The role of hydroperoxides as a precursor in the radiation-induced graft polymerization of methyl methacrylate to ultra-high molecular weight polyethylene

Friction, wear, and tensile properties of vacuum hot pressing crosslinked UHMWPE/nano‐HAP composites

“…7,8 Several techniques have been used to improve wear resistance of UHMWPE, such as ion implantation, 9,10 grafting, 11 radiation crosslinking, 12,13 and filling. 8,14 However, ion implantation and grafting only form a shallow penetration depth on UHMWPE surface, [15][16][17] which is not suitable for the long time service of artificial joints. Radiation crosslinking and filling have attracted more attention to enhance wear resistance of UHMWPE.…”

The Aging of Polymers under Electromagnetic Radiation

“…Indeed, Arya et al [ 59 ] assert that free volume conceptualization entails the total mass that polymer chains do not occupy; thus, diffusing molecules are able to occupy it. Solvents raise a polymer’s free volumes as well as the degree of diffusion occurring in its free volume chains [ 60 , 61 ]. The theory posits that the extra, unoccupied total mass in polymeric materials fosters mass transport within the polymer structure [ 59 ].…”

“… The study supports the theory of polymer reaction as free radicals react with permeating molecules [ 59 ] Arya et al Glassy Polymers—diffusion, sorption, ageing and applications Quantitative research using diffusion models to explain polymer aging Minute molecules of polymers diffuse with changes in temperature and concentrations. Changes in the external conditions lead to reactions with polymer molecules [ 60 ] Enomoto et al The role of hydroperoxides as a precursor in the radiation-induced graft polymerization of methyl methacrylate to ultra-high-molecular-weight polyethylene A quantitative research method using grafting technique was implemented Solvents increase the free volumes of polymers as diffusion progresses through the free-volume chains. Hydroperoxides can be used as solvents to increase the diffusion of polymer molecules through free volumes [ 61 ] Ching et al Effects of high temperature and ultraviolet radiation on polymer composites A literature review methodology was used High thermal conditions and UV radiations weaken the mechanical properties of polymer composites.…”

LDPE Oxidation by CO2 Laser Radiation (10.6 µm)

“…IR absorption band from OH groups increased during thermooxidation reactions because there is a disequilibrium in the formation and consumption of hydroperoxides throughout the formation of carbonyls, esters, lactones, and ketones groups [22]. Hydroperoxides accumulate in the polymer matrix during thermooxidation reaction of PE, unlike the photooxidation reaction, where they do not accumulate [23][24][25]. Therefore, CO 2 laser radiation is able to oxidize LDPE films by thermooxidation reactions.…”