Emulsion dispersion: Difference between revisions
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Emulsions are thermodynamically unstable liquid/liquid dispersions that are stabilized, in general, by surfactants [1]. Surfactants are usually added to emulsion systems, assembling in the interface of the emulsion droplets, thus providing a protective membrane that prevents the droplets from flocculating or coalescing and thus enhancing the droplets formation and stability [2]. Emulsion dispersion is not about reactor blends for which one polymer is polymerized from its monomer in the presence of the other polymers; emulsion dispersion is a novel method of choice for the preparation of homogeneous blends of thermoplastic and elastomer [3]. The surfactant molecules adsorb on the surface of emulsion by creating a dispersion of droplets [4], which reduces interfacial tension and retards particle flocculation during mixing [3]. The molecules of surfactant have polar and non-polar parts which act as an intermediary to combine polar and non-polar polymers; the intermolecular interactions between the polar and the non-polar polymer segments resemble the macroscopic hydrocarbon-water interface [3,7,5].The idea of the emulsion dispersion inspired by emulsification of LNR, results obtained showed that the droplet size of emulsion of LNR with higher molecular weight is greater than that of the lower molecular weight [6]. Emulsion dispersion was able to produce homogeneous low density polyethylene (LDPE)/ liquid natural rubber (LNR) blends [3] and nylon-6/LNR blends, DSC thermogram indicated a single glass transition temperature, Tg and SEM images showed no phase separation between blend components [7]. |
Emulsions are thermodynamically unstable liquid/liquid dispersions that are stabilized, in general, by surfactants [1]. Surfactants are usually added to emulsion systems, assembling in the interface of the emulsion droplets, thus providing a protective membrane that prevents the droplets from flocculating or coalescing and thus enhancing the droplets formation and stability [2]. Emulsion dispersion is not about reactor blends for which one polymer is polymerized from its monomer in the presence of the other polymers; emulsion dispersion is a novel method of choice for the preparation of homogeneous blends of thermoplastic and elastomer [3]. The surfactant molecules adsorb on the surface of emulsion by creating a dispersion of droplets [4], which reduces interfacial tension and retards particle flocculation during mixing [3]. The molecules of surfactant have polar and non-polar parts which act as an intermediary to combine polar and non-polar polymers; the intermolecular interactions between the polar and the non-polar polymer segments resemble the macroscopic hydrocarbon-water interface [3,7,5].The idea of the emulsion dispersion inspired by emulsification of LNR, results obtained showed that the droplet size of emulsion of LNR with higher molecular weight is greater than that of the lower molecular weight [6]. Emulsion dispersion was able to produce homogeneous low density polyethylene (LDPE)/ liquid natural rubber (LNR) blends [3] and nylon-6/LNR blends, DSC thermogram indicated a single glass transition temperature, Tg and SEM images showed no phase separation between blend components [7]. |
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== Refrences == |
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1. Porras M, Martínez A, Solans C, González C, Gutiérrez JM |
1. Porras M, Martínez A, Solans C, González C, Gutiérrez JM |
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Revision as of 02:27, 9 December 2008
Emulsions are thermodynamically unstable liquid/liquid dispersions that are stabilized, in general, by surfactants [1]. Surfactants are usually added to emulsion systems, assembling in the interface of the emulsion droplets, thus providing a protective membrane that prevents the droplets from flocculating or coalescing and thus enhancing the droplets formation and stability [2]. Emulsion dispersion is not about reactor blends for which one polymer is polymerized from its monomer in the presence of the other polymers; emulsion dispersion is a novel method of choice for the preparation of homogeneous blends of thermoplastic and elastomer [3]. The surfactant molecules adsorb on the surface of emulsion by creating a dispersion of droplets [4], which reduces interfacial tension and retards particle flocculation during mixing [3]. The molecules of surfactant have polar and non-polar parts which act as an intermediary to combine polar and non-polar polymers; the intermolecular interactions between the polar and the non-polar polymer segments resemble the macroscopic hydrocarbon-water interface [3,7,5].The idea of the emulsion dispersion inspired by emulsification of LNR, results obtained showed that the droplet size of emulsion of LNR with higher molecular weight is greater than that of the lower molecular weight [6]. Emulsion dispersion was able to produce homogeneous low density polyethylene (LDPE)/ liquid natural rubber (LNR) blends [3] and nylon-6/LNR blends, DSC thermogram indicated a single glass transition temperature, Tg and SEM images showed no phase separation between blend components [7].
Refrences
1. Porras M, Martínez A, Solans C, González C, Gutiérrez JM (2005) Colloids surfaces a physicochem. Eng Aspects 270– 271:189. doi:10.1016/j.colsurfa.2005.06.018
2. Gao J, Wang S, Jiang Z, Lu H, Yang Y, Jing F et al (2006) J Mol Catal Chem 258:261. doi:10.1016/j.molcata.2006.05.058
3. Daik R, Lee CY (2007) Sains Malaysiana 36:183
4. Bianco H, Marmur A (1992) J Colloid Interface Sci 151:517. doi:10.1016/0021-9797(92)90499-C
5. Nagarajan R (1980) Chem Phys Lett 76:282. doi:10.1016/0009- 2614(80)87021-7
6. Daik R, Shahinas B, Ibrahim A (2007) Malaysian. Polym J 2:29
7. Ahmad Adlie Shamsuri, Rusli Daik, Ishak Ahmad and Mohd Hafizuddin Hj. Jumali (2008) Journal of Polymer Research doi:10.1007/s10965-008-9239-6