Penelitian ini bertujuan untuk memodifikasi material karet alam (Hevea brasiliensis) menjadi cushion gum karet-kanvas (retread ban pesawat) menggunakan resin polimer. Resin polimer yang digunakan adalah Resorcinolic resin (reinforce resin, adhesion promoter) dan Rhenogran Hexamethylenetetraamine-80 (Curing Agent dan Pembentuk struktur crosslinker). Variasi antara Resorcinol dan Hexa yakni FRC-0 (0:0), FRC-1 (1:1), FRC-2 (1:2) dan FRC-3 (1:3). Pada tahap pertama dilakukan pengujian fisik dan mekanik meliputi kekuatan tarik, kekuatan sobek, elongation, hardness, rebound, compression, density dan abrasion resisitance serta carbon dispersion. Untuk uji kimia meliputi FT-IR dan TGA. Sedangkan untuk uji kerekatan dilakukan dengan uji peel test. Dilakukan juga proses aging dengan pemanasan selama tiga hari dengan suhu 70oC. Dari hasil pengujian fisik dan mekanik dapat diketahui bahwa tackifier (resorcinol formaldehid novolak resin) terpolimerisasi dengan dibuktikan adanya perbedaan sifat fisik dan mekanik masing-masing cushion gum. Dari uji ANOVA single dan ANOVA double test untuk proses aging secara umum tackifier (resorcinol formaldehyde novolak resin) berperan signifikan dalam perbaikan nilai fisik dan mekanik produk cushion gum. Adanya kenaikan nilai tensile dan hardness saat sesudah aging disebabkan adanya polimerisasi lanjutan dari tackifier (resorcinol formaldehid novolak resin). Dari uji FT-IR cushion gum diperoleh beberapa gugus fungsi khas yakni -OH bending (3000-3500 cm-1), -CH- methyl dan methylene (3000-2800 cm-1), -C=C-(1660-1500 cm-1) karet serta methylene bridge (-CH- bending) (1500-1400 cm-1). Korelasi kenaikan nilai hardness dan tensile serta berbagai kecendrungan perbaikan parameter fisik lainnya setelah aging dikonfirmasi melalui spektra dengan adanya kenaikan intesitas peak –OH dan -CH- (methylen bridge). Dari hasil uji TGA diperoleh hasil bahwa cushion gum dengan penambahan tackifier (resorcinol formaldehyde novolak resin) mampu/memiliki ketahanan thermal lebih daripada cushion gum tanpa tackifier. Dari hasil pengujian kerekatan/peel test, untuk formulasi FRC-1 memiliki max load sebesar 150-190N dengan pengamatan visual tidak terjadi displacement atau debonding area, sedangkan untuk FRC-2 memiliki max load sebesar 80-116N dengan dibuktikan pengamatan visual muncul displacement atau debonding area. Dari seluruh pengujian, FRC-1 (1:1) merupakan formulasi cushion gum terbaik yang dapat digunakan untuk retread ban pesawat.

The aim of this research is to modify natural rubber (Heveabrasiliensis) becoming a cushion gum for rubber-canvas (retread tyre aircraft) with polymeric resin. The polymeric resin is Recorcinolic resin (adhesion promoter and reinforce resin) and then combined withRhenogran Hexamethylenetetraamine-80 (as curing agent and crosslinker link bond). Combination from two compouns is usually calledtackifier resin or recorcinol formaldehyde novolac resin. The molar mass ratio between recorcinol and rhenogranhexa had been varied namely ratio(1:1) called FRC-1, ratio (1:2) as FRC-2, ratio (1:3) as FRC-3 and FRC-0 with no teckifier as a control.Sseveral physical and mechanical testing such as tensile strength, tear strength, Hardness, rebound resilience test, compression set,abrasion test, density test and carbon disperse were observed. For Chemical testing, FT-IR and TGA were utilized. Furthermore,to check and confirm about tackifying properties of cushion gum, the peel test had been observed. In addition, aging test also had been conducted within 70 oC for three days. From the result of physical and mechanical tests, it could be determined that tackifier resin (recorcinolic formaldehyde novolac resin resin) were directly polymerize during vulcanizing process. ANOVA single test and ANOVA double test were investigated to check the influence of tackifier resin and aging test. From the result, it can be concluded that tackifier resin had significant level role as areinforce physical and mechanical properties of cushion gum. The result after aging step indicated that hardness and tensile properties increased and several parameters had good trend for reinforcement properties which were also confirmed with FT-IR spectrainvestigations. From FT-IR spectra several unique peak like –OH bending –CH- methylene bridge also increased in the peak intensity respectively. The TGA test for cushion containingtackifier resins had good thermal stability as compared to the cushion without tackifier resin. From the peel test results, FRC-1 (1:1) discharged the maximum load from 150-190 N. This value was higher than FRC-2 with just released the maximum load from 80-116 N. In addition from the visual observation at the interface area, there were no displacement and debonding areas. However, in FRC-2, it was observed the displacement and debonding areas.From the overall of the testing results, the FRC-1(1:1) was the best formula as a cushion gum for retread tyre air craft.

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