Porous Epoxy: Effect of Mixing Sequences (ELH versus EHL) Using Toluene as Extraction Medium via Ultrasonic Technique

Porous epoxy was fabricated using natural rubber latex (NRL) as the void template. In this study, two mixing sequences were selected: epoxy, hardener, and then latex (EHL) and epoxy, latex, and then hardener (ELH). The extraction process was carried out to extract the latex particles from the cured epoxy sample using toluene as extraction medium with ultrasonic technique for 1 hour. The formation of porous structure in epoxy system is dependent essentially on the amount of latex removed from the epoxy matrix. As expected, the density results showed lower values in the porous epoxy in ELH mixing sequences. More porous structure in epoxy was obtained which was proven by the increasing in porosity % which has led to lowering of the value in dielectric constant which is preferred for electronic packaging application. However, it also caused a decrease in flexural strength and modulus.

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Improvement of flexural strength of concrete pavements using natural rubber latex

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.122704 ◽

2021 ◽

Vol 282 ◽

pp. 122704

Author(s):

Teerasak Yaowarat ◽

Apichat Suddeepong ◽

Menglim Hoy ◽

Suksun Horpibulsuk ◽

Thaworn Takaikaew ◽

...

Keyword(s):

Flexural Strength ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Concrete Pavements ◽

Rubber Latex

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The Effects of Extraction Mediums on the Properties of Porous Epoxy Using Natural Rubber Latex as Void Template

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.795.299 ◽

2013 ◽

Vol 795 ◽

pp. 299-303

Author(s):

S.N. Ishak ◽

P.L. Teh ◽

Du Ngoc Uy Lan ◽

C.K. Yeoh ◽

J.L. Phua

Keyword(s):

Dielectric Constant ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Water Medium ◽

Distilled Water ◽

Rubber Latex ◽

Constant Property ◽

Latex Particles ◽

Lower Dielectric Constant ◽

Different Types

Porous epoxy was fabricated by using natural rubber latex particles as the void template which were extracted after by different types of extraction mediums such of distilled water and toluene under ultrasonic. As expected, the increase in latex content from 0.5, 1.0, 1.5 to 2.0 phr in porous epoxy produced the higher porosities as well as lower dielectric constant property. Furthermore, toluene medium extracted more NR latex particles and produced more porous in epoxy matrix compared to distilled water medium. Therefore, porous epoxy from toluene extraction exhibited better dielectric constant property, which is preferred for electronic packaging application. Besides that, the mechanical properties also showed a reasonable reduction in flexural strength and modulus of the epoxy porous obtained from toluene extraction compared to distilled water extraction.

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