Malaysian Journal of Analytical Sciences Vol 20 No 5 (2016): 1123 - 1128

DOI: http://dx.doi.org/10.17576/mjas-2016-2005-18

 

 

 

LATEX PARTICLES MORPHOLOGY OF EPOXIDISED AND HIGH AMMONIA NATURAL RUBBER LATEX FROM ELECTRON MICROSCOPY TECHNIQUES

 

(Morfologi Partikel Lateks Bagi Lateks Getah Asli Terepoksi dan Lateks Getah Asli Kandungan Tinggi Ammonia daripada Teknik-Teknik Mikroskopi Elektron)

 

Norhanifah Mohd Yazid*, Fatimah Rubaizah Mohd Rasdi, Asrul Mustafa

 

Technology and Engineering Division,

Malaysian Rubber Board, 47000 Sungai Buloh, Selangor, Malaysia

 

*Corresponding author: norhanifah@lgm.gov.my

 

 

Received: 10 June 2015; Accepted: 21 July 2016

 

 

Abstract

The rubber latex particle morphology, size and also arrangements of various types of natural rubber latex are investigated in the latex state using Environmental Scanning Microscope (ESEM). Subsequently the changes in the morphology after film formation is observed using Field Emission Scanning Electron Microscopy (FESEM). Prior to film formation, in the latex state, epoxidised natural rubber showed marked differences in latex particle morphology and arrangement compared to high ammonia latex. Subsequently, after the films are formed, the microscopy results exhibited certain dissimilarities between high ammonia and epoxidised natural rubber latex films particularly particle clustering. It is revealed that the high ammonia natural rubber latex film showed distinctly larger spherical shaped latex particles at the surface of the films in contrast to the smaller latex particles as observed in the epoxidised natural rubber latex film. The present study provides insight into the differences in the film formation between high ammonia and epoxidised natural rubber latex, which may also influence the properties of the resulting rubber latex films and latex products.

 

Keywords:  high ammonia natural rubber latex, epoxidised natural rubber latex, film formation, latex particles

 

Abstrak

Morfologi partikel lateks getah, saiz dan juga susunan pelbagai jenis lateks getah asli dicirikan dalam bentuk lateks menggunakan Mikroskop Imbasan Alam Sekitar (ESEM). Selepas itu perubahan morfologi selepas pembentukan filem diperhatikan menggunakan Mikroskop Elektron  Imbasan  Medan (FESEM). Sebelum pembentukan filem, dalam bentuk lateks, getah asli terepoksi menunjukkan perbezaan yang ketara dalam morfologi partikel lateks dan susunan berbanding lateks getah asli ammonia kandungan tinggi. Selepas itu, setelah filem terbentuk, analisis mikroskop menunjukkan ketidaksamaan tertentu antara filem lateks getah asli kandungan tinggi ammonia dan lateks getah asli terepoksi terutamanya kelompok partikel. Ia mendedahkan bahawa filem bagi lateks getah asli kandungan tinggi ammonia menunjukkan partikel lateks berbentuk sfera jelas lebih besar di permukaan filem berbeza dengan partikel lateks yang lebih kecil sebagaimana yang berlaku di filem lateks getah asli terepoksi. Kajian ini memberi gambaran tentang perbezaan dalam pembentukan filem di antara lateks getah asli kandungan tinggi ammonia dan lateks getah asli terepoksi, yang juga boleh mempengaruhi sifat – sifat yang terhasil filem lateks getah dan produk getah.

 

Kata kunci: lateks getah asli kandungan tinggi ammonia, lateks getah asli terepoksi, pembentukan filem, partikel lateks

 

References

1.       Yoksan, R. (2008). Epoxidized natural rubber for adhesive applications. Kasetstart Journal (Natural Science), 43: 325 – 332.

2.       Gelling, I. R. (1988). Chemistry, structure and properties epoxidised natural rubber. International Rubber Technology Conference: 415 – 427.

3.       Le Bras, J. and Delalande. A. (1950). Derives Chimiques du Caouchouc Naturel, Paris, Dunod.

4.       Fatimah Rubaizah, M. R, Ngeow, Y. W., Zairossani, M. N. and Md. Aris, A. (2008). ENR-37.5 as a new epoxidised natural rubber (ENR) grade. International Rubber Conference & Exhibition: 1 – 11.

5.       Pummerer, R. and Burkard, P. A. (1922). On rubber. Ber, 55:  3458 – 3472. 

6.       Baker, C. S. L., Gelling, I. R. and Azemi, S. (1986). Epoxidised natural rubber. Journal of Natural Rubber Research, 1(2): 135 – 144.

7.       Yong, K. C., Foot, P. J. S., Morgan, H., Cook, S., Tinker, A. J. and Md Aris, A. (2008). Electrically conductive epoxidised natural rubber-polyaniline dodecylbenzenesulfonate blends prepared by solution mixing. Journal of Rubber Research, 11(2): 59 – 77.

8.       Haidzir, A. R., Gelling, I. R. and Freakley, P. K. (1994). Influence of phase morphology on the properties of natural rubber and epoxidised natural rubber blends. Journal of Natural Rubber Research, 9(4): 213 – 225.

9.       Suhawati, I., Ismaliza I., Kamarudin A. M. and Shamsul, K. (2013). Sound absorption analysis of foamed rubber composites from kenaf and calcium carbonate.  Journal of Rubber Research, 16(1): 36 – 44.

10.    Dayang Habibah, A. I. H., Shamsul Bahri, A. R. and Nik Intan, N. I. (2013). Morphology, physical and flame retardant properties of epoxidised natural rubber (ENR) organoclay compound. Journal of Rubber Research, 16(2): 91 – 100.

11.    Van Den Tempel, M. (1952). Electron microscopy of rubber globules in Hevea latex. Transaction of the Institution of the rubber industry, 28 (6): 303 – 309.

12.    Gomez, J. B. and Hamzah, S. (1989). Particle size distribution in Hevea latex — Some observations on the electron microscopic method. Journal of Natural Rubber Research, 4(3): 204 – 211.

13.    Southorn, W. A. (1960). Complex particles in Hevea latex.  Nature, 188: 165 – 166.

14.    Hauser, E. A. (1946). The morphology of rubber latex particles. A critical review. India Rubber World, 112(4): 461 – 463.

15.    Gorton, A. D. T and Pendle, T. D. (1983). Particle size measurement of rubber latices. Rubber Chemistry and Technology, 56: 664 – 676.

16.    Gazaley, K. F., Gorton, A. D. T. and Pendle, T. D. (1988). In latex concentrate: Properties and composition, Roberts, A.D (ed), Rubber Science and Technology, Chapter 3. Oxford University Press:  63 – 90.

17.    Pendle, T. D. and Swinyard, P. E. (1991). The particle size of natural rubber latex concentrates by photon correlation spectroscopy.  Journal of Natural Rubber Research 6 (1): 1 – 11.

18.    Keddie, J. L. and Routh, A. F. (2010). In Fundamental of latex film formation; Process and properties. Parch, H. Chapter 1. Springer: 10 – 18.