Functionalization and cross‐linking of high‐density polyethylene in the presence of dicumyl peroxide—An FTIR study

Abstract

High-density polyethylene was thermolysed with short-chain organic compounds (additives) with an ester functional group in the presence of free radical initiator such as dicumyl peroxide at 160°C. The experimental results inferred that an additive with a hydrogen donor containing a thiol group showed better efficiency toward functionalization and an additive with a methylene bridged group showed better efficiency toward cross-linking. The FTIR spectral results indicated that the area of the carbonyl peak at 1730 cm Ϫ1 increased with the increase in percentage grafting of additives with simultaneous increase of cross-linking.The ester grafting was further confirmed by saponification reaction. The possibility of acid functionalization via intramolecular hydrogen transfer was also checked through acid hydrolysis of the saponified products. A suitable reaction mechanism was proposed in order to explain the experimental and spectral data obtained.

Synthesis and characterizations of calcium di(meth)acrylate divinyl monomers and melt surface graft functionalization with linear low density poly(ethylene)

“…Anbarasan et al 30 explained the mechanism of free radical grafting of thioester onto HDPE backbone. Similar type of mechanism is applied here.…”

“…LLDPE (Rayson, India, M w -1,25,000 Da) was purchased and purified by the procedure followed in our earlier publication. 30 Toluene (Chemspure, AR, India) and acetone (Merck) were received and used without further purification. Dicumyl peroxide initiator (DCP, Across Chemicals, UK) and cyclohexane (Paxy chemicals, AR, India) were used as received.…”

“…Once all the LLDPE powder samples were dissolved in toluene, then cool it and 800 mL of acetone was added to precipitate the LLDPE. 30 The contents were filtered and dried at 60 C for 24 h under vacuum. The dissolution and precipitation process were repeated three times to further purify the LLDPE.…”

FTIR and thermal studies on esters grafted HDPE

“…Many experimental conditions including initiator, temperature and time, etc, were studied to determine % of cross linking and degradation that accompanies the grafting reaction 10 . Recently Anbarasan et al 11 studied the melt functionalization of HDPE with acrylic esters under molten condition. By thorough literature survey, we couldn't find any report based on order of C=C formation reaction for EM and EAA ester functionalized HDPE in the presence of DCP, under inert condition at 160°C.…”

SYNTHESIS AND CHARACTERIZATIONS OF POLY(ANILINE)/Sb2O3 NANO COMPOSITE

“…FTIR spectroscopy is used for both qualitative [17][18][19][20][21] and quantitative [22][23][24][25][26][27][28][29][30][31][32] analysis. By thorough literature survey, we could not find any report based on the FTIR based kinetics of effect of nano-sized material on the structure-property relationship of PANI.…”