Fitrilia Silvianti Department of Rubber and Plastic Processing Technology, Politeknik ATK Yogyakarta,
Jl. Ringroad Selatan, Glugo, Panggungharjo, Sewon, Bantul, Yogyakarta 55188 Indonesia
Dwi Siswanta Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada,
Sekip Utara PO. Box BLS 21, Yogyakarta 55281 Indonesia
Nurul Hidayat Aprilita Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada,
Sekip Utara PO. Box BLS 21, Yogyakarta 55281 Indonesia
Agung Abadi Kiswandono Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Lampung,
Jl. Soemantri Brojonegoro No.1 Rajabasa Bandarlampung Indonesia