Lemiye ATABEK SAVAŞ, Ayşegül ERDEM, Alperen KAPLAN, Mehmet DOĞAN

KALSİYUM HİPOFOSFİT VE MAGNEZYUM HİPOFOSFİT EMDİRİLMİŞ JÜT ELYAF KATKILI POLİ(LAKTİK ASİT) BİYOKOMPOZİTLERİNİN ISIL VE GÜÇ TUTUŞURLUK ÖZELLİKLERİNİN İNCELENMESİ

Bu çalışmanın amacı kalsiyum hipofosfit (CHP) ve magnezyum hipofosfit (MHP) emdirilmiş jüt elyaf (JE) ile katkılandırılanpoli(laktik asit) (PLA) biyokompozitlerinin ısıl ve güç tutuşurluk özelliklerinin incelenmesidir. Bu amaç doğrultusunda ağ. %5 ve%10’luk CHP ve MHP çözeltileri ile ayrı ayrı işlem görmüş JE kurutulduktan sonra sabit oranda (ağ. %20) PLA içerisine eriyikharmanlama yöntemiyle ilave edilerek biyokompozitler üretilmiştir. Üretilen PLA biyokompozitlerin ısıl özellikleri termogravimetikanaliz (TGA), güç tutuşurluk özellikleri ise limit oksijen indeksi (LOI), dikey (UL-94V) ve yatay yanma (UL-94HB) testleri iledeğerlendirilmiştir. TGA test sonuçlarından, CHP ve MHP emdirilmiş JE’nin ilavesiyle PLA biyokompozitlerinin ısıl kararlılığı ve külkalıntısı miktarının arttığı ve bunlara bağlı olarak da güç tutuşurluk özelliklerinin iyileştiği tespit edilmiştir. LOI test sonuçlarından,JE’nin işlem gördüğü çözelti içerisindeki hipofosfitlerin yüzdesi arttıkça PLA biyokompozitlerinin LOI değerlerinin de arttığıgözlenmiştir. UL-94V ve UL-94HB test sonuçları ise ağ. %10’luk CHP çözeltisi ile işlem görmüş JE ile katkılandırılan PLAbiyokompozitinin en iyi güç tutuşurluk performasına sahip olduğunu göstermektedir.

INVESTIGATION OF THERMAL AND FLAMMABILITY PROPERTIES OF POLY(LACTIC ACID) BIOCOMPOSITES REINFORCED WITH CALCIUM HYPOPHOSPHITE AND MAGNESIUM HYPOPHOSPHITE IMPREGNATED JUTE FIBER

The aim of this study is to investigate the thermal and flammability properties of poly(lactic acid) (PLA) biocomposites reinforced with calcium hypophosphite (CHP) and magnesium hypophosphite (MHP) impregnated jute fiber (JE). For this purpose, biocomposites were produced by adding the jute fibers (JEs), which are treated separately with 5% and 10% CHP and MHP solutions and dried, to the PLA at a constant rate (20% wt) by melt blending method. Thermal properties of the PLA biocomposites produced were evaluated by thermogravimetic analysis (TGA), also their flammability properties were investigated by using limit oxygen index (LOI), vertical (UL-94V) and horizontal burning (UL-94HB) tests. As a result of the TGA tests, it was determined that the addition of JEs impregnated with CHP and MHP, the thermal stability and char residue amount of PLA biocomposites increased, and consequently the flame retardancy of the composites were also improved. From the LOI test results, it was observed that the LOI values of PLA biocomposites increased as the percentage of hypophosphites in the JE treatment solution increased. UL-94V and UL-94HB tests indicate that PLA biocomposite reinforced with JEs treated with 10% wt CHP has the highest flame retardancy performance.

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