KARAKTERISASI SIFAT TERMAL DAN OPTIK POLYDIMETHYLSILOXANE SEBAGAI LENSA INVERS
DOI:
https://doi.org/10.17146/jsmi.2017.18.4.4149Keywords:
Polydimethylsiloxane, Suhu, Tetesan, Dripping, Intensitas Cahaya, Light Intensity, Termal, ThermalAbstract
CHARACTERIZATION THERMAL AND OPTICAL PROPERTIES OF POLYDIMETHYL SILOXANE AS LENS INVERSE. Polydimethylsiloxane (PDMS) is stable silicone rubber by physical and chemical. This material available by commercially. PDMS is a polymer material has a refractive index of 1.47 to 1.55 and high transparency till 95% that it best used as simple optical instruments such as an inverse lens. The aims this study is to create the inverse lens of PDMS and investigated the optical and thermal properties this polymer. Step researches are mixing, dripping, invers, and curing. Mixing is done by PDMS base with PDMS curing agent in ratio 10:1. Then dripping on a glass slide and then inverted with variations droplets is 2, 3, and 4 drops. Curing has variations temperature is 70, 80, and 90°C. Characterizations are use SEM, lux meter, and TGA. The result of lux meter analysis is the lower temperature can be higher light intensity. SEM showed bubbles on the lens which the more high volume of lens can be more less bubbles on the lens. TGA analysis showed there is no significant change for value of degradation (Td) for the curing temperature in the range 70°C to 90°C. The best results are used with a variety of 4 drops at temperature of 70°C with value of intensity at 177 lux and value of Td at 301,5°C.
ABSTRAK
KARAKTERISASI SIFAT TERMAL DAN OPTIK POLYDIMETHYLSILOXANE SEBAGAI LENSA INVERS. Polydimethylsiloxane (PDMS) adalah karet silikon yang stabil secara fisik dan kimia dan telah tersedia komersial. PDMS merupakan material polimer dengan rentang indeks bias 1,47-1,55 dan mempunyai karakter transparansi yang tinggi mencapai 95% sehingga bahan ini baik digunakan sebagai alat optik sederhana berupa lensa invers. Penelitian ini bertujuan untuk membuat lensa invers dari polimer PDMS serta mengetahui sifat optik dan termalnya. Tahapan penelitian lensa invers meliputi : pencampuran antara base PDMS dengan curing agent PDMS dengan perbandingan 10:1, kemudian dilakukan proses penetesan diatas slide kaca lalu dibalikkan (invers) dengan variasi jumlah tetesan 2, 3 dan 4 drop dan terakhir dilakukan proses curing dengan variasi suhu curing 70°C, 80°C, dan 90°C. Karakterisasi bahan meliputi analisis morfologi lensa menggunakan SEM/EDX, intensitas cahaya menggunakan luxmeter serta analisis nilai transtition glass (Tg) menggunakan TGA/DTA. Hasil karakterisasi analisis luxmeter menunjukkan semakin rendah suhu curing semakin tinggi intensitas cahaya yang dapat menembus lensa. Foto SEM memeperlihatkan adanya gelembung pada lensa. Semakin besar volume lensa maka semakin sedikit gelembung pada lensa. Hasil analisis menggunakan TGA memperlihatkan untuk rentang suhu pemanasan antara 70°C hingga 90°C nilai suhu degradasi (Td) lensa invers tidak berpengaruh signifikan. Hasil penelitian ini menunjukkan bahwa lensa yang baik adalah pada variasi 4 tetes dan suhu curing 70 °C dengan nilai intensitas 177 lux dan nilai Td sebesar 301,5°C.
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