POTENSI PENGGUNAAN KARET ALAM TERMOPLASTIK (COPOLYMER NR-VYNIL MONOMER) UNTUK ALTERNATIF MODIFIER ASPAL KARET: I. PEMBUATAN KARET ALAM TERMOPLASTIK DARI KARET ALAM DAN MONOMER VINIL SECARA KOPOLIMERISASI CANGKOK EMULSI
DOI:
https://doi.org/10.22302/ppk.jpk.v39i2.787Keywords:
aspal, emulsi, karet alam, kopolimerisasi cangkok, termoplastikAbstract
Aspal karet merupakan salah satu bentuk aspal modifikasi polimer. Umumnya, aspal modifikasi polimer dibuat dengan mencampurkan modifier termoplastik elastomer sintetik jenis stirena butadiene stirena (SBS) ke dalam aspal. SBS berpotensi digantikan oleh karet alam termoplastik (Thermoplastic Natural Rubber, TPNR). Di Indonesia, pengembangan aspal karet skala lapangan telah diinisasi sejak 2016 namun belum menggunakan TPNR. Riset ini bertujuan untuk mempelajari karakteristik TPNR yang dibuat melalui kopolimerisasi cangkok emulsi karet alam protein rendah (DPNR) dengan kombinasi monomer vinil (MV) stirena (ST) dan metil metakrilat (MMA). Komposisi DPNR/MV diatur pada 60/40 bagian, sedangkan rasio kombinasi MV ditetapkan sebesar 1:2; 1:1; 2:1. Urutan penambahan MV diatur MMA dahulu diikuti ST, dan sebaliknya. Hasil eksperimen menunjukkan bahwa TPNR atau kopolimer cangkok yang disintesis dari DPNR dengan penambahan ST diikuti MMA pada rasio 2:1 (kopoli (DPNR/ST-MMA 2:1)) memiliki sifat yang paling mendekati SBS sehingga berpotensi digunakan sebagai alternatif modifier dalam pembuatan aspal karet.
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