Tri Wahyuni, - (2015) Karakterisasi Termomekanik Komposit PEG 4000-Silika Kristobalit Menggunakan Dynamic Mechanical Analysis (DMA). Undergraduate thesis, Institut Teknology Sepuluh Nopember.
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Abstract
Sintesis dan karakterisasi termomekanis komposit
polietilen glikol-silika kristobalit telah berhasil dilakukan.
Polietilena glycal (PEG) 4000 digunakan sebagai matriks. Pengisi
kristobalit dihasilkan dengan metode kopresipitasi menggunakan
pasir silika dari Tanah Laut, Pelaihari, Kalimantan Selatan
sebagai bahan baku. Komposisi PEG-silika bervariasi dalam
komposit. Sifat termomekanis dikarakterisasi menggunakan
instrumen Dynamic Mechanical Analysis (DMA) dengan modulus
geser. Menurut karakterisasi XRD, pengisi mengandung 98,8
%wt kristobalit rendah dan 1,2 %wt trydimite. Analisis data FTIR
dan XRD menunjukkan tidak ada puncak baru yang menunjukkan
keberhasilan pembentukan komposit. Nilai modulus penyimpanan
(G’) komposit meningkat dengan penambahan kristobalit. Hal itu
juga mengungkapkan bahwa dengan meningkatkan jumlah
kristobalit, suhu transisi kaca (Tg) dan efektivitas pengisi pada
modulus komposit meningkat. Sementara itu, modulus hilang
(G") meningkat dengan penambahan pengisi menunjukkan energi
yang lebih besar yang dikeluarkan oleh komposit akibat gesekan.
Nilai puncak dari faktor redaman (tan δ) menurun dengan
meningkatnya jumlah pengisi karena pengisi akan menghambat
pergerakan bebas rantai polimer. Puncak tertinggi dari tan δ
adalah sampel P100 yang tidak mengandung pengisi silika.
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Synthesis and thermomechanical characterization of
polyethylene glycol-silica cristobalite composites have been
successfully performed. The polyethylene glycal (PEG) 4000 was
used as the matrix. The cristobalite filler was produced by a
coprecipitation method using silica sand from Tanah Laut, South
Kalimantan as the raw material. The PEG-silica composition was
varied in the composites. The thermomechanical properties was
characterised using Dynamic Mechanical Analysis (DMA)
instrument with shear mode. According to the XRD
characterization, the filler contained 98.8 %wt low cristobalite
and 1.2 %wt trydimite. FTIR and XRD data analysis showed no
new peaks indicating the success of the formation of the
composite. The storage modulus (G’) value of the composites
increased with the addition of cristobalite. It was also found that
by increasing the amount of cristobalite, the glassy transition
temperature (Tg) and the effectiveness of filler on the moduli of
the composites increased. Meanwhile, the loss modulus (G")
increased with the addition of fillers indicating the greater energy
released by the composites due to friction. The peak value of the
damping factor (tan δ) decreased with increasing filler amount
since the filler will hinder the free movement of the polymer
chains. The highest peak of the tan δ is of the P100 sample which
contained no silica filler.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSFi 668.423 4 Tri k |
| Uncontrolled Keywords: | komposit PEG 4000-Silika kristobalit, modulus penyimpanan, modulus hilang. |
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL240.5 Composite materials |
| Divisions: | Faculty of Mathematics and Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 10 Dec 2019 08:12 |
| Last Modified: | 10 Dec 2019 08:12 |
| URI: | http://repository.its.ac.id/id/eprint/72320 |
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