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Mechanical properties of epoxy adhesives with nanoSiO2modified by different active groups(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年1期
Page:
30-38
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Mechanical properties of epoxy adhesives with nanoSiO2modified by different active groups
Author(s):
LI Chuanxi1; 2;  LONG Jiejie1; 2;  LI You1;  GAO Youwei
(1. Key Laboratory of Green Construction and Maintenance of Bridges and Buildings of Hunan Province，Changsha University of Science & Technology， Changsha 410114， Hunan, China； 2. Key Laboratory ofSafety Control for Bridge Engineering of the Ministry of Education, Changsha University ofScience & Technology， Changsha 410114， Hunan, China)
Keywords:
bridge engineering;  mechanical property;  active group nanoSiO2;  epoxy adhesive;  tensile section
PACS:
-
DOI:
-
Abstract:
In order to explore the effect of active groups on the mechanical properties of nanoSiO2 particles modified epoxy adhesives and prepare a excellent performance of epoxy resin structural adhesives, the epoxy resin mixed with amino modified nanoSiO2 particles (SiO2—NH2) adhesives, methacrylic modified nanoSiO2 particles (SiO2—C4H8) adhesives and inactive group modified nanoSiO2 particles (SiO2—0) adhesives were studied. The nanoparticles includes six types, 0%, 0.01%, 0.02%, 0.05%, 0.1%, 0.2% and 0.5% (mass fraction, the same below), which were dispersed by an ultrasonic cell crusher to prepare six kinds of dosage and sixteen types of modification of nanoSiO2 particleenhanced epoxy adhesives, the tensile and bending properties of the structural adhesive were tested. The dispersion of nanoparticles in the epoxy were observed by scanning electron microscope (SEM), several main failure modes of the specimen were shown, and the strengthening and toughening mechanism were revealed by the morphology of the crosssection after incorporating nanoparticles. The results show that nanoparticles are beneficial to improve the axial tensile performance when the dosage of nanoSiO2 particles is from 0% to 0.05%, then decreases as the content of nanoSiO2 particles increases. The tensile strength of SiO2—NH2, SiO2—C4H8 and SiO2—0 is respective increased by 47.60%, 47.63% and 36.12% compared with pure adhesive when the mass fraction of nanoSiO2 particles is 0.05%, and the bending strength is increased by 48.52%, 62.20% and 34.92% compared with pure adhesive when the mass fraction of nanoSiO2 particles is 0.05%, 0.05% and 0.1%. The SEM analysis of the tensile section shows that the nanoSiO2 particles with a mass fraction of 0.05% have good dispersibility in the composite material, the addition of nanoSiO2 particles can change the roughness of the crosssection and the matrix near the nanoparticles produces obvious plastic deformation, which makes the fracture form of the tensile specimen change from brittle fracture to ductile fracture and improves the strength and toughness of the adhesive. The addition of too many nanoSiO2 particles cause agglomeration in the resin, resulting in a sharp drop in the mechanical properties of the colloid. 9 figs, 27 refs.

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Last Update: 2021-01-25