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Journal : Jurnal Polimesin

Chemical treatments' effect on the structural and mecha-nical properties of polyvinyl alcohol/spent coffee ground composite films Muhibbuddin, Muhibbuddin; Ilham, Farid; Muhammad, Ikramullah; Rizal, Samsul
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7204

Abstract

Chemical treatments are a common strategy for improving the compatibility of natural fillers with polymer matrices. However, their specific impact on Spent Coffee Grounds (SCG) as reinforcement for Polyvinyl Alcohol (PVA) composites remains unclear. This study investigates the effects of alkalization, bleaching, and acid hydrolysis on the structural and mechanical properties of PVA/SCG composite films. The SCG was treated with 10% NaOH, 10% NaOCl, and 1 M H₂SO₄. FTIR analysis showed that untreated SCG exhibited characteristic C–H stretching peaks at 2922 cm⁻¹ and 2853 cm⁻¹, corresponding to methyl and methylene groups in cellulose and hemicellulose. After alkalization and bleaching, these peaks nearly disappeared, indicating excessive removal of hemicellulose and lignin and suggesting structural degradation of the filler. In contrast, acid hydrolysis largely preserved these peaks, reflecting milder structural modification. Mechanical testing confirmed this trend: the untreated composite achieved the best performance, with tensile strength of 2.30 MPa and tear resistance of 2.12 N All chemically treated samples showed reduced strength and toughness, with alkalization being the most detrimental. These findings demonstrate that the decline in mechanical properties is directly correlated with structural damage detected by FTIR, emphasizing the need to optimize treatment severity.
Co-Authors . Saminan Abdullah Abdullah Ali Sarong Ameilia Zuliyanti Siregar Andi Ulfa Tenri Pada Arahman*, Nasrul Arfika Yusti. R Harahap Ariannisa Ramadhanti Arkani, Adelia Armaini Rambe Asiah Asiah Asri Gani Aulia, M Prayogie Azzaahro, Vivia Salma Baehaqi Citra Yolantia Cut Eka Para Samya Cut Nurmaliah Cut Putri Amalya Debby Pratiwi Desriana, Putri Devi Syafrianti Dini Fitria Djufri - Erni Erni evendi, evendi Fadliyani Fadliyani Fadwa, Frida Faisal Abdullah Fakhrah Fakhrah Fani Fardinita Farza Safirda Habib, Ikhwanul Hafnati Rahmatan Hanny Hafiar Hasanuddin Hasanuddin Herliana, Fitriana Hilma Harmen Hilwah Nora Husnawati Husnawati Ilham, Farid Indera Sakti Nasution Iskandar, Kaisah Ghufrani Ismul Huda Iswadi Iswadi Juliarti, Juliarti Kabalmay, Taqiyuddin Khairil Khairil Khairil Khairil M. Danil M. Syukri Mahidin Mahidin Maizaliani, Cut Roza Maulida Maulida Melinda Melinda Meutia Nauly Miftahul Munawwarah Miftahul Munawwarah Muhammad Syukri Muhammad, Ikramullah Muhiddin, Muhiddin Mumtaza, Abdurrahman Nadia Aldyza Nasrul Arahman Novita Novita Puspa, Vivera Ruselli Rahman, Supandi Ramli, Ichwana Raupu, Mutiara Rika Susanti Ririn Yuningsih Roslimah Roslimah Safrida Safrida Safrida Safrida Sahabi, Ansar Samingan Samingan Samsul Kamal Siregar, Netti Herlina Siska Murti Soraya, Yenni Suhrawardi Ilyas Sulastri Sulastri Supriatno Supriatno Syafi’i, Ahmad Musta’in Tulus Tulus Wardiah Wardiah Winarti Winarti Wiwit Artika Yudhistira Anggraini, Yudhistira Yuli Heirina Hamid, Yuli Heirina Yusrizal Yusrizal Zahroh, Roihatul Zai, Sajid Ali Yousuf Zulkifli Nasution