Photosensitized grafting of acrylamide and hydroxyethyl methacrylate onto cellulose

A self-prepared novel bifunctional vinyl monomer diethylene glycol dimethacrylate (EGDMA-2) was graft copolymerized onto silk fibers initiated by potassium persulfate (KPS). The moisture regain and fiber fineness of grafted silk fibers increased linearly with graft yield. The enhancement of hygroscopicity can improve the comfort of silk fabrics. The grafting conditions caused a partial degradation of the tensile strength of silk fibers, as well as the whiteness. Elongation at break increased and initial modulus decreased, which indicated that the rigidity of silk fibers declined. Stress relaxation behavior shows that grafted silk fibers have better viscoelasticity than control silk fibers. Wrinkle recovery angle tests showed that grafted silk fabrics had better wrinkle resistance property. Laundering durability test showed that with increasing graft yield, the damage to the silk fibers during laundering decreased obviously.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Properties of silk fibers modified with diethylene glycol dimethacrylate

Chen

Guan

Xing

et al. 2006

“…Extensive research has been conducted7–17 on graft copolymerization of various monomers onto natural cellulose materials by using UV‐radiation. Most of the early works reported used the simultaneous irradiation and grafting method, in which the radiolysis of all components, such as parent polymer, monomer, solvent, and other additives, are factors in initiating graft copolymer reaction.…”

Section: Introductionmentioning

confidence: 99%

UV‐radiation–induced preirradiation grafting of methyl methacrylate onto lignocellulose fiber in an aqueous medium and characterization

Khan

Ahmad

Kronfli

2003

ABSTRACT:The preirradiation method of grafting has been established by ultraviolet radiation. Methyl methacrylate (MMA) was grafted onto jute fiber in an aqueous medium. The variation of graft weight with UV-radiation time, monomer concentration, and reaction time was investigated. The conversion of monomer into homopolymer and graft copolymer was evaluated. The graft weight passes through a maximum value (ϳ 122%) with UV-radiation time. The optimum value of the monomer concentration was evaluated for maximum degree of grafting. Graft copolymerization of MMA onto lignocellulose fiber significantly increases the elongation at break (ϳ 65%) compared to that of the "as-received" sample. However, a linear decrease on breaking load was observed with the increase of graft weight. The estimation of degree of grafting was achieved using an IR technique by correlating band intensities with the degree of grafting. Considering the water-absorption property, the grafted sample showed a maximum up to 61% decrease in hydrophilicity compared to that of the as-received sample.

“…The formation of peroxide on PE film and in water medium by photoirradiation seems to be a factor for the accelerated polymerization shown in Figures 1 and 2. Uyama and Ikada'l studied grafting of acrylamide onto films of polypropylene, nylon 6, and ethylene-vinyl acetate copolymer that had been UV-preirradiated in air atmosphere. They concluded that the species initiating the grafting would be peroxides that had been generated upon UV-irradiation in air.…”

Section: Resultsmentioning

confidence: 99%

“…(5) and its decomposition by eq. (6), participate in the initiation of the grafting reaction according to eq. ( 7 ) , rather than by the initiation according to eq.…”

Section: Resultsmentioning

confidence: 99%

Photografting of acrylonitrile and methacrylic acid on polyethylene film under air atmosphere

Kubota

1993

SYNOPSISPhotografting of acrylonitrile (AN) and methacrylic acid ( M A A ) on low-density polyethylene film (thickness 70 pm) , on which benzophenone was coated earlier, was investigated a t 60°C in water medium under air atmosphere. In the case of AN monomer, where grafted polymer was formed predominantly, oxygen in the system promoted the formation of both grafted polymer and homopolymer. With MAA monomer, in which homopolymer was formed preferentially compared to the formation of grafted polymer, the formation of homopolymer was accelerated by the presence of oxygen while suppressing that of grafted polymer. The formation of polyethylene peroxides by photoirradiation seemed to be a factor for the accelerated polymerization under air atmosphere. It was found that additives such as hydrazine and metallic ions (Fez+, Cu2+, and Ni2+) are useful for enhancing the photografting under air atmosphere.