ABSTRAK. Awaluddin Thayab: Hubungan sifat mekanik dengan morfologi komposit terisi termoplastik..., USU e-repository 2008

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4 IV ABSTRAK Tesis ini melaporkan keputusan kajian hubungan sifat mekanik dan morfologi permukaan patah komposit terisi adunan termoplastik kitar semula bertetulang kaca -E. Komposit bertetulang kaca -E dibina dengan polipropilena (PP) sebagai komponen utama matriks dan termoplastik terkitar semula (TTS) polietilena ketumpatan tinggi (PEKT) dan polistirena (PS) sebagai komponen pengisi. Gentian dan zarah kaca -E dengan peratus komposisi 15% ±l (% jisim total komposit!% jisim kaca) digunakan sebagai fasa penetu1ang. Dua kategori sampel komposit terisi dengan pelbagai adunan dan peratus komposisi (% jisim komponen utarna/% jisim pengisi/% jisim kaca -E) berasaskan fasa penetulang dihasilkan iaitu meliputi adunan : PPIPEKT-Klkaca -E, PPIPS-Klkaca -E dan gabungan PPIPS-K+10%PEKT-K! kaca -E dengan komposisi : 100/0/15, 95/05/15, 90/10/15, 85/15/15 dan 80/20/15. Keputusan ujikaji secara umum menunjukkan komposisi adunan memberi kesan langsung ke atas sifat bahan komposit. Nilai kekuatan tegangan (ca), peratus pemanjangan putus (e) menurun sedangkan nilai kekuatan hentaman cenderung kekal dengan penambahan peratus jisim pengisi. Modulus kekenyalan komposit terisi (E) pada komposisi 20% pengisi didapati merupakan had nilai yang mana kecenderungan lengkungan kekakuan menurun di bawah nilai tersebut, dan sebaliknya meningkat dengan penambahan peratus jisim pengisi. Fasa penetulang sangat mempengaruhi kekuatan hentarnan komposit. Morfologi permukaan gagal diarnati dengan menggunakan kemikroskopan elektron imbasan (KEI). Hasil pengamatan menunjukkan morfologi permukaan patah terdiri daripada serakan domain butiran pengisi dan lompang, dengan saiz semakin membesar dengan penarnbahan peratus jisim pengisi TTS. Tetulang gentian kaca -E dan serakan domain butiran pengisi berada dalarn skala mikro yang memberikan kesan ke atas sifat mekanik komposit manakala saiz tetulang zarah kaca -E berada dalarn skala meso memberikan kesan keatas nilai hentaman. Tiga struktur morfologi dipaparkan: (i) Matriks ko-selanjar dengan serlahan tetulang zarah kaca -E pacta 100% PP, (ii) Carnpuran domain butiran pengisi dan tetulang zarah kaca -E dan (iii) Campuran domain butiran pengisi, tetulang dan gegentian dengan penarnbahan peratus jisim pengisi kitar semula. Mekanisme gaga! yang berlaku dipaparkan sebagai pencabutan domain butiran pengisi serta tetulang zarah kaca dengan meninggalkan kesan lompang atau putusnya tetulang gentian kaca. Awaluddin Thayab: Hubungan sifat mekanik dengan morfologi komposit terisi termoplastik..., 2001.

5 v SURFACE MORPHOLOGY AND MECHANICAL PROPERTY RELATIONSHIP OF E-GLASS PARTICLE AND FIBRE REINFORCED RECYCLED THERMOPLASTIC FILLED COMPOSITES ABSTRACT A study on the relationship of mechanical property and fracture surface morphology of E- glass reinforced thermoplastic blend filled composites is reported. E- glass reinforced composites were produced using polypropylene (PP) as the matrix and high density polyethylene (HDPE) and polystyrene (PS) recycled thermoplastic as the filler component. E- glass particle and fibre with percentage composition of 15% ±l (% composite total massl% glass mass) were used as the reinforcement phase. Two categories of filled composite in various blends and compositions (% major component mass/% filler mass/% E- glass) based on reinforcement phase, were prepared, such PPIR-HDPE/glass, PPIR-PS/glass and PPIR-PS+ IO%R-HDPEI glass with composition: 10010/15, , 90/10115, and In general, the results of experiments show that blend composition has direct influence on composite blend property. The tensile strength cry and percentage of elongation at break s decreased while impact strength I remained with increased of filler. The limiting filler composition on modulus of elasticity was at 20% wt%/wt%, below which it decreased. The impact strength is greatly influenced by the reinforcement phase. Scanning electron microscopy (SEM) was used to observe the fracture surface morphology. The results show that fracture surface morphology consists of domains of dispersed filler particles and voids in which the particle size increases with increasing filler percentage. E-glass fibre reinforcement and dispersed filler particles domain on a micro scale have an effect on composite mechanical properties, while the reinforcement size of E-glass particle did so on a meso scale, on impact values. Three kinds of morphological structures are presented: (i) a continuous matrix with fibre reinforcement at 100% PP, (ii) mixture of filler particles and reinforcement domains, and (iii) mixture of filler particles, reinforcement, and fibrillar domains with increasing mass percentage of recycled filler. Failure mechanisms are presented as the pull-out of the filler particles and reinforcement domain with voids where they were left. Awaluddin Thayab: Hubungan sifat mekanik dengan morfologi komposit terisi termoplastik..., 2001.

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