{"title":"The effect of modified silica nanoparticles on the mechanical properties of UV-curable polyurethane acrylate adhesive","authors":"Farina Moghaddam, Abolfazl Tutunchi","doi":"10.1016/j.ijadhadh.2024.103899","DOIUrl":null,"url":null,"abstract":"<div><div>In this research, the effect of SiO<sub>2</sub> nanoparticles on the one-component urethane acrylate (UA) based ultraviolet (UV) curing adhesive bonds was studied. UV adhesives attracted attention due to their advantages such as fast curing, being colorless, and thin adhesive layer at the joint. However, one of the drawbacks associated with UV adhesives is their suboptimal mechanical properties. The aim of this work is to fabricate and characterize a nanocomposite adhesive by incorporating silica nanoparticles into the urethane acrylate adhesive. At first, fumed silica nanoparticles were modified by γ-Methacryloxypropyltrimethoxysilane (MPS) and γ-Aminopropyltriethoxysilane (APTES)@methyl acrylate (MA) via sol-gel process and Michael addition reaction then introduced to the urethane acrylate adhesive. A notable betterment was observed within the shear strength of adhesive joints. The morphological and structural characteristics of silica/UA, functionalized silica-MPS/UA, and functionalized silica-APTES@MA/UA nanocomposite adhesives were assessed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The successful dispersion of functionalized silica nanoparticles into the UA adhesive led to the foundation of hardy interfacial adhesion with UA by easing the formation of cross-linking networks between the nanoparticles and UA after UV polymerization that was proved in results. In addition, SEM micrographs show a transition of fracture morphology from smooth to rough surfaces upon the addition of nanoparticles. In addition, an increase in nanoparticle concentration caused a reduction in the contact angle. The shear strength of the 1.5 wt% pristine silica/UA, 1.5 wt% functionalized silica-MPS/UA, and 1 wt% functionalized silica-APTES@MA/UA adhesive composite were 59.37 %, 84.63 %, and 46.51 % increased respectively, as compared to neat UA adhesive.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"137 ","pages":"Article 103899"},"PeriodicalIF":3.2000,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Adhesion and Adhesives","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0143749624002811","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
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Abstract
In this research, the effect of SiO2 nanoparticles on the one-component urethane acrylate (UA) based ultraviolet (UV) curing adhesive bonds was studied. UV adhesives attracted attention due to their advantages such as fast curing, being colorless, and thin adhesive layer at the joint. However, one of the drawbacks associated with UV adhesives is their suboptimal mechanical properties. The aim of this work is to fabricate and characterize a nanocomposite adhesive by incorporating silica nanoparticles into the urethane acrylate adhesive. At first, fumed silica nanoparticles were modified by γ-Methacryloxypropyltrimethoxysilane (MPS) and γ-Aminopropyltriethoxysilane (APTES)@methyl acrylate (MA) via sol-gel process and Michael addition reaction then introduced to the urethane acrylate adhesive. A notable betterment was observed within the shear strength of adhesive joints. The morphological and structural characteristics of silica/UA, functionalized silica-MPS/UA, and functionalized silica-APTES@MA/UA nanocomposite adhesives were assessed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The successful dispersion of functionalized silica nanoparticles into the UA adhesive led to the foundation of hardy interfacial adhesion with UA by easing the formation of cross-linking networks between the nanoparticles and UA after UV polymerization that was proved in results. In addition, SEM micrographs show a transition of fracture morphology from smooth to rough surfaces upon the addition of nanoparticles. In addition, an increase in nanoparticle concentration caused a reduction in the contact angle. The shear strength of the 1.5 wt% pristine silica/UA, 1.5 wt% functionalized silica-MPS/UA, and 1 wt% functionalized silica-APTES@MA/UA adhesive composite were 59.37 %, 84.63 %, and 46.51 % increased respectively, as compared to neat UA adhesive.
在这项研究中，研究了二氧化硅纳米粒子对基于单组分聚氨酯丙烯酸酯（UA）的紫外线（UV）固化粘合剂粘接的影响。紫外线粘合剂因其固化速度快、无色、接合处粘合层薄等优点而备受关注。然而，紫外线粘合剂的缺点之一是机械性能不理想。这项工作的目的是在聚氨酯丙烯酸酯粘合剂中加入纳米二氧化硅颗粒，从而制造出一种纳米复合粘合剂并对其进行表征。首先，通过溶胶-凝胶工艺和迈克尔加成反应，将气相二氧化硅纳米粒子用γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）和γ-氨基丙基三乙氧基硅烷（APTES）@丙烯酸甲酯（MA）改性，然后引入到丙烯酸聚氨酯胶粘剂中。粘合剂接头的剪切强度明显提高。通过 X 射线衍射（XRD）、傅立叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）评估了二氧化硅/UA、功能化二氧化硅-MPS/UA 和功能化二氧化硅-APTES@MA/UA 纳米复合粘合剂的形态和结构特征。结果表明，官能化二氧化硅纳米颗粒成功地分散到 UA 粘合剂中，在紫外聚合后，纳米颗粒与 UA 之间形成的交联网络为纳米颗粒与 UA 的牢固界面粘合奠定了基础。此外，扫描电镜显微照片显示，添加纳米粒子后，断裂形态从光滑表面转变为粗糙表面。此外，纳米粒子浓度的增加导致接触角减小。与纯 UA 粘合剂相比，1.5 wt% 原始二氧化硅/UA、1.5 wt% 功能化二氧化硅-MPS/UA 和 1 wt% 功能化二氧化硅-APTES@MA/UA 粘合剂复合材料的剪切强度分别提高了 59.37%、84.63% 和 46.51%。
期刊介绍：
The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.
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