Scholarly article on topic 'Preparation of Poly (methyl methacrylate) Microcapsule with Encapsulated Jasmine Oil'

Preparation of Poly (methyl methacrylate) Microcapsule with Encapsulated Jasmine Oil Academic research paper on "Materials engineering"

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{"Polymethyl methacrylate" / "Jasmine oil" / Microcapsule / "Solvent evaporation"}

Abstract of research paper on Materials engineering, author of scientific article — Paweena Teeka, Amorn Chaiyasat, Preeyaporn Chaiyasat

Abstract The microencapsulation of jasmine oil with polymethyl methacrylate (PMMA) was carried out by solvent evaporation method in oil in water (O/W) emulsion system. The oil phase was formed by the mixing of PMMA, jasmine oil and toluene and then dispersed in polyvinyl alcohol solution as stabilizer. After solvent evaporation, PMMA microcapsules with encapsulated jasmine oil were formed. The influence of weight ratio of PMMA:jasmine oil on the preparation of polymer capsule was studied. It was found that using 1:1 weight ratio of PMMA:jasmine oil, the polymer capsules could not prepared. The increase of PMMA content resulting in the formation of spherical PMMA microcapsules as in the case of 2:1 and 3:1 weight ratios. The amount of encapsulated jasmine oil and the encapsulation efficiency was measured with UV-visible spectroscopy. Approximately 72% encapsulation efficiency was obtained.

Academic research paper on topic "Preparation of Poly (methyl methacrylate) Microcapsule with Encapsulated Jasmine Oil"

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Energy Procedia 56 (2014) 181 - 186

11th Eco-Energy and Materials Science and Engineering (11th EMSES)

Preparation of Poly (methyl methacrylate) microcapsule with encapsulated Jasmine oil

Paweena Teeka, Amorn Chaiyasat, Preeyaporn Chaiyasat*

Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Klong 6, Thanyaburi,

Pathumthani 12110, Thailand

Abstract

The microencapsulation of jasmine oil with polymethyl methacrylate (PMMA) was carried out by solvent evaporation method in oil in water (O/W) emulsion system. The oil phase was formed by the mixing of PMMA, jasmine oil and toluene and then dispersed in polyvinyl alcohol solution as stabilizer. After solvent evaporation, PMMA microcapsules with encapsulated jasmine oil were formed. The influence of weight ratio of PMMA:jasmine oil on the preparation of polymer capsule was studied. It was found that using 1:1 weight ratio of PMMA jasmine oil, the polymer capsules could not prepared. The increase of PMMA content resulting in the formation of spherical PMMA microcapsules as in the case of 2:1 and 3:1 weight ratios. The amount of encapsulated jasmine oil and the encapsulation efficiency was measured with UV-visible spectroscopy. Approximately 72% encapsulation efficiency was obtained.

© 2014ElsevierLtd.Thisis anopen accessarticleunder the CC BY-NC-ND license (http://creativecommons.Org/licenses/by-nc-nd/3.0/).

Peer-review under responsibility of COE of Sustainalble Energy System, Rajamangala University of Technology Thanyaburi (RMUTT)

Keywords: Polymethyl methacrylate; Jasmine oil; Microcapsule; Solvent evaporation

* Corresponding author. Tel.: +66-2549-3536; fax: + 66-2549-3521. E-mail address:p_chaiyasat@mail.rmutt.ac.th

1876-6102 © 2014 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

Peer-review under responsibility of COE of Sustainalble Energy System, Rajamangala University of Technology Thanyaburi (RMUTT) doi: 10.1016/j.egypro.2014.07.147

1. Introduction

Essential oils are organic compounds which are naturally produced by plants in several parts such as flower, leaf and trunk. There are two types of main ingredients those are terpens and phenyl propanoid [1]. Essential oils have different properties depending on the type of plants being extracted from such as Lavender oil extracted from Lavender flower. Its properties are to relax body and minds. Jasmine oil is extracted from Jasmine flower showing fresh clean and perky properties.

However, the direct utilization of essential oils is limited because of their high volatile rate. To overcome this drawback, the encapsulation of them with polymer is studies. By the encapsulation, the volatile rate of oils is reduced and controlled. Moreover, the essential oils are protected from light, air and heat [2]. The selection of polymer shell depends on the application of the polymer capsule. For example, for food industry [3], biodegradable and biocompatible polymer as polylactic acid [4] and poly-e-carpolactone [5] are used. In the textile industry for fabric coating [6, 7], the high strength polymer shell such as polymethyl methacrylate (PMMA) and polystyrene are selected to prevent the capsule broken during coating process.

Many methods have been used for the preparation of polymer capsule such as interfacial polymerization [8], phase inversion precipitation [9, 10] in-situ polymerization [11] and solvent evaporation [12]. Among of them, solvent evaporation is one of the most famous methods due to its simplicity.

Therefore, in this research, the preparation of PMMA microencapsulated jasmine oil was carried out by simple solvent evaporation method in oil in water (O/W) emulsion. The influence of PMMA:jasmine oil weight ratio was studied.

