Thermoplastics or elastomers suspended in a liquid state by means of emulsifiers
Pristine nylon -6 (white) and nylon -6/LNR blends (yellow) films , prepared via emulsion dispersion technique.
An emulsion dispersion is thermoplastics or elastomers suspended in a liquid state by means of emulsifiers .
Preparation
Emulsions are thermodynamically unstable liquid/liquid dispersions that are stabilized.[1]
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 .[2] In emulsion dispersion system the preparation of well-fined polymers droplets may be acquired by the use of water as dispersing medium. The surfactant molecules adsorb on the surface of emulsion by creating a dispersion of droplets,[3] which reduces interfacial tension and retards particle flocculation during mixing.[2] 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.[2] [4] [5] The idea of the emulsion dispersion inspired by emulsification of liquid natural rubber (LNR) , from particle size analysis and optical microscopy results 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 )/LNR blends [2] and nylon 6 /LNR blends.[5] Results of differential scanning calorimetry (DSC) thermogram indicated a single glass transition temperature (Tg) showed that the blends were compatible and scanning electron microscopy (SEM) micrograph showed no phase separation between blend components. In addition, exfoliated HDPE /LNR/montmorillonite nanocomposites were successfully achieved by using emulsion dispersion technique as well.[7]
References
^ Gao, Jinbo; Wang, Shouguo; Jiang, Zongxuan; Lu, Hongying; Yang, Yongxing; Jing, Fei; Li, Can (2006). "Deep desulfurization from fuel oil via selective oxidation using an amphiphilic peroxotungsten catalyst assembled in emulsion droplets". Journal of Molecular Catalysis A: Chemical . 258 (1–2): 261–266. doi :10.1016/j.molcata.2006.05.058 .
^ a b c d Daik, Rusli; Ching, Yee Lee (2007). "Penyediaan Adunan LDPE/LNR Melalui Penyebaran Emulsi" . Sains Malaysiana . 36 (2): 183–8.
^ Bianco, Havazelet; Marmur, Abraham (1992). "The dependence of the surface tension of surfactant solutions on drop size". Journal of Colloid and Interface Science . 151 (2): 517–522. Bibcode :1992JCIS..151..517B . doi :10.1016/0021-9797(92)90499-C .
^ Nagarajan, R (1980). "Thermodtnamics of surfactant-polymer interactions in dilute aqueous solutions". Chemical Physics Letters . 76 (2): 282–286. Bibcode :1980CPL....76..282N . doi :10.1016/0009-2614(80)87021-7 .
^ a b Shamsuri, Ahmad Adlie; Daik, Rusli; Ahmad, Ishak; Jumali, Mohd Hafizuddin Hj (2008). "Nylon-6/liquid natural rubber blends prepared via emulsion dispersion". Journal of Polymer Research . 16 (4): 381–387. doi :10.1007/s10965-008-9239-6 . S2CID 136648878 .
^ Daik, Rusli; Bidol, Shahinas; Abdullah, Ibrahim (2007). "Effect of molecular weight on the droplet size and rheological properties of liquid natural rubber emulsion" . Malaysian Polymer Journal . 2 (1): 29–38. CiteSeerX 10.1.1.527.879 .
^ Srihanum, A.; Rusli, D.; Ibrahim, A. (2006). "Penyediaan nanokomposit polietilena berketumpatan tinggi, getah asli cecair dan tanah liat melalui kaedah penyebaran emulsi" [Preparation of high density polyethylene nanocomposites, liquefied natural gas and clay through emulsion dispersion]. Prosiding Kolokium Siswazah Ke-6, HLM (in Malay): 372–4. [verification needed ]
Further reading
Gasanov, B.M; Bulanov, N.V (2015). "Effect of the droplet size of an emulsion dispersion phase in nucleate boiling and emulsion boiling crisis". International Journal of Heat and Mass Transfer . 88 : 256–260. doi :10.1016/j.ijheatmasstransfer.2015.04.018 .