The Influence of Epoxy Functionalized Silica Nanoparticles on Stress Dispersion and Crack Resistance in Epoxy-Based Hybrids

被引:19
作者
Afzal, Adeel [1 ,2 ]
Siddiqi, Humaira Masood [1 ]
Saeed, Shaukat [3 ]
Ahmad, Zahoor [4 ]
机构
[1] Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan
[2] Univ Bari Aldo Moro, Dipartimento Chim, I-70126 Bari, Italy
[3] Pakistan Inst Engn & Appl Sci, Dept Met & Mat Engn, Islamabad 45650, Pakistan
[4] Kuwait Univ, Fac Sci, Dept Chem, Safat 13060, Kuwait
关键词
AFM; Functional Silica; Mechanical Properties; Organic-Inorganic Hybrid; Sol-Gel Process; Surface and Interface; FRACTURE-TOUGHNESS; TENSILE PROPERTIES; TOUGHENING MECHANISMS; FILLED EPOXY; NANOCOMPOSITES; COMPOSITES; POLYMERS; EPOXY/SILICA; MORPHOLOGY; PROPERTY;
D O I
10.1166/mex.2011.1042
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The article presents synthesis, characterization, mechanical properties and fracture behavior of the epoxy polymers reinforced with either pristine or epoxy functionalized silica nanoparticles. The nanoscale silica is prepared and functionalized in situ via acidic hydrolysis and pre-organization of different alkoxysilane precursors into the epoxy monomers. It is demonstrated that epoxide functionalization of silica nanoparticles not only improves their distribution in the epoxy polymer, but simultaneously enhances the strength [>60%], Young's modulus [>85%] and tensile toughness [>56%] of the resulting hybrids, without adversely affecting their ductility [<7%], even at 15 phr silica loading. The atomic force micrographs of the 'stress fractured' hybrid surfaces reveal that stronger interfacial interactions lead to the effective dispersal of stress and offer efficient resistance to crack propagation. Furthermore, different types of fracture mechanisms are investigated and it is evidenced that crack deflection is the most likely mechanism contributing to the improved mechanical performance of these hybrid epoxy/silica polymers.
引用
收藏
页码:299 / 306
页数:8
相关论文
共 42 条
[1]   Fracture toughness of nano- and micro-spherical silica-particle-filled epoxy composites [J].
Adachi, Tadaharu ;
Osaki, Mayuka ;
Araki, Wakako ;
Kwon, Soon-Chul .
ACTA MATERIALIA, 2008, 56 (09) :2101-2109
[2]   AFM substantiation of the fracture behavior and mechanical properties of sol-gel derived silica packed epoxy networks [J].
Afzal, Adeel ;
Siddiqi, Humaira M. ;
Mujahid, Adnan ;
Saeed, Shaukat .
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2012, 61 (01) :44-48
[3]   A comprehensive study of the bicontinuous epoxy-silica hybrid polymers: I. Synthesis, characterization and glass transition [J].
Afzal, Adeel ;
Siddiqi, Humaira M. .
POLYMER, 2011, 52 (06) :1345-1355
[4]  
ASTM-American Society for Testing and Materials, 2010, D88210 ASTM
[5]   Fatigue of hybrid epoxy composites: Epoxies containing rubber and hollow glass spheres [J].
Azimi, HR ;
Pearson, RA ;
Hertzberg, RW .
POLYMER ENGINEERING AND SCIENCE, 1996, 36 (18) :2352-2365
[6]   Nanoparticle polymer composites: Where two small worlds meet [J].
Balazs, Anna C. ;
Emrick, Todd ;
Russell, Thomas P. .
SCIENCE, 2006, 314 (5802) :1107-1110
[7]  
Coates J., ENCY ANAL CHEM APPL
[8]   Improving thermal conductivity while retaining high electrical resistivity of epoxy composites by incorporating silica-coated multi-walled carbon nanotubes [J].
Cui, Wei ;
Du, Feipeng ;
Zhao, Jinchao ;
Zhang, Wei ;
Yang, Yingkui ;
Xie, Xiaolin ;
Mai, Yiu-Wing .
CARBON, 2011, 49 (02) :495-500
[9]   Formation of silica/epoxy hybrid network polymers [J].
Davis, SR ;
Brough, AR ;
Atkinson, A .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2003, 315 (1-2) :197-205
[10]   CRACK DEFLECTION PROCESSES .1. THEORY [J].
FABER, KT ;
EVANS, AG .
ACTA METALLURGICA, 1983, 31 (04) :565-576