2. Experiment

2.1 Materials

PMMA (Scimile, Co., Ltd; Thailand) was used as a polymer shell. Jasmine oil (Hong haut Co., Ltd; Thailand; purity 99%) was used as capsule core. Poly(vinyl alcohol) (PVA; Aldrich, USA; degree of saponification, 87-90%) was used as received for stabilizer. Toluene (RCI Labscan; Thailand; Assay purity 99.5%) was used as solvent

2.2 Preparation of PMMA microcapsule with encapsulated jasmine oil

In this study, PMMA capsules were prepared by solvent evaporation method in O/W emulsion system as follows. PMMA was firstly dissolved in toluene and then mixed with jasmine oil as a homogeneous solution under the conditions listed in Table1. It was subsequently poured into 1 % wt PVA aqueous solution and stirred at 800 rpm for 30 min to form the oil droplets. After the evaporation of toluene, PMMA microcapsules encapsulated jasmine oil were obtained. Finally, they were centrifuged at 5,000 rpm for 10 min and dried overnight in vacuum oven. The amount of the encapsulated jasmine oil and the encapsulation efficiency were measured with UV-visible spectroscopy.

2.3 Characterization of PMMA microcapsules

The sized and shape of oil droplets in emulsion were observed with optical microscope (OM; SK-100EB & SK-100 ET, Seek Inter Corporation Ltd., Thailand). The morphology of the polymer capsules was observed with scanning electron microscope (SEM; JSM-6510, Jeol, Jeol Ltd., Japan) after coating with gold. The amount of encapsulated jasmine oil was measured by UV-visible spectrometer (UV 1601, Shimadzu, USA). Approximately 20 mg of dried polymer capsules were dissolved in THF and adjusted the total volume to 10 g. The jasmine oil amount inside polymer capsules was determined at Xmax 264 nm. To determined jasmine oil concentration, the measured absorbance of encapsulated jasmine oil solution was compared with standard curve of jasmine oil standard solution at 300, 400, 500 and 600 ppm. The encapsulation efficiency was calculated using the following equation

A= (B/C) x 100

Where A = the % encapsulation, B = gram of jasmine oil in the dried PMMA capsules obtained from the UV-visible spectroscopy and C = gram of jasmine oil in the dried PMMA capsules obtained from recipes.

PMMA microcapsule

Fig.1. Schematic diagram of the preparation of PMMA microcapsules with encapsulated jasmine oil by solvent evaporation method in O/W system

Table 1. Recipes for the preparation of PMMA capsules containing jasmine oil by the solvent evaporation method

Ingredients PC:Jasmine oil

1:1 2:1 3:1

PMMA (g) 2.50 3.40 3.75

Jasmine oil (g) 2.50 1.60 1.25

PVA solution 1% wt. (ml) 45.00 45.00 45.00

Toluene (g) 10.00 10.00 10.00

3. Results and Discussion

3.1 The effect of weight ratio of PMMA:Jasmine oil

PMMA/jasmine oil microcapsules were prepared in O/W emulsion system by the solvent evaporation method at 1:1, 2:1 and 3:1 weight ratios of PMMA:jasmine oil. The emulsions with high colloidal stability were obtained in all cases as shown in Fig. 2(a-c). The spherical oil droplets with broad particle size distribution were observed as shown in Fig. 4(a-c).

After solvent evaporation, phase separation of PMMA chains and jasmine oil was taken place. The capsules became dark as shown in Fig. 4(a,-c,). Because PMMA is hydrophilic polymer, it is easily to move to the droplet interface forming PMMA shell encapsulated jasmine oil as a core [12]. The hard surface of the prepared microcapsules as shown in Fig. 3(a-c) confirmed our assumption that PMMA shell was formed. In the case of 1:1 weight ratio, the spherical microcapsules with holes were found. It may be due to the utilization of less amount of PMMA which is not enough to completely envelope jasmine oil. In contrast, the smooth outer surface microcapsules were obtained using 2:1 and 3:1 weight ratios of PMMA:jasmine oil. However, 2:1 weight ratio was selected because of higher jasmine oil content. To confirmed the formation of PMMA:jasmine oil microcapsule, the encapsulated oil content was measured.

Fig. 2. Photos of PMMA emulsions prepared by solvent evaporation method in O/W system at various PMMA:jasmine oil (° ow/w): a) 1:1; b) 2:1 and c) 3:1

3.2 The amount of encapsulated jasmine oil

The encapsulated jasmine oil amount was measured with UV-visible spectrophotometer at Xmax 264 nm. The UV-visible spectra of jasmine oil standard solution, PMMA solution and jasmine oil in PMMA capsules were shown in Fig. 5. The amount of encapsulated jasmine oil was determined compared with the standard curve. The method validation showed 83% recovery and 0.11% RSD of 500 mg/l standard solution. Using 20 mg dried capsules, 4.78 mg of jasmine oil was found corresponding with 72% encapsulation efficiency.

D nl»' •XiL. H Q 1 A < Y > 4 - —- A i

¡3 V. I 10 urn ] IBS [ 107m |

Fig. 3. SEM micrographs of PMMA microcapsules at various PMMA:jasmine oil (%w/w): a) 1:1; b) 2:1 and c) 3:1

Fig. 4. The optical micrographs of PMMA/jasmine oil droplets before (a, b and c) and after toluene evaporation (a^ b and c^ at various ratios of PMMA:jasmine oil (%w/w): (a, a) 1:1; (b, bO 2:1 and (c, c} 3:1

Fig. 5. UV-visible spectra of Jasmine oil solution;_PMMA: jasmine oil capsule and_PMMA solution

4. Conclusions

The microencapsulation of jasmine oil with PMMA shell was successfully prepared in O/W emulsion system using solvent evaporation method. It was found that using PMMA:jasmine oil of 2:1, the spherical microcapsules with smooth outer surface and high oil content were obtained. The encapsulation efficiency was 72% which confirm the successful encapsulation.

References

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