Study of the effect of natural rubber‐graft‐o‐aminophenol on the thermal stability and mechanical properties of nitrile rubber

Abstract

The grafting copolymerization of natural rubber and o-aminophenol was carried out by using tworoll mill machine. The prepared grafted antioxidant, NRgraft-o-AP, analyzed by using Infrared and 1 H-NMR Spectroscopy techniques. The thermal stability, mechanical properties, and ultrasonic attenuation coefficient were evaluated for NBR vulcanizates containing the commercial antioxidant, PBN, and the prepared grafted antioxidant, NR-graft-o-AP, and the control vulcanizate. Results of the thermal stability indicate that the prepared NR-graft-o-AP can protect NBR vulcanizate against thermal treatment much better than the commercial antioxidant, PBN, and control mix, respectively. The prepared grafted antioxidant improves the mechanical properties of NBR vulcanizate.

Preparation and properties of natural rubber latex-g-modified cationic polyacrylamide copolymers and its palm oil absorbent

“…ATR-FTIR spectroscopy revealed that MCPAM was chemically attached to the NR particles, as observed by the bands at 3300-3500 cm -1 that refer to amine groups and at 1659 and 952 cm -1 and the amide quaternary ammonium groups. In addition, the chemical structure of NR-g-MCPAM was confirmed at 180 (carbonyl group) and 176 (ester group) ppm by using solid state 13 C NMR. The thermal stability of NR and CPAM was significantly altered after modification with MCPAM due to the grafting copolymer as observed from the TGA.…”

Phenolic antioxidants based on calixarene: Synthesis, structural characterization, and antioxidative properties in natural rubber

“…Moreover, the reaction conditions are harsh, and the post‐treatment is relatively complicated. The other one is to directly synthesize macromolecular antioxidants with the reactive monomers containing antioxidative groups or chemically graft antioxidative groups onto organic backbones with high molecular weight . Beer et al .…”

“…The other one is to directly synthesize macromolecular antioxidants with the reactive monomers containing antioxidative groups or chemically graft antioxidative groups onto organic backbones with high molecular weight. [16][17][18][19][20] Beer et al firstly synthesized a,x-diene monomers bearing one alcohol functionality from 10-undecenoic acid, and then reacted with 3,5-di-tert-butyl-4-hydroxy-cinnamic acid or 3-(3,5-di-tert-4-hydroxyphenyl) propanoic acid to prepare hindered phenolic macromolecular antioxidants for enhanced long-term stabilization of polyolefin. 21 In our previous work, we synthesized a star-shaped macromolecular antioxidant by grafting 2,6-di-tert-butyl-4-hydroxy methyl phenol onto per-2,3-acetyl-bcyclodextrin with isophorone diisocyanate as linkage.…”

Synthesis and characterization of polyhydroxylated polybutadiene binding 2,2′‐thiobis(4‐methyl‐6‐tert‐butylphenol) with isophorone diisocyanate

“…Due to low thermal stability, poor migration resistance and poor extraction resistance, the physical loss of low molecular weight antioxidant was large during polymer processing and long‐term service, which severely restricted its applications. In order to overcome the problem, macromolecular antioxidant had attracted much attention in recent years . For example, Kim synthesized several kinds of polymeric antioxidants by copolymerization or homopolymerization of functional monomers containing hindered phenol.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] For example, synthesized several kinds of polymeric antioxidants by copolymerization or homopolymerization of functional monomers containing hindered phenol. El-Wakil et al [9][10][11][12] studied the grafting of o-aminophenol, 1,2-phenylenediamine,1,5-diaminonaphthalene, and N-(4-aminodiphenyl methane) acrylamide onto natural rubber. Podesva 13,14 synthesized a polymer-bound antioxidant by free radical addition reaction between a hindered phenolic antioxidant with a sulfanyl group and hydroxylterminated polybutadiene.…”