Preparation of environment‐friendly hydrophilic rubber from natural rubber grafted with sodium acrylate by reactive melt mixing

Abstract

In this research, we present an easy way to prepare environment-friendly hydrophilic rubbers derived from natural rubber (NR) grafted with sodium acrylate (NaAA) through reactive blending using an internal mixer operated at a rotor speed of 80 rpm and 150 C. The key parameters affecting the grafting efficiency of NR-g-NaAA were investigated in terms of the fill factor (FF) of the chamber, mixing time, and NaAA content. Lastly, the grafted sample (with a suitable grafting efficiency) was crosslinked using peroxide curing to produce X(NR-g-NaAA) as a hydrophilic NR sample. Results showed that grafting effi-

Molecular characteristics, mechanism of synthesis, adhesive properties of graft copolymer of chloroprene rubber with acrylic acid

“…As the hydrophilicity of the surface increases, the contact angle of wetting with water decreases, [ 22 ] a decrease in the contact angle by a factor of 1.43 on the surface of the graft copolymer compared to pure natural rubber is reported. [ 23 ] In our case, pure CPR applied to the surface of the skin has a contact angle of wetting with water of 67°. The contact angle of wetting with water of the CPR‐AA copolymer on the surface of the skin is 36°, that is, 1.86 times less than pure CPR (Figure 10).…”

“…Grafting efficiency of CPR‐AA samples tends to decrease with increasing [AA] from 1.4 M due to the higher rate of chain termination rather than free radical formation on CPR molecules at the initiation step. [ 23 ]…”

“…Grafting efficiency of CPR-AA samples tends to decrease with increasing [AA] from 1.4 M due to the higher rate of chain termination rather than free radical formation on CPR molecules at the initiation step. [23] Figure 3 shows a diagram of changes in grafting parameters with changes in PP concentration and reaction time. An increase in the concentration of PP leads to an increase in the active centers of initiation in the rubber macromolecule and a corresponding increase in the degree of grafting.…”

“…The high efficiency of grafting sodium acrylate to natural rubber led to a noticeable decrease in the contact angle of wetting with water from 103 to 72 . [23] On the other hand, graft copolymerization has a positive effect on the interfacial surface and improves compatibility in polymer systems. [24,25] In most cases, the values of the kinetic parameters of graft copolymerization differ from those of the radical polymerization of monomers.…”

Preparation of Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber and Its Effect on the Properties of Natural Rubber/Silica Composites

“…The C = O and C-O stretching vibrations appeared at 1663 and 1240 cm −1 , respectively. The peak at 1563 cm −1 was assigned to carboxylate (-COO − ), obtained by the partial neutralization of the acrylic acid with a basic compound [ 45 ]. A peak at 1613 cm −1 for NH bending was also observed.…”