Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : styrene

High Performance Concrete Improvement by Styrene-Butadiene Rubber Addition

Alaa Abdulhasan Atiyah; Saad B. H. Farid; Ahmed Saad Kadhim

Engineering and Technology Journal, 2016, Volume 34, Issue 12, Pages 2296-2309

In this paper, the properties of high performance concretes modified by polymer were studied. Liquid synthetic styrene-butadiene rubber (SBR) was added (5%, 10% and 15%) by weight of cement to high performance concrete (HPC) to elucidate the effect of the polymer additive to their properties.The compressive strength, splitting tensile strength, flexural strength, porosity, dry density and total water absorption were measured.Thermal conductivity, thermal diffusivity and specific heat of HPC isalso measured. In addition, SEM micrographs are compared reference and polymer modified HPC.The results show that there is an improvement in the workability for HPC after the addition of the polymer. Furthermore, the density of the set concrete was increased and both the porosity, total water absorption was decreased. Thermal conductivity, thermal diffusivity, and specific heat show improvement after polymer addition, which indicate better endurance.The SBR modified HPC, exhibits a significant improvement in splitting tensile strength and flexural strength, although it was at the expense of the compressive strength to some extent.The HPC has shown balanced microstructure before and after the addition of polymer, although they noticed improved on the ductile properties.

Preparation of Macroporous Styrene – Divinyl Benzene Copolymers

Matheel D. Al-Sabti; Jawad K. Jawad; Wisam F. Jacob

Engineering and Technology Journal, 2007, Volume 25, Issue 9, Pages 1041-1048

Suspension polymerization technique is used for the preparation of
macroporous Styrene – Divinylbenzene (S-DVB) copolymer beads with
different mole percent of divinylbenzene content in the presence of different
contents and types of diluents which gives the porosity to the copolymer. It
was found that increasing the percent of DVB with fixing the amount of
toluene diluent (72%) results in a decrease in toluene regain (T. R.) values
with increasing the degree of porosity. Increasing the percent of diluent with
fixing the amount of DVB (16%) results in an increase in (T. R.) values with a
decrease in the degree of porosity. Changing the type of diluent also has an
effect on the physical properties of the prepared copolymer. Addition of
polystyrene with toluene results in an increase in the degree of porosity. The
other physical properties of the copolymer, apparent density and void fraction
are also measured.
These copolymers are used as the base for the preparation of porous
cation exchangers (by sulfonation) and anion exchangers (by
chloromethylation and amination) under controlled experimental conditions.
The physical properties of the prepared ion exchangers were also measured,
with total exchange capacity (T. E. C.) and the rate of ion exchange (t1/2).