strengthened with renewable natural polymers (carboxymethyl chitosan, CMCS) and crosslinked by multiple hydrogen bonds , which improved the mechanical performance and endowed the self-healing properties. SA latex was synthesized by styrene (St), butyl acrylate (BA), glycidyl methacrylate (GMA) and acrylamide (AM) with semi continuous seed emulsion polymerization . SA coatings were obtained after drying the mixture of SA latex and CMCS. The rigid skeleton of CMCS and hydrogen bonds cross-linked network improved the mechanical properties of SA coatings. The stress and strain improved from 12.3 to 17.9 MPa and 1765% to 2148%. The reversible hydrogen bonding interactions between SA and CMCS made the films had a self-healing efficiency of 68.7%. Moreover, the hardness of SA coatings reached 80.6. Combined with the spraying technique, SA conductive coatings were prepared by spraying carbon nanotubes aqueous dispersions (CNTs) on the surface. The conductivity and sensing ability of the SA conductive coatings were examined by an electrochemical workstation. The results demonstrated that SA conductive coatings had the signal sensing ability for tiny movements, which was of potential applications in the field of sensors.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2021
·
IF 2.389
Yuanying Zhang,Xuechun Zhang,Yongbin Cao,Jiachun Feng,Wuli Yang
Herein, acrylonitrile-styrene-acrylate copolymer (ASA) particles with different microstructure were synthesized by emulsion polymerization and then used for toughening poly(styrene-co-acrylonitrile) (SAN) resin. The structure of ASA particles was confirmed by FTIR. TEM results demonstrated that the particles with different morphologies of multilobe shape, complete core-shell and dumbbell shape were obtained depending on the cross-linker amount. It was found that the toughening efficiency reached the highest when the ASA particles had complete core-shell structure and the shell composition was close to that of the SAN matrix. It was ascribed to the fact that the complete shell layer and similar shell composition provided sufficient interfacial adhesion and transferred stress to induce larger matrix deformation, so that the notched impact strength increased accordingly. Moreover, the notched impact strength of SAN/ASA blend was improved without significantly sacrificing tensile strength when adding 30 wt% ASA particles with the size of around 400 nm. SEM results of the impact-fractured surfaces revealed that irregular fluctuation and numerous microvoids occurred. It was deduced that the toughening mechanism was attributed to the crazings and cavitation of particles. Therefore, this study paved a way of toughening the resin by adjusting the microstructure of the particles including morphology, composition, and size.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Pigment & Resin Technology
·
2022
·Vol. 53
·期 1
·114-121
·
IF 1.126
Jianqing Hu,Hongjun He,Feiliang Dai,Xingyu Gong,Haowei Huang
PurposeThe purpose of this paper is to develop the efficiency of styrene-acrylate (SA) emulsions for polymer cement waterproof coatings with improved bacteria resistance and mechanical properties.Design/methodology/approachFor effective bacteria resistance and excellent mechanical properties, various concentrations of methacryloxyethylhexadecyl dimethylammonium bromide (MHDB) were synthesised and incorporated into SA emulsions. The properties of SA emulsions modified with MHDB were characterised and compared with those of unmodified ones according to the formulations of polymer cement waterproof coatings.FindingsThe SA emulsions modified with MHDB exhibited significant enhancement of bacteria resistance and mechanical properties over the unmodified ones. The positive quaternary nitrogen and long-chain alkyl groups of MHDB in SA emulsions could attract phospholipid head groups of bacterial and insert them into the cell wall, which results in biomass leak and bactericidal effect. Moreover, MHDB as a softened monomer was beneficial to the synthesis of SA copolymer with low glass-transition temperature (Tg), then the copolymer and cement would form a more compact film which was the main reason for the enhancement of mechanical properties.Research limitations/implicationsThe modifier MHDB was synthesised from diethylaminoethyl methacrylate (DEAM) and 1-bromohexadecane. Besides, the congeners of MHDB could be synthesised from DEAM and 1-bromododecane, 1-tetradecyl dromide, 1-octadecyl bromide, etc. In addition, the efficiency of other modifications into SA emulsions for antibacterial polymer cement waterproof coatings could be studied as well.Practical implicationsThe method provided a practical solution for the improvement of water-based antibacterial acrylate polymer cement waterproof coatings.Originality/valueThe method for enhancing bacteria resistance and mechanical properties of the waterproof coating was novel and valuable.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2023
·
IF 3.9
Wenbo Liao,Xiangxuan Huang,Guoyu Zhong,Lingyun Ye,Shaona Zheng
Graphene oxide (GO) nanosheets decorated with silver nanoparticles (AgNPs) were easily synthesized by chemical reduction, and the prepared nanocomposite was then used as a stabilizer in the Pickering emulsion polymerization of poly (styrene-acrylate) to prepare PSA/AgNPs-GO composites. The AgNPs-GO nanocomposites were fully characterized by TEM, FTIR, Raman, SEM and XPS , which demonstrated that about 5–30 nm AgNPs with spherical, octahedral and cubic structures were decorated on the surface of wrinkled GO nanosheets . TEM photos and EDS spectrum of composites showed that the transparent GO nanosheets decorated with AgNPs were covered on the surface of PSA latexes and the AgNPs were uniformly dispersed on the surface of the PSA latexes without aggregation. The average diameter of composite latexes was obviously bigger than that of PSA latexes. However, the role of surfactant and the properties of hydrophilicity decreased the average diameter and WCA of composites while increasing the additions of AgNPs-GO nanocomposites. AFM images disclosed that wrinkled GO nanosheets decorated with AgNPs dispersed on the surface of composite films . XPS data proved clearly that silver was present only in metallic form and migration occurred during film-formation. TGA curves confirmed the composite film displayed better thermal stability than that of PSA. The results of antibacterial activity revealed that composite films had exhibited antibacterial properties against both E. coli and S . aureus , and the latter showed better antibacterial efficacy than the former. The nano-silver polyacrylate coatings with antibacterial activity explored in current work have wide application in the fields of wood coatings, leather finishing, and so on.