Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Effect of Blowing Agent Concentration on Cell Morphology and Impact Properties of Natural Rubber Foam | Journal of Physical Science Vol. 20 1 13-25 2009 13 Effect of Blowing Agent Concentration on Cell Morphology and Impact Properties of Natural Rubber Foam N.N. Najib1 Z.M. Ariff1 N.A. Manan1 A.A. Bakar1 and C.S. Sipaut2 1School of Material and Mineral Resources Engineering Engineering Campus Universiti Sains Malaysia 14300 Nibong Tebal Pulau Pinang Malaysia 2 School of Chemical Sciences Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia Corresponding author nornadirah@gmail.com Abstract The concentration of sodium bicarbonate as a chemical blowing agent was varied to evaluate its effect on the morphology and impact properties of natural rubber foam. The expandable rubber samples were prepared using a conventional two-roll mill and were then expanded via a heat transfer foaming process using compression moulding and an air-circulating oven. The physical properties of the natural rubber foams were characterised and the results were observed to systematically correlate with the impact properties of the foam. The absorbed energy of the foam increases with decreasing crosslink density and relative foam density which is associated with the formation of smaller foam cells and an increase in the number of cells per unit volume. Keywords natural rubber foam morphology impact Abstrak Kandungan sodium bikarbonat sebagai agen pembusaan kimia dipelbagaikan bagi mengkaji kesannya terhadap morfologi dan sifat hentaman busa getah asli. Getah boleh-kembang disediakan menggunakan penggiling bergulung dua dan kemudian dibusakan menerusi proses pindahan haba menggunakan pengacuanan mampatan dan oven aliran udara panas. Sifat-sifat fizikal busa getah asli dicirikan dan keputusannya boleh dikaitkan secara sistematik dengan sifat hentaman busa. Tenaga penyerapan busa meningkat dengan penurunan ketumpatan sambung silang dan ketumpatan relatif busa dimana ini memberikan purata saiz sel yang kecil dan peningkatan dalam bilangan sel per unit isipadu. Kata kunci getah asli busa .
