Fadhil, Amiruddin (2026) ANALISIS VARIASI WAKTU HOT PRESS TERHADAP NILAI UJI TARIK DAN SIFAT FISIS KOMPOSIT PLASTIK BERMATRIX POLYPROPYLENE (PP) DENGAN AMPAS KOPI. Sarjana (S1) thesis, Universitas Muhammadiyah Indonesia.
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Abstract
he increasing amount of polypropylene (PP) plastic waste and spent coffee grounds (SCG) has become an environmental concern, encouraging the utilization of these wastes into value-added products, one of which is composite materials. This study aimed to investigate the effect of hot-pressing time on the mechanical and physical properties of polypropylene-based composites reinforced with spent coffee grounds. An experimental method was employed using three hot-pressing time variations: 3 minutes (KWP 1), 5 minutes (KWP 2), and 7 minutes (KWP 3), with a composition of 80% polypropylene and 20% spent coffee grounds. The tests conducted included tensile testing based on ASTM D638 Type I, as well as density, water absorption, and thickness swelling tests according to JIS A5908:2003. In addition, the composite microstructure was observed using a digital microscope. The results showed that the hot-pressing time significantly influenced the properties of the composite. KWP 1 exhibited the best performance, with a tensile strength of 1.32675 MPa and a strain value of 0.14324, while KWP 2 showed the highest density of 1.05 g/cm³. The lowest water absorption and thickness swelling values were also obtained by KWP 1, at 1.85% and 1.59%, respectively. Microstructural observations revealed that KWP 1 had a more uniform distribution of spent coffee ground particles and fewer voids than the other variations. Based on these findings, it can be concluded that a 3-minute hot-pressing time provides the optimum condition, producing a better balance of mechanical properties, physical properties, and microstructural characteristics. This study demonstrates that spent coffee grounds have considerable potential as a reinforcing filler in polypropylene composites, contributing to waste valorization while supporting the development of more environmentally friendly composite materials.
| Item Type: | Thesis (TA, Skripsi, Tesis, Disertasi) (Sarjana (S1)) |
|---|---|
| Contributors/Dosen Pembimbing,NIDN Dosen bisa diakses di LINK https://bit.ly/NIDNdosenunismabekasi: | Contribution Contributors / Dosen Pembimbing NIDN UNSPECIFIED Indriyani, Novi Laura 0410118401 UNSPECIFIED Ekawati, Fatimah Dian 0417068003 |
| Keywords / Kata Kunci: | Keywords: polypropylene, spent coffee grounds, composite, hot press, tensile strength, physical properties. |
| Subjects: | Manufaktur |
| Faculty: | Fakultas Teknik > Teknik Mesin S1 |
| Depositing User: | Mr Amiruddin Fadhil |
| Date Deposited: | 04 Aug 2026 04:02 |
| Last Modified: | 04 Aug 2026 04:02 |
| URI: | http://repository.umindonesia.ac.id/id/eprint/10314 |
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