Outstanding Practical Problems in Emulsion Polymerization with Particular Reference to Dienic Hydrocarbons

1970 ◽  
Vol 43 (6) ◽  
pp. 1451-1464 ◽  
Author(s):  
E. W. Duck
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Emulsion Polymerization ◽  
Latex Particle ◽  
Film Forming ◽  
Solids Content ◽  
Styrene Butadiene

Abstract The incentives and problems associated with 100% conversions of polymerization are discussed with reference to the heterogeneity produced by emulsion polymerization of styrene-butadiene rubbery copolymers. Stereospecific problems are also considered together with the influence of latex particle size and particle size distribution on viscosity and solids content and film-forming properties.

Semibatch Seeded Emulsion Polymerization of Acrylic Monomers: Bimodal Particle Size Distribution

1997 ◽  
Vol 34 (7) ◽  
pp. 1221-1236 ◽  
Author(s):  
Chorng-Shyan Chern ◽  
Tseng-Jung Chen ◽  
Shinn-Yih Wu ◽  
Horng-Bin Chu ◽  
Chun-Fu Huang
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Emulsion Polymerization ◽  
Seeded Emulsion Polymerization ◽  
Acrylic Monomers

Effects of Emulsifier Concentration on Nucleation Mode of Emulsion Polymerization of Styrene

2013 ◽  
Vol 395-396 ◽  
pp. 399-402 ◽  
Author(s):  
Li Bao Mei ◽  
Xiao Qin Xiao ◽  
Yong Li ◽  
Yan Lin Sun
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Emulsion Polymerization ◽  
Homogeneous Nucleation ◽  
Particle Number ◽  
Nucleation Mode ◽  
P Fraction ◽  
Emulsifier Concentration

The nucleation mode of emulsion polymerization of styrene under different emulsifier (SDS) concentrations is studied in this paper. Some factors such as conversion, particle number (Np), fraction of coverage, polydispersion index (PDI) and particle size distribution (PSD) of the reactions were investigated. The results show that when [SD is less than its CMC, homogeneous nucleation dominates. But when [SD is more than its CMC, micelle nucleation plays the major role.

Particle Size Distribution of SBR and NBR Latexes by UV-VIS Turbidimetry near the Rayleigh Region

1996 ◽  
Vol 69 (4) ◽  
pp. 696-712 ◽  
Author(s):  
Mario A. Llosent ◽  
Luis M. Gugliotta ◽  
Gregorio R. Meira
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Average Diameter ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Data Treatment ◽  
Distribution Shape ◽  
Soft Polymer ◽  
Styrene Butadiene

Abstract This paper deals with data treatment problems that arise when turbidimetry is employed to estimate the particle size distribution (PSD) of soft polymer latexes with low diameter limits around 40 nm. Scanning electron microscopy and dynamic light scattering were used as comparison techniques. Industrial latexes of styrene-butadiene rubber (SBR) and of acrylonitrile-butadiene rubber (NBR) were investigated. The data treatment involved the use of Mie's Model to obtain an average diameter and/or the complete PSD. For estimating the complete PSD, a least squares optimization (with an imposed distribution shape) and a numerical deconvolution procedure (without assumptions on the distribution shape) were attempted. A synthetic example was solved to investigate the limits of the applied numerical methods. For the polymer refractive index functions, Cauchy's Law was used — and its adequate adjustment proved essential for good turbidimetric estimations. A reasonable agreement between the turbidity measurements and the other independent estimations was verified. For the SEM observations, the soft latexes were hardened by irradiation before observation, but negligible diameter variations were detected.

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