A study on the preparation and properties of microwave-induced solid-phase grafting of maleic anhydride onto polypropylene
Polypropylene(PP)as a general-purpose plastic faces a surplus of conventional products and a serious shortage of functionalized products,and grafting modification of PP is an important method to achieve its high performance.In this paper,the polar monomer maleic anhydride(MAH)was grafted on the surface of PP by using microwave-induced solid-phase grafting,and the grafting rate was improved by adding the second monomer styrene(St),and the prepared maleic anhydride-grafted polypropylene(PP-g-MAH)was characterized.As indicated by the results the infrared spectra showed that PP was successfully grafted with MAH and St,and the maximum grafting rate could be as high as 1.4％after the addition of St.The melting points of the modified grafted products were almost unchanged,while the crystallization temperatures were increased to 110.8 ℃;the melt flow rates were all lower than 30 g/10min,which was a significant decrease compared with that of PP(38.7105 g/10min),and the complex viscosities were even improved from 53.828 Pa·s to 419.46 Pa·s;the contact angle between PP and water decreased from 125.4° to 100° at most,and the polarity of PP-g-MAH was increased with improved hydrophilicity.This study utilized microwave-induced solid-phase grafting of MAH on PP in a simple and efficient way,avoiding the molecular weight decrease while obtaining a high grafting rate and improving the properties of the material,so it has a broader application prospect.
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