TY - JOUR
T1 - Crosslinking of poly(vinyl acetate) nanolatices by gamma and UV radiation
AU - Meléndez-Ortiz, Iván
AU - Flores-Martínez, Raúl
AU - Bucio, Emilio
AU - Cortez-Mazatán, Gladis
AU - Martínez-Gutiérrez, Hugo
AU - Peralta, René D.
PY - 2012/11/15
Y1 - 2012/11/15
N2 - Poly(vinyl acetate) PVAc, in nanolatices with 10% polymer content, prepared by microemulsion polymerization was crosslinked by gamma and UV radiation. PVAc colloidal nanoparticles (average diameter, Dp = 58 nm) had M w = 562,000 g/mol and about 95% conversions. PVAc nanolatices irradiated by gamma rays (1-13 kGy) at room temperature without crosslinking agent and by UV light (30-300 s exposure times) in the presence of divinylbenzene and allyl methacrylate showed crosslinking of up to 96% (high gel content), Dp < 100 nm and did not degrade as shown by FTIR spectroscopy. DSC and TGA characterization of irradiated PVAc samples indicated that T g temperatures increased from 28°C for PVAc to 42°C and 39°C for UV and gamma rays crosslinked PVAc, respectively, whereas 10% weight losses occurred at 261°C for uncrosslinked PVAc and at 320 and 313°C for UV and gamma rays crosslinked PVAc.
AB - Poly(vinyl acetate) PVAc, in nanolatices with 10% polymer content, prepared by microemulsion polymerization was crosslinked by gamma and UV radiation. PVAc colloidal nanoparticles (average diameter, Dp = 58 nm) had M w = 562,000 g/mol and about 95% conversions. PVAc nanolatices irradiated by gamma rays (1-13 kGy) at room temperature without crosslinking agent and by UV light (30-300 s exposure times) in the presence of divinylbenzene and allyl methacrylate showed crosslinking of up to 96% (high gel content), Dp < 100 nm and did not degrade as shown by FTIR spectroscopy. DSC and TGA characterization of irradiated PVAc samples indicated that T g temperatures increased from 28°C for PVAc to 42°C and 39°C for UV and gamma rays crosslinked PVAc, respectively, whereas 10% weight losses occurred at 261°C for uncrosslinked PVAc and at 320 and 313°C for UV and gamma rays crosslinked PVAc.
KW - crosslinking
KW - gamma radiation
KW - microemulsion
KW - nanolatex
KW - poly(vinyl acetate)
UR - http://www.scopus.com/inward/record.url?scp=84864754487&partnerID=8YFLogxK
U2 - 10.1002/app.37002
DO - 10.1002/app.37002
M3 - Artículo
SN - 0021-8995
VL - 126
SP - 1328
EP - 1336
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
IS - 4
ER -