scholarly journals The Impact Toughness and Hardness of Treated and Untreated Sisal Fibre-Epoxy Resin Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Wilson Webo ◽  
Leonard Masu ◽  
Maina Maringa
Keyword(s):  
Impact Toughness ◽  
Epoxy Resin ◽  
Chemical Treatment ◽  
Alkali Treatment ◽  
Reinforced Composites ◽  
Mechanical Interlocking ◽  
Sisal Fibre ◽  
Treatment Processes ◽  
The Impact ◽  
Fibre Reinforced Composites

The effect of the combined chemical treatment of sisal fibres through the subsequent processes of mercerisation (alkali treatment), then silane treatment and eventually acid hydrolysis, on sisal fibre was investigated. The effect of the treated fibres on the impact toughness and hardness of their composites with epoxy resin was also studied. Scanning electron microscopy of the surfaces of the treated and untreated fibres showed that the chemical treatment processes enhanced the removal of surface impurities and therefore increased the roughness of the surfaces of the fibres. This avails an increased surface area for interlocking with matrix and is, therefore, expected to enhance adhesion of the two. The treated fibre reinforced composites were observed to have higher values of impact toughness and hardness than the untreated fibre reinforced composites. These higher values were attributed to better interfacial bonding due to better mechanical interlocking between the treated fibres and epoxy resin arising from the increased roughness of the treated fibres.

The Combined Effect of Mercerisation, Silane Treatment and Acid Hydrolysis on the Mechanical Properties of Sisal Fibre/Epoxy Resin Composites

MRS Advances ◽  
2020 ◽  
Vol 5 (23-24) ◽  
pp. 1225-1233
Author(s):  
Wilson Webo ◽  
Maina Maringa ◽  
Leonard Masu
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Flexural Strength ◽  
Epoxy Resin ◽  
Compression Strength ◽  
Silane Treatment ◽  
Reinforced Composites ◽  
Sisal Fibre ◽  
Strength And Stiffness ◽  
Fibre Reinforced Composites

ABSTRACTThe effect of the combined chemical treatment of sisal fibres through the subsequent processes of mercerisation (alkali-treatment), then silane treatment and eventually acid hydrolysis, on sisal fibre were investigated. The effect of the treated fibres on the tensile strength and stiffness, flexural strength and stiffness, compression strength and shear strength of their composites with epoxy resin were also studied. Scanning electron microscopy studies of the surfaces of the treated and untreated fibres showed that the chemical treatment processes enhanced the removal of surface extractives and therefore increased the roughness of the surfaces of the fibres in the range of 20 % - 70 %. This avails an increased reinforcement surface area for interlocking with matrix and is, therefore, expected to enhance adhesion of the two. The treated fibre reinforced composites were observed to have higher values of tensile strength and stiffness, flexural strength and stiffness, compression strength and shear strength than the un-treated fibre reinforced composites. These higher values were attributed to better interfacial bonding due to better mechanical interlocking between the treated fibres and epoxy resin arising from the increased roughness of the treated fibres.

scholarly journals Investigations on the impact behaviour of fibre-reinforced composites: effect of impact energy and impactor shape

2020 ◽  
Vol 28 ◽  
pp. 106-115
Author(s):  
Haibao Liu ◽  
Jun Liu ◽  
Yuzhe Ding ◽  
Zoe Hall ◽  
Lilong Luo ◽  
...  
Keyword(s):  
Impact Energy ◽  
Reinforced Composites ◽  
Impact Behaviour ◽  
The Impact ◽  
Fibre Reinforced Composites

Mechanical and Thermal Properties of Siloxane Reinforced Biphenyldiol Formaldehyde Resin Curing Epoxy Resin Composites

2014 ◽  
Vol 936 ◽  
pp. 3-7
Author(s):  
Shi Hui Chen ◽  
Jun Gang Gao ◽  
Hong Zhe Han ◽  
Chao Wang
Keyword(s):  
Epoxy Resin ◽  
Impact Resistance ◽  
Resin Matrix ◽  
Formaldehyde Resin ◽  
Mechanical And Thermal Properties ◽  
Reinforced Composites ◽  
Interfacial Bonding Strength ◽  
Resin Curing ◽  
Degradation Properties ◽  
The Impact

In order to modify the properties of the epoxy composites, an alkali catalyzed biphenyldiol formaldehyde resin (BPFR) was synthesized and used to cure epoxy resin (ER). γ-Glycidoxypropyl trimethoxysilane (KH-560) was used as a reinforcer of the composites. Laminates of the BPFR/ER fiberglass reinforced composites with different (KH-560) contents were prepared. The influence of the KH-560 content on the glass transition temperature (Tg) and thermal degradation properties of the composites was researched by dynamic mechanical analyzer (DMA) and thermogravimetric analysis (TG). The mechanical, electrical properties of the composites were determined. The results showed that the interfacial bonding strength between resin matrix and fiberglass can be efficiently improved with the presence of KH-560. When the ratio of BPFR and ER is 3 : 7, the content of KH-560 is 5 ~7 wt%, the impact resistance of the fiberglass reinforced composites is 61.35~78.59 kJ/m2, the tensile resistance is 150.37~162.54 MPa, which are all 30 % higher than that of no added; The dielectric constant ε and dielectric loss tanδ of the composites is between 0.50~0.68 and between 0.008~0.01, respectively.

Research on Synthesis and Properties of a Flexible Epoxy Curing Agent

2015 ◽  
Vol 744-746 ◽  
pp. 1463-1466
Author(s):  
Xi Wang
Keyword(s):  
Fracture Toughness ◽  
Impact Toughness ◽  
Epoxy Resin ◽  
Curing Agent ◽  
Pure Epoxy ◽  
Epoxy Curing ◽  
New Type ◽  
The Impact

This paper presents the synthesis of a new type of flexible epoxy curing agent and an approach to improve the toughness of epoxy resin by curing without reducing the strength and modulus of the resin-cured material. The results show that the degree of toughness reaches maximum values when the flexible curing agent is applied at weight percentages (wt.%) between 10% and 15%. When the amount of flexible curing agent added to epoxy resin weight is 10wt.%, the impact toughness and fracture toughness increases by 33.3% and 96.3%, respectively, compared with the pure epoxy resin. When the amount of flexible curing agent added to epoxy is 10wt.%, the resulting impact thoughness of the material is 19.5 kJ•m-2 at-50°C, the impact toughness of pure epoxy resin is only 7.96 kJ•m-2.

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