Sains Malaysiana 40(7)(2011): 719–724
Influence of Compounding Methods
on Poly(vinyl) Alcohol/Sago Pith Waste Biocomposites: Mechanical and Water
Absorption Properties
(Kesan
Kaedah Pencampuran ke atas Biokomposit Polivinil Alkohol/Bahan
Buangan
Empulur Sagu: Sifat-sifat Mekanik dan Penyerapan Air)
W.Y. Toh*, J.C. Lai
& W.A.R. Wan Aizan
Faculty of Chemical and Natural Resources Engineering,
Universiti Teknologi Malaysia
81310 UTM Skudai, Johor, Malaysia
Diserahkan: 23 Oktober 2009 / Diterima: 4 Ogos 2010
ABSTRACT
Several
methods of incorporating sago pith waste (SPW)
into poly(vinyl alcohol) (PVA) had been conducted: (i) dry
blending (PVA/SPW/G), (ii) blending of SPW and
pre-plasticized PVA (pPVA/SPW/G)
and (iii) blending of pre-plasticized of both PVA and SPW (pPVA/pSPW). The effect of the compounding method on the
mechanical and water absorption properties were investigated. The addition of SPW into PVA greatly reduced the tensile strength and elongation at break. The
tensile strength and elongation at break of PVA/SPW composites
with identical geometry during compounding stage (powder/powder and
pellet/pellet), which were PVA/SPW/G
and pPVA/pSPW yielded the highest value. The percentage of water absorbed by PVA/SPW/G
(without pre-plasticization) was the highest, followed by pPVA/pSPW and pPVA/SPW/G.
Keywords:
Mechanical properties; polyvinyl alcohol; sago pith waste; water absorption
ABSTRAK
Beberapa
cara untuk mengadunkan bahan buangan empulur sagu (SPW)
ke polivinil alkohol (PVA) telah dilakukan: i) pengadunan
secara kering (PVA/SPW/G),
(ii) pengadunan SPW dan pra-pemplastikan PVA (pPVA/SPW/G)
dan (iii) pengadunan pra-pemplastikan SPW dan pra-pemplastikan PVA (pSPW/pPVA).
Kesan kaedah pengadunan ke atas sifat-sifat mekanik dan penyerapan air telah
dikaji. Penambahan SPW ke dalam PVA banyak
mengurangkan tegasan tegangan dan terikan pada patah. Tegasan tegangan dan
terikan pada patah bagi komposit PVA/SPW dengan
geometri yang serupa (tepung/tepung dan resin/resin) semasa peringkat
pengadunan, iaitu PVA/SPW/G
dan pPVA/pSPW menghasilkan nilai tertinggi. Peratus air diserap oleh PVA/SPW/G
(tanpa pra-pemplastikan) adalah tertinggi, ini diikuti oleh pPVA/pSPW dan pPVA/SPW/G.
Kata kunci: Alkohol
polivinil; bahan buangan empulur sagu; penyerapan air; sifat mekanik
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*Pengarang untuk surat-menyurat; email:
tohwenyee@yahoo.co.uk
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