Preparation of polyurethane nanocapsules by miniemulsion polyaddition

Johnsen, Heidi; Schmid, Ruth

doi:10.1080/02652040701585179

Cited by 42 publications

(31 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Study on polyurethane microcapsules by Frere et al (1998) shows that diameter of microcapsules increases as temperature is increased, but mechanical resistance decreases with increase of diameter. It was observed that different types of surfactants and variation in pH and ionic strength of the continuous phase affected the diameter of the mini-emulsion droplets and the resulting microcapsules (Johnsen and Schmid, 2007).…”

Section: -Severalmentioning

confidence: 99%

Characterisation and applications of microcapsules obtained by interfacial polycondensation

Zhang

Rochefort

2012

Journal of Microencapsulation

View full text Add to dashboard Cite

This review highlights the materials, mechanisms and applications of microencapsulation by interfacial polycondensation in different areas. This technology entraps active ingredients inside microcapsules/microspheres, having an average diameter ranging from nanosize to several 100 µ. Polycondensation reactions take place at the boundary of two phases to form the shells of microcapsules or matrix microspheres. The emulsion can be classified into three types: water-in-oil, oil-in-water and oil-in-oil. According to the hydrophilic-lipophilic property of core phase, different active substances, such as proteins, enzymes, insecticides, herbicides, vitamins, catalysts, drugs, essential oils, dyes and phase change materials, have been successfully incorporated into different microcapsules/microspheres. Based on the shell-forming materials, this technology is capable of preparing polyamine, polyurea, polyurethane, polythiourea, polyester, polyepoxide, polyacrylamide and polysiloxane microcapsules. Over the past two decades, microcapsules prepared by interfacial polycondensation have been widely used in carbonless paper, cosmetics, pharmacy, agriculture, energy storage/transfer, thermal insulation/regulation and information and magnetic recording.

show abstract

Section: -Severalmentioning

confidence: 99%

Characterisation and applications of microcapsules obtained by interfacial polycondensation

Zhang

Rochefort

2012

Journal of Microencapsulation

View full text Add to dashboard Cite

show abstract

“…• The encapsulation of organic liquids in PUR nanocapsules prepared by interfacial miniemulsion polycondensation of isophorone diisocyanate and propanetriol has also been reported [52] . Encapsulation effi ciency was found to be dependent on the water solubility, interfacial tension against water, and compatibility with PUR of the liquids.…”

Section: Drug Delivery Systemsmentioning

confidence: 99%

Biodegradable Polyurethanes and Poly(ester amide)s

Rodríguez‐Galán

Franco

Puiggalı́

2011

Handbook of Biodegradable Polymers

View full text Add to dashboard Cite

AbbreviationsBDI 1,4 -buthylenediisocyanate BDO 1,4 -butanediol DSC differential scanning calorimetry DMSO dimethyl sulfoxide DMPA dimethylol propionic acid DUD diurethanediol DMTA dynamic mechanical thermal analysis EM electron microscopy ED ethylene diamine H12MDI dicyclohexylmethane diisocyanate HS hard segment HDI 1,6 -hexamethylene diisocyanate IR infrared spectroscopy IPDI isophorone diisocyanate LDI lysin methyl ester diisocyanate MDI diphenylmethane diisocyanate NMR nuclear magnetic resonance PCL polycaprolactone PCUs polycarbonate -based polyurethanes PDA propanediamine PDMO poly(decamethylene glycol) PEAs poly(ester amide)s PEEA poly(ether ester amide) PEO poly(ethylene glycol) PEUs polyester -based polyurethanes PHMO poly(hexamethylene glycol) POMO poly(octamethylene glycol) PTMO polytetramethylene oxide glycol PURs polyurethanes SAXS small -angle X -ray scattering

show abstract

“…Nanocapsules have a polymeric shell and an inner liquid core. In this case, the active substances are usually dissolved in the inner core, but may also be adsorbed to their surface (Limayem et al 2004;Johnsen and Schmid 2007;Letchford and Burt 2007;Moinard-Che´cot et al 2008). …”

Section: Introductionmentioning

confidence: 98%

Development of a novel nanocapsule formulation by emulsion-diffusion combined with high hydrostatic pressure

Mi-Yeon

Min

Bourgeois

et al. 2008

Journal of Microencapsulation

View full text Add to dashboard Cite

A common method used to prepare polymeric nanoparticles in pharmaceutical technology is emulsion-diffusion. However, this method has several disadvantages due to the long duration of the process. At the diffusion step of conventional emulsion-diffusion, high pressure treatment could replace the addition of great quantities of water resulting in diffusion of the solvents from the internal phase to the external phase. The objective of the present study was to develop a novel method for nanoparticle formulation by combining high pressure treatment with the emulsion-diffusion method to avoid an additional diffusion step in the aqueous phase. After emulsification at 11 000 rpm, the emulsions were pressurized at 100, 200 and 300 Mpa, each for 300, 600, 900 or 1200 s. The mean size and morphology of the nanoparticles were analysed by Mastersizer Õ , TEM and SEM. The mean size of pressurized emulsion nanoparticles was the same at 100 MPa for holding times up to 600 s. Also, the pressurized emulsion nanoparticle size increased and the peak and width of the size distribution curve was higher and slightly narrower depending on the pressure and the holding time. This study shows that pressure treatment can produce polymer membranes surrounding the oil surface owing to the precipitation of PCL, inducing the diffusion of solvent from the interior to the exterior based on TEM images. From these results, it is believed that high pressure treatment should be considered as a successful alternative for preparing nanoparticles.

show abstract

Preparation of polyurethane nanocapsules by miniemulsion polyaddition

Cited by 42 publications

References 31 publications

Characterisation and applications of microcapsules obtained by interfacial polycondensation

Characterisation and applications of microcapsules obtained by interfacial polycondensation

Biodegradable Polyurethanes and Poly(ester amide)s

Development of a novel nanocapsule formulation by emulsion-diffusion combined with high hydrostatic pressure

Contact Info

Product

Resources

About