Ramarad, Suganti
(2008)
Preparation And Properties Of Kenaf Bast Fiber
Filled (Plasticized) Poly(Lactic Acid) Composites.
Masters thesis, Universiti Sains Malaysia.
Abstract
Komposit poli(Iaktik asid) diplastik (p-PLA) terisi gentian kayu kenaf (KBF)
telah disediakan dan dikaji secara berperingkat. Pertamanya, poli(Iaktik asid) (PLA)
telah diperlembutkan dengan 5 hingga 20% berat poli(etilena glikol) (PEG)
menggunakan pencampur dalaman. Adunan dengan 10% berat PEG dipilih sebagai
matriks komposit kerana ia mempunyai kekuatan hentaman dan pemanjangan takat
putus yang terbaik. Kedua, PLA dicangkuk maleik anhidrat (MAPLA) berjaya
dihasilkan dengan 0.22% pencangkukan melalui kaedah pencangkukan reaktif
Komposit p-PLA/KBF telah disebatikan di dalam pencampur dalaman dan diacuan
mampat ke bentuk sampel ujian. Kandungan KBF diubah dari 10 hingga 40% berat.
Pencirian telah dilakukan melalui ujian tensil dan hentaman, analisis mekanikal
dinamik, penyerapan air, penanaman dalam tanah dan pencuacaan semulajadi. Pad a
pembebanan 40% berat KBF, kekuatan tensil dan modulus masing-masing
meningkat sebanyak 120% dan 213%, manakala pemanjangan takat putus dan
kekuatan hentaman masing-masing menurun sebanyak 99% dan 52%, berbanding pPLA
tidak terisi KBF.
Kenaf bast fiber (KBF) filled plasticized poly(lactic acid) (p-PLA)
composites was prepared and examined stage by stage in this study. Firstly,
poly(lactic acid) (PLA) was plasticized with 5 up to 20 wt% poly(ethylene glycol)
(PEG) via internal mixer. Blend with 10 wt% PEG was chosen as matrix for
composite as it showed the best impact strength and elongation at break. Secondly,
maleic anhydride grafted PLA (MAPLA) was successfully produced with 0.22%
grafting using reactive grafting method, and used as a compatibilizer for the
composite system. p-PLAlKBF composite was compounded via internal mixer and
compression molded into test specimens. KBF loading was varied from 10 to 40
wt%. Characterization was done by means of tensile and impact testing, dynamic
mechanical analysis, water absorption, soil burial and natural weathering. At 40 wt%
KBF loading, tensile strength and modulus improved by 120% and 213%
respectively, while strain at break and impact strength dropped by 99% and 52%
respectively compared to neat p-PLA.
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