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Chinese Journal of Materials Research  2016, Vol. 30 Issue (11): 868-874    DOI: 10.11901/1005.3093.2016.098
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AgCl Nano-cubics Used as Photoinitiator for Polymerizing Monodispersed Polystyrene Microspheres
Ying YANG,Yan ZHAO,Yukun YAN,Jinsong ZHANG
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Ying YANG,Yan ZHAO,Yukun YAN,Jinsong ZHANG. AgCl Nano-cubics Used as Photoinitiator for Polymerizing Monodispersed Polystyrene Microspheres. Chinese Journal of Materials Research, 2016, 30(11): 868-874.

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Abstract  

Mono-dispersed polystyrene microspheres were prepare by UV irradiation assisted polymerization of styrene monomer with AgCl nano-cubic particles as photoinitiator and polyvinylpyrrolidone (PVP) as dispersion stabilizer. The morphology, molecular structure and glass transition temperature of the polymers were characterized by SEM, FT-IR and DSC respectively. From the polymerization dynamics, it follows that the photopolymerization process was a first order reaction. The photopolymerization reaction could be identified as a kind of free radical polymerization, while CH3CH2O was the active group in the photopolymerization. Besides, AgCl nano-cubic particles were stable under UV irradiation.

Key words:  organic polymer materials      AgCl      photoinitiate      polystyrene microspheres      polymerize     
Received:  16 February 2016     

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.098     OR     https://www.cjmr.org/EN/Y2016/V30/I11/868

Fig.1  SEM image of the AgCl particles (a) and size distribution of the AgCl particles (b)
Fig.2  Digital photo of AgCl colloid under UV irradiation for different time
Fig.3  SEM image of AgCl nanocubes after UV irradiation for 10 min
Fig.4  XRD patterns of AgCl nanoparticles under UV-irradiated for 0 min (a) and 120 min (b)
Fig.5  SEM image of photoinitiated polystyrene microspheres (a) and size distribution of PS microspheres (b)
Fig.6  FTIR spectra of polystyrene
Fig.7  DSC thermogram of PS (a) photoinitiated polystyrene microspheres; (b) common thermally induced polystyrene microspheres (the heating rate is 5℃/min) Vst=0.5 mL, VAgCl=4 mL, VC2H5OH=10 mL, mPVP=0.0375 g, reaction time=1 h
Reaction time/h mn / Da mw / Da PDI
1 10629 14657 1.379
2 25584 39864 1.558
3 33600 50687 1.509
4 46278 72795 1.573
5 52778 81384 1.542
6 96604 154759 1.602
Table 1  Molecular weight determined by GPC for different reaction time
Fig.8  Kinetic curve of polymerization with different reaction time. VSt=0.5 mL, VAgCl=4 mL, VC2H5OH=10 mL, mPVP=0.0375 g
Runa Adding AgCl particles or not Salicylic acid/g Degassing/ Time(min) α(%)b Mnc(Da) Polydispersity index(Mw/ Mn)
1 Yes - N2/25 26.06 33600 1.509
2 Yes 0.0054 N2/25 25.97 32945 1.537
3 Yes - O2/25 - - -
4 No - N2/25 - - -
Table2  UV-light induced polymerization of styrene using AgCl as initiator
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