Sains Malaysiana 39(3)(2010): 441–444

Effect of Mixed Tropical Hardwood Kraft Pulp and Polyacrylamide Types on Magnetite Retention in Lumen Loaded Handsheets

(Kesan Pulpa Kayu Keras Tropika Campuran dan Poliakrilamida Terhadap Retensi Magnetit dalam Kertas Makmal Lumen Berpengisi)

Ainun Zuriyati Mohamed*

Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry & Forest Products (INTROP) Universiti Putra Malaysia 43400 UPM, Serdang, Selangor D.E., Malaysia

Sarani Zakaria, Roslinda Shamsuddin & Mustaffa Abdullah

Materials Science Programme, School of Applied Physics, Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi, Selangor D. E., Malaysia

Received: 28 March 2008 / Accepted: 22 December 2009

ABSTRACT

This paper reports on the preparation of magnetic lumen loaded handsheets from bleached and unbleached mixed tropical hardwood kraft pulps. The lumen coating technique is a physical approach whereby fillers were deposited inside the fibre lumen. In order to produce magnetically responsive fibres, magnetic fillers were loaded into the fibre lumen. The magnetic filler chosen was magnetite which is usually used to make mylar as found in a diskette. Low and high molecular weights of polyacrylamide (PAM) were used as retention aids. The effect of different molecular weight of PAM on filler content in the bleached and unbleached handsheets were studied. The results showed that the amount of fillers deposited in the pulp fibres increased with increasing molecular weight of PAM using both pulps. However the bleached pulps gave better lumen loading than the unbleached when using high molecular weight of PAM.

Keywords: Lumen loading technique; magnetite; magnetic paper; polyacrylamide

ABSTRAK

Kajian ini menumpukan kepada penyediaan kertas makmal lumen berpengisi magnet daripada pulpa terluntur dan tidak terluntur kayu keras tropika campuran. Bagi menghasilkan kertas magnet yang berfungsi, partikel magnet dimasukkan ke dalam lumen gentian. Partikel magnet yang dipilih adalah magnetit, yang banyak digunakan dalam pembuatan mylar di dalam disket. Poliakrilamida (PAM) dengan berat molekul rendah hingga tinggi digunakan sebagai agen retensi. Kesan penggunaan PAM dengan berat molekul yang berbeza ini ke atas kemasukan partikel magnet dikaji. Keputusan menunjukkan kandungan pengisi yang dimasukkan ke dalam gentian lumen bertambah dengan pertambahan berat molekul PAM bagi kedua-dua jenis pulpa. Walau bagaimanapun, pulpa terluntur memberikan hasil yang lebih baik berbanding pulpa tidak terluntur bila PAM dengan berat molekul tinggi digunakan.

Kata kunci: Kertas magnet; magnetit; poliakrilamida; teknik pemasukan lumen 

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*Corresponding author; email: ainun.introp@gmail