Sains Malaysiana 39(3)(2010): 435–439

Mechanical and Optical Properties of CaCO3 Lumen-Loaded Paper: Effect of Polyethylenimine and Alum

(Sifat Mekanik dan Optik Kertas CaCO3 Berpengisi Lumen: Kesan Polietilinimina dan Alum)

Rohaya Othman¹, Sarani Zakaria²*, Chin-Hua Chia², Ainun Zuriyati³ & Nasharuddin Isa¹

¹Pusat Penyelidikan Mineral, Jabatan Mineral dan Geosains Malaysia, Jalan Sultan Azlan Shah 3140 Ipoh, Perak, Malaysia

²Pusat Pengajian Fizik Gunaan, Universiti Kebangsaan Malaysia 43600 Bangi, Selangor, Malaysia

³Institut Perhutanan Tropika dan Produk Hutan (INTROP), Universiti Putra Malaysia, 43400, Serdang Selangor, Malaysia

Received: 22 July 2009 / Accepted: 9 September 2009

ABSTRACT

Precipitated calcium carbonate fillers were loaded into the lumen of bleached mixed tropical hardwood pulp using polyethylenimine (PEI) and alum. Our results indicated that the addition of (PEI) increased the degree of loading of precipitated calcium carbonate (PCC) into the lumen of fibers. The degree of loading also increased with the addition of alum together with PEI. The mechanical strengths of the produced lumen loaded paper increased with the addition of PEI and alum. Meanwhile the mechanical strength without alum had slightly increased the mechanical strengths of the paper. Electron micrographs revealed that the PCC fillers were successfully loaded into the lumen of the fibers.

Keywords: Lumen loading; mechanical properties; optical properties; recipitated calcium carbonate; polyethylenimine

ABSTRAK

Pengisi kalsium karbonat termendak dimasukkan ke dalam lumen pulpa terluntur tropika campuran dengan menggunakan polietilinimina (PEI) dan alum. Keputusan menunjukkan pertambahan PEI telah meningkatkan darjah pemasukan kalsium karbonat termendak (PCC) ke dalam lumen fiber. Darjah pemasukan lumen ini juga meningkat apabila PEI dan alum digunakan serentak. Kekuatan mekanik kertas berpengisi lumen meningkat bagi kertas yang dihasilkan menggunakan PEI bersama alum. Namun tanpa penggunaan alum, kekuatan mekanik kertas mengalami sedikit peningkatan sahaja. Mikrograf menunjukkan pengisi PCC berjaya dimasukkan ke dalam lumen fiber.

Kata kunci: Kalsium karbonat termendak; pemasukan lumen; polietilinimina; sifat mekanik; sifat optik 

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*Corresponding author; email: sarani@ukm.my