Effect of reactive plasticizer on properties of polyphenylene oxide-polystyrene blend
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Date
2016-06
Authors
Najamunirahafiza Najamulhak
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Abstract
The use of diallyl ortho phthalate (DAOP) as reactive plasticiser of polystyrene/polyphenylene oxide blends (PPO/PS) was studied. The glass transition temperature (Tg), tensile properties and morphology of the 80PS/20PPO and reactive plasticized 80PS/PPO blends with allylic monomer (DAOP) over a wide range of compositions were investigated. Dicumyl peroxides (DCP) was used to initiate the cure reaction of DAOP. Curing characterization of DAOP with different weight percents (wt%) of DCP using DSC indicated single exothermic peak. Tgs of the 80PS/20PPO and various 80PS/PPO/DAOP-DCP blends were obtained through the DSC scan and the result was compared with Fox equation. The results of tensile strength, elongation at break and tensile modulus were recorded. SEM observations of the 80PS/20PPO and PS/PPO/DAOP-DCP blends at different compositions revealed the morphology of the surface fracture blends. Based on curing characterization using DSC, 5 wt% of DCP was chosen to be used to cure DAOP in PS/PPO/DAOP blends due to its optimum heat of reaction and peak temperature. A single Tg of 80PS/20PPO and PS/PPO/DAOP-DCP blends observed at different compositions suggested the miscibility of the blend. Tensile test, indicated that the tensile strength and tensile modulus of the 80PS/PPO improved with increasing composition of DAOP-DCP but reduced in the elongation at break. The morphology of the samples fractured surface showed that decreasing the PPO and increasing DAOP content leads to increase in tensile strength and tensile modulus but decrease of elongation at break due to the reinforcement effect of the cured DAOP reactive plasticizer.