Free radical grafting of itaconic acid and glycidyl methacrylate onto PP initiated by organic peroxides

Abstract

ABSTRACT:Comparative analysis was conducted to learn the grafting of itaconic acid (IA) and glycidyl methacrylate (GMA) onto polypropylene (PP) in the course of reactive extrusion. Seven organic peroxides, which satisfactorily dissolve in PP, but do not dissolve in the monomer, were used to initiate free-radical reactions. The grafting of IA and GMA onto PP initiated by certain peroxides gave approximately equal amounts of grafted product. It was learned that the nature of peroxide initiators is decisive for grafting efficiency and degree of macromolecular degradation. To ensure a high yield of grafted product, it is advisable to use peroxides, which have thermodynamic affinity with PP and the temperature range of decomposition of which corresponds to the thermal regime of reactive extrusion. Di(tertbutyl peroxy-isopropyl)-benzene (P-14) appeared to meet for the most these requirements for grafting both GMA and IA. Grafting is accompanied by ␤-decomposition of the chains irrespective of the type of peroxide and monomer used; hence, the MFI increases. A considerable rise in MFI was observed at a minimum peroxide concentration (0.1wt %). Degradation of PP during modification eases its crystallization from the melt. In this case the crystallization temperature is 5 to 8.5°C higher than of the original PP, and the crystallinity degree increases by 20 to 60%.

Grafting of tetrahydrophthalic and maleic anhydride onto polyolefins in solution

“…For modified polyethylene such effects are scarcely reported in the literature. 26 In the case of polypropylene, functionalization generally leads to an increase in the crystallinity, which is attributed to chain scission and increased degree of order. 7,27,28 …”

Microwave-Assisted Synthesis and Characterization of Poly(itaconic acid) Grafted Gellan Gum

“…These groups bring additional capability of chelate formation in certain cases. The grafting of IA onto polypropylene, [16] low-density polyethylene, [17] chitin, [18] and sodium alginate [19] has been studied. Very few reports are available on gellan-grafted copolymers.…”

Weathering of low‐density polyethylene grafted with itaconic acid in laboratory tests

“…Itaconic acid (IA) is one of numerous compounds which can be grafted onto macromolecules of PE and other polyolefins. [4][5][6][7][8][9][10] Little attention has so far been paid in the reports to the problem of resistance of such copolymers to degradation, e.g., due to sunlight or elevated temperature. The article by Pesetskii et al on oxidation in water of PE grafted with IA makes an exemption to that rule.…”