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Effect of Pro-Degradant Additive on Photo-Oxidative
Aging of Polypropylene Film
(Pengaruh Aditif Pro-degradasi
pada Penuaan Foto-Oksidatif Filem Polipropilina)
Noor Zalikha Mohamed Islam, Nadras Othman, Zulkifli Ahmad
& Hanafi Ismail
School of Materials and Mineral
Resources Engineering, USM Engineering Campus
Universiti Sains Malaysia, 14300 Nibong
Tebal, Penang, Malaysia
Diserahkan: 23 Oktober 2009 / Diterima: 20 September 2010
ABSTRACT
This
paper describes the effect of pro-degradant additives (PDA)
on photo-oxidative aging of polypropylene (PP)
films after being time accelerated in UV-weathering chamber. Thin
films (0.12 mm) containing these additives were prepared by sheeting process.
The effect of UV on PP films in the presence of
these additives was investigated. Changes in the PP films
appearance, tensile properties and carbonyl index (CI)
were used to investigate the degradation behavior. The films became completely
pulverised after 100 h of photo-oxidative treatment and could not be tested
further. Films containing PDA showed rapid loss in tensile
properties within 100 h of photo-oxidative aging. In addition, the CI results
of photo-oxidative films increased with increasing PDA amount
within the time interval of aging and the activity was due to the mechanism
reaction of PP with PDA particles. During the aging
process the material becomes denser due to tighter packing and incorporation of
oxygen into the amorphous regions of the polymer. The results indicated that
the presence of PDA contributed to the photo
degradation and the activity was very much influenced by the amount PDA.
Keywords:
Degradable polypropylene; photo-oxidative aging; pro-degradant additives
ABSTRAK
Makalah
ini menghuraikan tentang pengaruh aditif pro-degradasi (PDA)
terhadap penuaan filem foto-oksidatif polipropilina (PP)
selepas dipercepat penuaannya dalam kebuk cuaca-UV.
Filem nipis (0.12 mm) yang mengandungi aditif ini disediakan melalui proses
penipisan helaian. Pengaruh UV pada filem polipropilina
dengan kehadiran aditif tersebut telah diselidiki. Perubahan terhadap rupa
polipropolina filem, sifat-sifat terikan dan indeks karbonil (CI)
telah digunakan untuk mengkaji perilaku degradasi. Filem-filem ini menjadi
serbuk secara keseluruhan selepas 100 jam perawatan foto-oksidatif dan tidak
boleh diuji dengan lebih lanjut lagi. Filem yang mengandungi PDA telah
menunjukkan kemerosotan ketara dalam 100 jam penuaan foto-oksidatif. Selain
daripada itu, keputusan CI filem foto-oksidatif telah
meningkat dengan bertambahnya jumlah PDA dalam tempoh waktu penuaan
dan aktiviti itu berlaku kerana reaksi mekanisme PP dengan
partikel PDA. Semasa proses penuaan, bahan menjadi lebih tumpat
kerana pembungkusan lebih ketat dan gandingan oksigen ke dalam kawasan amorfus
polimer. Keputusan kajian menunjukkan bahawa PDA menyumbang
kepada degradasi foto-oksidatif dan aktiviti sangat dipengaruhi oleh jumlah PDA.
Kata kunci: Aditif pro-degradasi; penuaan foto-oksidatif ;
polipropilina terdegradasi
RUJUKAN
Alauddin, M., Choudkury, I.A., Baradie, M.A. & Hashmi, M.S.J.
1995. Plastics and their machining: A review. Materials Processsing Technology. Journal of Materials Processing Technology 54: 40-46.
Anon.
2010. Protecting the Environmental through Oxo-Biodegradable Plastic.,
Oxo-biodegradable Plastic Association. www.biodeg.org (13 July 2010)
Avella, M., Bonadies, E., Martuscelli, E. & Rimedio, R. 2001.
European current standardization for plastic packaging recoverable through
composting and biodegradation. Polymer Testing 20: 517-521.
Bikaris, D., Prinos, J., Perrier, C. & Panayiotou, C. 1997.
Thermoanalytical study on the effect of EAA and starch on the thermooxidative
degradation of LLDPE. Polymer Degradation and Stability 57: 313-324.
Chiellini, E., Corti, E. & Swift, G. 2003. Biodegradation of
thermally oxidised, fragmented low density polyethylenes. Polymer
Degradation and Stability 81: 341-351.
Doty, L.F. 2005. Oxo-biodegradable Plastics Institute ‘A Brief
Overview of Degradable Plastics. London: Chapman and Hall.
Grant, M.H. 1991. Encyclopedia of Chemical Technology Vol.
8, New York: Wiley.
Guillet, J. In., Gilead, D. & Scott, G. Editors 1995. Degradable
Polymers Principles & Applications, London: Chapman & Hall.
Mohamed Islam, N., Othman, N., Ismail, H. & Ahmad, Z. 2010.
Effect of pro-degradant additives concentration on aging properties of
polypropylene films. Polymer Plastic Technology and Engineering 49: 1-7.
Nils, B.V. & Kleppe, E.A. 2009. Oxo-biodegradable polyolefins
show continued and increased thermal oxidative degradation after exposure to
light. Polymer Degradation and Stability 94: 659-663.
Osawa, A. 1998. Role of metals deactivators in polymer
degradation. Polymer Degradation and Stability, 20: 203-236.
Osawa, Z., Kurisu, N., Nagashima, K. & Nankano, K. 1979. The
effect on trasition metal stearate on the phodegradation of polyethylene, Journal
Applied Polymer Science 23: 3583-3590.
Roy, P.K., Surekha, P., Rajagopal, C., Chatterjee, S.N. &
Choudhary, V. 2006. Study on the degradation of Ldpe in the presence of cobalt
stearate and benzyl. Application Polymer Science 99: 236-43.
Roy,
P.K., Surekhaa, P., Rajagopal, C., Titus, S. & Deshmukh, C. 2008.
Degradation of abiotically aged LDPEfilms containing pro-oxidant by bacrerial
consurtium. Polymer Degradation and Stability 92: 1917-1922.
Sudhakar, M.,
Trishul, A., Mukesh Doble, Suresh Kumar, K., Syed Jahan, S., Inbakandan, D.,
Viduthalai, D.D., Umadevi, V.R., Sriyutha, P., Murthy, R. & Venkatesan
2007. Biofulling and biodegradation of polyolefins in ocean waters. Polymer
Degradation and Stability 92: 1743-1752.
*Pengarang untuk surat-menyurat; email: srnadras@eng.usm.my
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