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Synthesis of polybutadiene nanoparticles by emulsion polymerization: The effect of electrolyte and initiator type on particle size and reaction kinetics

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Synthesis of polybutadiene nanoparticles by emulsion polymerization: The effect of electrolyte and initiator type on particle size and reaction kinetics

Content Provider	Springer Nature Link
Author	Abdollahi, Mahdi Ranjbar, Heidar Ghahramani, Maral Yousefi, Mohammad Reza Najafi, Fardin Seyyed
Copyright Year	2016
Abstract	Emulsion polymerization of the butadiene (Bu) was performed in the presence of disproportionate potassium rosinate (DPR) as anionic emulsifier, potassium hydroxide (KOH), and potassium carbonate (K$_{2}$CO$_{3}$) as electrolytes, and three different initiators including potassium persulfate (KPS), 2,2$^{′}$-azobisisobutyronitrile (AIBN) or 4,4′-azobis(4-cyanovaleric acid) (ACVA, also known as VAZO) at 70 °C. Latexes were prepared with a solid content of about 30 wt%. The particle size and its distribution were measured by dynamic light scattering (DLS) analysis, while the polymerization conversion was determined gravimetrically at different time intervals. Results on the emulsion polymerization of Bu in the presence of KOH and K$_{2}$CO$_{3}$ co-electrolytes showed that adding KOH to the reaction media decreases the polymerization rate. Positive effect of co-electrolytes on the control over polybutadiene latex (PBL) particles size and its distribution was also confirmed, where K$_{2}$CO$_{3}$ played roles as electrolyte and pH buffer and KOH served double roles as electrolyte and alkaline supplier of the reaction media. Complete solubility of the AIBN in Bu resulted in higher rate of polymerization in the presence of AIBN in comparison to other initiators, i.e., VAZO or KPS. The results showed that initiator type plays a significant role on the formation of PBL nanoparticles and kinetics of the polymerization. The kinetic studies revealed that emulsion polymerization of Bu follows case 1 (i.e., $$\bar{n}$$ ≪0.5, where $$\bar{n}$$ indicates average number of the propagating chains per particle) of the Smith-Ewart kinetics.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	10261265
Journal	Iranian Polymer Journal
Volume Number	26
Issue Number	1
e-ISSN	17355265
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Emulsion polymerization Electrolyte Nanoparticle Initiator Kinetics Ceramics, Glass, Composites, Natural Materials Butadiene
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Polymers and Plastics

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