Continuous photografting of HEMA onto polypropylene fabrics with benzophenone Photoinitiator

Abstract

Continuous photografting onto polypropylene fabrics in the absence of inert gases was carried out to improve hydrophilic property of PP fabrics, which was padded with a formulated solution of 2-hydroxyethyl methacrylate(HEMA) and benzophenone as a monomer and a photoinitiator, respectively. The grafting yield increased with increases in benzophenone concentration up to 30 % on the weight of the monomer and UV energy up to of 38 J/cm 2 , while 30 % HEMA concentration was optimal for the grafting efficiency. The physicochemical properties of the grafted PP fabrics were monitored by FT-IR, SEM, zeta potential, and dyeability to a cationic dye. The grafting increased O 1s /C 1s content and remarkably produced more negative zeta potentials compared with the pristine PP fabric. Also the grafted PP showed the increased dyeability to cationic dyes with increasing graft yield resulting from the enhanced electrostatic interaction between the dyes and negatively charged surface of the grafted PP fiber. In addition, improved hydrophilic property of grafted PP fabrics was ascertained by more rapid water wetting time and higher water absorbency.

Polypropylene/poly (butylene terephthalate) melt spun alloy fibers dyeable with carrier-free exhaust dyeing as an environmentally friendlier process

“…a dyeable PP fiber under the name of CoolVisions Ò has been claimed by the FiberVisions company (FiberVisions, 2010). However, to solve the mentioned problem numerous attempts have been carried out to modify polypropylene to make it dyeable from aqueous liquor at atmospheric condition through various approaches such as gamma radiation (Kaur and Misra, 1987), chemical oxidation treatment and functionalization (Tehrani Bagha et al, 2004;Choi and Park, 2008), plasma treatment (Klein et al, 2000;Yaman et al, 2009), graft copolymerization (Bhattacharya and Inamdar, 2007;Jang and Go, 2008), and producing the dyeable alloy fibers by polymer blending processes (Marcincin et al, 2000;Prchal et al, 1997;Kotek et al, 2004;Huang et al, 2005;Yu et al, 2007;Teli et al, 2004). Some recent researches for preparation of dyeable PP fibers devoted to low molecular weight compounds and nanoparticles (Toshniwal et al, 2007;Yu et al, 2009), dendrimers (Froehling and Burkinshaw, 2001) and hyperbranched polymers (Burkinshaw et al, 2002).…”

Non-biodegradable polymer particles for drug delivery: A new technology for “bio-active” restorative materials

“…The equilibrium mass swelling ratio (q) in solvent×(I70: 70 vol% isopropanol, H2O: distilled water) was calculated as: qx=Ws/Wd, and the H-index was determined as: H=qI70/qH2O. groups 26,27) . The zeta potential of each polymer particle was measured, and all five polymers presented a negative surface charge but their charges were not significantly different (Table 1).…”

Hydrophilic modification of PET fabric via continuous photografting of acrylic acid (AA) and hydroxyethyl methacrylate (HEMA)

“…Previous studies have already shown that the cationic dyeability of PET can be improved by UV irradiation alone because the UV light can introduce peroxide or carboxylic acid groups on the surface by photooxidation [16,18,19]. Therefore, the increases in K/S and exhaustion by grafting can be easily understood that the polar groups of -COOH or -OH on the fabric improve affinity to cationic dyes due to the ionic and polar interactions between the grafted fabrics and the dyes [20]. The HEMA-grafted PET fabrics may have a higher accessibility of dye due to rather bulky monomer structure and possible photodegradation of the grafted polyHEMA during photografting, which contributes to the higher dyeability of HEMAgrafted PET compared to the AA grafted ones.…”