Abstract
This study is based upon the functionalization of polypropylene (PP) by radical polymerization to optimize its properties by influencing its molecular weight. Grafting of PP was done at different concentrations of maleic anhydride (MAH) and benzoyl peroxide (BPO). The effect on viscosity during and after the reaction was studied by torque rheometer and melt flow index. Results showed that a higher concentration of BPO led to excessive side-chain reactions. At a high percentage of grafting, lower molecular weight product was produced, which was analyzed by viscosity change during and after the reaction. Percentage crystallinity increased by grafting due to the shorter chains, which consequently led to an improvement in the chain’s packing. Prepared Maleic anhydride grafted polypropylene (MAH-g-PP) enhanced interactions in PP-PET blends caused a partially homogeneous blend with less voids.
Highlights
Polypropylene (PP) is the second-largest consumable polymer due to its better mechanical properties, flexibility, transparency, low cost, ease in processability, and high chemical and moisture resistance [1]
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In this study, grafting of PP by MAH was carried out using a torque rheometer
Summary
Polypropylene (PP) is the second-largest consumable polymer due to its better mechanical properties, flexibility, transparency, low cost, ease in processability, and high chemical and moisture resistance [1]. The solution process was initially used for the grafting of MAH on PP, and high reaction yields were achieved [7,8,17]. MAH was grafted on PP by melt technique by reactive extrusion at varying MAH concentrations, type and amount of initiator, and processing conditions [4,6,7,11,18,19]. The effect of MAH and BPO concentrations on the polymers chains’ behavior throughout the reaction during the reactive extrusion process is discussed in this study. To check the effect of Maleic anhydride grafted polypropylene MAH-g-PP as a compatibilizer, grafted PP was added in polyethylene terephthalate (PET) blends at varying concentrations. Film grade PET was provided by Gatron Industries limited Karachi, Pakistan
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