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
高分子科学
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Cong Wu,Dongshuai Hou,Bing Yin,Binmeng Chen,Zongjin Li
The polystyrene acrylate (PSA) coating and polysiloxane coatings can protect the durability of cementitious materials through surface barrier and internal hydrophobicity, respectively. However, their composite coating presents a challenge due to the significant difference in molecular structure, molecular polarity, and thermodynamic properties, leading to poor interfacial compatibility. This paper presents a novel multi-component interpenetrating polymer network (IPN) based on the ‘host - guest molecular structure’ theory, which consists of cross-linked PSA as the main molecule and polysiloxane as the guest molecule, interfacially regulated by functionalized nanoparticles. The IPN composite coatings with high microphase separation properties enable dual synergistic protection of the durability of cementitious materials. The IPN emulsions synthesized increased the proportion of harmless pores within the cementitious materials to over 88.3 %. Additionally, they decreased the static capillary water absorption of concrete by over 94.06 % and effectively inhibited the formation of corrosion products, including Friedel's salt, gypsum, ettringite, and CaCO 3 . The adhesion strength of the IPN coating was also improved to 2.7 MPa, and its thermal expansion coefficient was limited to within 5.5 × 10 −5 /K. Moreover, the modified IPN coating contains numerous strong hydrogen bonds and interwoven molecular networks. These features enable stable deformation recovery and surface shielding of cracked concrete.
研究领域:
材料科学
·
高分子化学
·
土木工程
·
涂料与表面处理
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Cong Wu,Bing Yin,Dongshuai Hou,Shaochun Li,Xinpeng Wang
Core-shell polymer coating is a significant means of improving the surface protection of cement-based materials. In this paper, a novel strategy for the paraffin-doped polystyrene acrylate-polysiloxane core-shell emulsions (CSP) are proposed by combining polyaddition and polycondensation reactions , integrating the superior corrosion-resistance of PSA emulsions with the high-hydrophobicity of siloxane emulsions. The CSP emulsions have excellent physical stability and rheological behavior , with a lower proportion of unsaturated bonds and lower content of chemically bound water. The core-shell structure promotes the formation of Si–O bonds between the polymer molecules and the cement matrix , and more conducive to the formation of new silicate crystals on the cement hydrate surface. Macroscopically, the surface energy of the cement samples treated with CSP coating is below 16.7 mJ/m 2 , while its superficial nanoscale papillae give a water contact angle of almost 140°. The capillary absorption coefficient of the Portland concrete treated with CSP coating can be decreased to only 2.09 g/(m 2 ·h 0.5 ). Meanwhile, the corrosion rate of Cl − and SO 4 2− on the cementitious materials are significantly inhibited by the CSP membrane, reducing the levels of Friedel's salt, ettringite and gypsum generated by ionic corrosion, respectively. Furthermore, the CSP membranes have excellent molecular structural integrity and high cross-linkage under acid/alkaline corrosion and photo-thermal aging, maintaining superior adhesion and corrosion resistance with the cement substrate.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Cong Wu,Mengmeng Li,Dongshuai Hou,Bing Yin,Binmeng Chen,Zongjin Li
Cementitious materials in durability can be improved by membrane protection and osmotic hydrophobicity with Polystyrene acrylate (PSA) and polysiloxane (PSE), respectively. However, due to the significant differences in molecular structure, the fabrication of PSA- PSE composite coatings with multiple protective effects have been a thorny issue. In order to enhance the interfacial binding effect between PSA and PSE, and to solve the problem of poor stability caused by poor compatibility, this paper innovatively utilizes the topological network structure growth regulation mechanism of secondary surface functional nanoparticles to prepare PSA-PSE copolymer emulsions with highly crosslinked star and dendrimer structures, respectively, with branch grafting ratios of over 94% and semi-crystallinity of over 5.39%. As a consequence of surface treatment, numerous dense calcium-silicate crystals with low Ca/Si ratios are deposited inside the cementitious materials, decreasing the volume proportion of harmful micropores and connected capillary pores to below 10.4%. The modified copolymer coatings decrease the capillary water absorption and static permeability of concrete by over 55%, and lead to nearly 80% reduction in carbonation depth of cement hydrates, and have an adhesion strength of up to 3.3 MPa. Particularly, the proportion of ordered hydrogen bond within the composite coating reached 45.1%, demonstrating excellent reversible elastic deformation recovery performance.
研究领域:
材料科学
·
土木工程
·
高分子化学
✓ 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）