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DEVELOPMENT OF POLYURETHANE/CLAY NANOCOMPOSITES BASED ON PALM OIL POLYOL Ummi Habibah; A Adriana; S Sariadi; M Muhammad; Halim Zaini; Sabila Yasara SA; F Fachraniah
Jurnal Sains dan Teknologi Reaksi Vol 21, No 01 (2023): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v21i01.4189

Abstract

Polyurethanes (PURs) are highly adaptable polymeric substances with a variety of physical and chemical attributes. High abrasion resistance, tear strength, shock absorption, flexibility, and elasticity are just a few of the desirable qualities of PURs. Despite their generally low thermal stability, this can be enhanced by utilizing clay that has been treated. From renewable resources, polyurethane/clay nanocomposites have been created. By combining oleic acid from palm oil with glycerol, a polyol for the manufacture of polyurethane by reaction with an isocyanate was created. As a catalyst and emulsifier, dodecylbenzene sulfonic acid (DBSA) was employed. Octadodecylamine (ODA-mont) and cetyltrimethyl ammonium bromide (CTAB-mont) were used to treat the unaltered clay (kunipia-F).  The d-spacing in CTAB-mont and ODA-mont were bigger than that of the pure-mont (1.142 nm) at 1.571 nm and 1.798 nm, respectively. A pre-polymer technique was used to create polyurethane/clay nanocomposites, and the micro-domain structures of segmented PU, CTAB-mont-PU 1, 3, and 5 wt%, and ODA-mont-PU 1, 3, and 5 wt% were determined by FTIR spectra. X-ray diffraction (X-RD) was used to evaluate the nanocomposites' morphology, and the results revealed that all of the intercalated type's nanocomposites were created as a result of this effort. When the surfaces of the materials were examined using transmission electron microscopy (TEM) observation and scanning electron microscopy (SEM), these were further confirmed. Thermogravimetric analysis (TGA) was used to examine thermal stability.Pure PU begins to degrade around 200°C, which is lower than the degrading rates of CTAB-mont PU and ODA-mont PU, which occur at roughly 318°C and 330°C, respectively. Both pure polyurethane (PU) and PU/clay nanocomposites have their mechanical properties, including dynamic mechanical properties, tested. With only a 5 weight percent addition of the montmorillonite CTAB-mont PU or ODA-mont PU, respectively, the tensile strength of the nanocomposites increased by more than 214% and 267%, respectively, demonstrating the impressively positive impact of the modified organoclay on the strength and elongation at break of the nanocomposites.Keywords: Clay,Palm Oil, Polyurethane
BIOPESTICIDES FROM PAPAYA LEAVES AND TEMBELEKAN LEAVES TO CONTROL ARMYWORM PESTS (Spodoptera Litura F) F Fachraniah; Asmaul Husna; E Elwina
Jurnal Sains dan Teknologi Reaksi Vol 21, No 01 (2023): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v21i01.4237

Abstract

Biopesticides made from papaya leaves and tembelekan leaves to control armyworm pests (Spodoptera litura F) have been carried out, these two plants are relatively easy to find around us and contain active compounds that have the potential as insecticides. Plant extracts are obtained by maceration using ethanol solvent p.a, then evaporated to separate the extract and solvent so that an extract is obtained. The variables of the study conducted were the composition of P100: T10, P90: T10, P80: T20, P70: T30, and P0: T100. Soaking time 1-4 days and applied to armyworm (Spodoptera litura F) for 2 hours. The results of the study reached the quality of P100:T0 and P90 biopesticides; T10 with a soaking time of 1-3 days obtained an average armyworm mortality of 88.6%. The characteristics of biopesticides produced from tannin levels and flavonoid levels have a positive correlative relationship with the mortality power of gryak caterpillars (Spodoptera litura F), P100: T0 there are 0.0366% tannin levels and 1.58% flavonoid levels with 76% mortality power and P90:T10 there are 0.03725 tannin levels and 1.6394% falvonoid levels with 100% mortality power. Keywords: Biopesticides, Mortality, and Spodoptera litura F