Samudra, Ghifaari Audry (2025) Implementasi Shape Memory Polymer pada Gripper Berbasis 4D Printing: Pengaruh Variasi Massa Microcrystalline Cellulose dan Exposure Time terhadap Sifat Mekanik dan Performa Shape Fixity-Recovery. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proses fabrikasi polimer terdiri dari berbagai metode, dengan tingkat keakuratan produk yang berbeda-beda. Salah satu cara untuk meningkatkan akurasi adalah menggunakan material liquid photocurable polymer dengan mesin Digital Light Processing (DLP), yang mampu memproduksi objek hingga tingkat microfabrication. Salah satu polimer unik yang digunakan adalah shape memory polymer (SMP), yaitu material cerdas yang mampu berubah bentuk dan kembali ke bentuk semula dengan stimulus eksternal. Namun, SMP memiliki kekurangan dalam mempertahankan bentuknya, sehingga membatasi aplikasinya untuk keperluan tingkat lanjut. Oleh karena itu, digunakan Microcrystalline Cellulose (MCC) sebagai bahan penguat untuk meningkatkan kekakuan matriks SMP. Penelitian ini menggunakan metode eksperimen dengan variasi massa MCC sebesar 0%, 0,2%, 0,4%, dan 0,6%, serta durasi exposure time selama 15 dan 30 detik. Komposisi matriks melibatkan tert-Butyl Acrylate (tBA) sebagai soft segment dan Hexanediol Diacrylate (HDDA) sebagai hard segment. Pengujian meliputi shape fixity, shape recovery, uji tarik ASTM D638, serta karakterisasi material menggunakan FTIR, SEM, TGA, dan DSC. Hasil penelitian menunjukkan bahwa penambahan MCC dan peningkatan exposure time memberikan tren positif terhadap shape fixity ratio dan shape recovery ratio, yang meningkat seiring bertambahnya massa MCC dan durasi exposure time. Hal ini disebabkan oleh peningkatan kekakuan matriks SMP, yang memperkuat kemampuan objek hasil 4D printing untuk mempertahankan bentuknya. Peningkatan kekakuan sebesar 17,24% pada variasi 0.6MCC 30ET terhadap 0MCC 15ET terbukti berhasil membatasi mobilitas soft segment, sementara efek springback yang lebih besar meningkatkan kemampuan pemulihan bentuk. Variasi 0.6MCC-30ET memberikan performa terbaik dengan nilai shape fixity ratio sebesar 96%, 95%, dan 94%, serta shape recovery ratio sebesar 90%, 95%, dan 98% secara berturut-turut pada siklus pertama hingga ketiga.
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Polymers are manufactured using a variety of techniques, each with varying degrees of product precision. The use of liquid photocurable polymer materials with Digital Light Processing (DLP) equipment, which can create things at the microfabrication scale, is one way to increase precision. Shape memory polymer (SMP), a smart material that can change shape and return to its original form in response to environmental stimuli, is a special polymer used in this process. However, SMP's inability to hold its shape limits its use in sophisticated applications. To increase the stiffness of the SMP matrix, microcrystalline cellulose (MCC) is used as a reinforcing ingredient. This study uses an experimental approach with exposure times of 15 and 30 seconds and MCC mass changes of 0%, 0.2%, 0.4% and 0.6%. Hexanediol diacrylate (HDDA) is the hard segment and tert-butyl acrylate (tBA) is the soft segment of the matrix composition. Tensile testing (ASTM D638), shape fixity, shape recovery, and material characterization using FTIR, SEM, TGA, and DSC are part of the testing process. According to the results, the shape fixity ratio and shape recovery ratio show a favorable trend with the addition of MCC and longer exposure times, improving with increasing MCC mass and exposure time. This is explained by the increased stiffness of the SMP matrix, which improves the ability of 4D printed parts to retain their shape. While the greater springback effect enhances shape recovery capabilities, the 17.24% increase in stiffness of the 0.6MCC-30ET variant over the 0MCC-15ET variant effectively limits the mobility of the soft segment. The 0.6MCC-30ET variant performs best with shape retention rates of 96%, 95%, and 94% and shape recovery rates of 90%, 95%, and 98% for the first, second, and third cycles, respectively.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | digital light processing, microfabrication, shape memory polymer, exposure time, soft segment, hard segment, shape fixity ratio, shape recovery ratio, printing, liquid photocurable resin, pemrosesan cahaya digital, mikrofabrikasi, polimer dengan memori bentuk, waktu paparan, segmen lunak, segmen keras, rasio fiksasi bentuk, rasio pemulihan bentuk, pencetakan, springback |
| Subjects: | T Technology > TS Manufactures > TS183 Manufacturing processes. Lean manufacturing. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Ghifaari Audry Samudra |
| Date Deposited: | 22 Jan 2025 01:08 |
| Last Modified: | 22 Jan 2025 01:08 |
| URI: | http://repository.its.ac.id/id/eprint/116514 |
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