KAJIAN SIFAT FISIKA DAN MORFOLOGI KARET ALAM SELULAR PADA VARIASI TIPE BAHAN PENGEMBANG DAN BOBOT KOMPON
DOI:
https://doi.org/10.22302/ppk.jpk.v41i2.837Keywords:
aditif pengembang organik, Azodicarbonamide, kepadatan, rasio ekspansiAbstract
Busa karet alam yang memiliki struktur mikro-seluler (karet selular) merupakan bahan berbasis biopolimer yang menarik untuk dikembangkan. Beberapa keunggulan karet selular diantaranya ringan, ergonomis karena bersifat berpori, dan ekonomis sehingga cocok digunakan sebagai produk barang jadi karet untuk berbagai keperluan mulai dari teknik hingga rumah tangga. Pada penelitian ini dibuat karet selular dengan menggunakan Azodikarbonamida (ADC) sebagai bahan pengembang (blowing agent). ADC yang digunakan divariasikan menjadi tipe A dan C. Lebih lanjut, bobot kompon karet yang akan dicetak menjadi karet selular divariasikan sebesar 8; 12; 13,5; 15; dan 17 gram. Pembuatan karet selular mengacu pada metode umum pembuatan kompon karet dilanjutkan dengan pencetakan. Evaluasi mutu karet selular dilakukan melalui pengujian visualisasi struktur morfologi, densitas, dan rasio ekspansi. Berdasarkan hasil pengujian diperoleh bahwa bobot kompon terbaik adalah sebesar 13,5 gram karena menghasilkan karet seluler dengan struktur morfologi seragam. Sementara tipe bahan pengembang dipilih tipe A karena menghasilkan karet seluler dengan densitas rendah namun rasio ekspansi tinggi.
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