Viscoelastic Behavior and Thermal Stability of Poly(Lactic Acid) Bio‐Composite Filled with Micro‐Graphite

Kaavessina, Mujtahid; Distantina, Sperisa; Shohih, Esa Nur; Lomi, Henry A. S.; Pratiwi, Betha P.; Chafid, Achmad

doi:10.1002/masy.201900140

Cited by 2 publications

(5 citation statements)

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“…At high shear rate, the shear stress and the complex viscosity of all filaments revealed the shear thinning and the values were comparable regardless with the incorporation of additives. These indicated similarity of the PLA mainly matrix in the composite filaments [30]. Figure S1 presents the complex viscosity as a function of angular frequencies, which the viscosity characteristics of the PLA-N and PLA-P were also observed in Benwood et al [5].…”

Section: Rheological Propertiessupporting

confidence: 61%

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Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Thumsorn

Prasong²,

Kurose

et al. 2022

Polymers

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Commercial filaments of poly(lactic acid) (PLA) composites with particulate filler, carbon fiber, and copper powder with different contents were fabricated by FDM 3D printing in XZ-direction at bed temperatures of 45 °C and 60 °C. The effects of additives and bed temperatures on layer adhesion, fracture behavior, and mechanical performance of the PLA composites 3D printing were evaluated. Rheological properties informed viscous nature of all filaments and interface bonding in the PLA composites, which improved printability and dimensional stability of the 3D printing. Crystallinity of the PLA composites 3D printing increased with increasing bed temperature resulting in an improvement of storage modulus, tensile, and flexural properties. On the contrary, the ductility of the 3D printing was raised when printed at low bed temperature. Dynamic mechanical properties, the degree of entanglement, the adhesion factor, the effectiveness coefficient, the reinforcing efficiency factor, and the Cole–Cole analysis were used to understand the layer adhesion, and the interfacial interaction of the composites as compared to the compression molded sheets. SEM images revealed good adhesion between the additives and the PLA matrix. However, the additives induced faster solidification and showed larger voids in the 3D printing, which indicated lower layer adhesion as compared to neat PLA. It can be noted that the combination of the additives and the optimized 3D printing conditions would be obtain superior mechanical performance even layer adhesion has been restricted.

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Section: Rheological Propertiessupporting

confidence: 61%

“…It can be noted that the G' and the loss modulus (G") of PLA-Cu were equally at low frequency. It might inform the combination of solid-liquid transition behavior, which affected on molecular relaxation of the PLA-Cu filament [30]. From the loss modulus, all filaments were similarly in viscous behavior of the PLA matrix.…”

Section: Rheological Propertiesmentioning

confidence: 96%

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Thumsorn

Prasong²,

Kurose

et al. 2022

Polymers

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“…Poli asam laktat adalah polimer biodegradable yang paling berkembang dibandingkan jenis-jenis polimer lainnya sebab polimer ini bersifat termoplastis sehingga mudah dibentuk oleh pemanasan [2]. Poli asam laktat adalah jenis polyester dari asam laktat yang bisa ditemukan pada proses metabolisme tumbuhan dan hewan [2,3]. Sebagian besar asam laktat dihasilkan dari proses fermentasi menggunakan bakteri bergenus Lactobacillus dengan berbagai jenis bahan baku sumber karbon.…”

Section: Pendahuluanunclassified

“…Polimer sendiri merupakan bahan isolator, dan untuk dapat bersifat semikonduktor, suatu bahan konduktor dapat dicampur dengan polimer sehingga membentuk suatu komposit. Komposit polimer konduktif berbahan poli asam laktat telah berhasil disintesis [3]. Komposit ini menggunakan grafit di dalam campurannya.…”

Section: Pendahuluanunclassified

“…Bahan yang digunakan adalah lembaran komposit poli asam laktat/grafit dengan penambahan grafit 0%, 0,5%, 1% dan 1,5%. Komposit poli asam laktat/grafit diperoleh dari salah satu penulis dengan proses pembuatan yang sama seperti dijelaskan oleh Kaavessina [3]. Garam yaitu natrium klorida (NaCl), kalium fosfat (K2SO4), kalium klorida (KCl), barium klorida (BaCl2), kalium hidroksida (KOH), magnesium klorida (MgCl2), dan magnesium nitrat (Mg(NO 3)2) diperoleh dari Merck.…”

Section: Bahan Dan Metode 21 Bahanunclassified

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Isotherm Adsorbsi Uap Air Komposit Poli(asam laktat) - Grafit

et al. 2022

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ABSTRAK.Poli asam laktat adalah polimer hidrofobik yang termasuk dalam kelas biomaterial yang bersifat biodegradable. Poli asam laktat berpotensi untuk dijadikan komposit polimer konduktif (conductive polymer composite - CPC) yang dipergunakan sebagai bahan semikonduktor dengan cara mencampurkan grafit kepadanya. Perilaku adsorpsi uap air perlu dipelajari untuk mengetahui stabilitas komposit dan ditunjukkan melalui kurva isotherm adsorpsi uap air. Tujuan dari penelitian ini adalah mempelajari isotherm adsorpsi uap air komposit poli asam laktat/grafit pada berbagai komposisi grafit. Pengamatan terhadap isotherm adsorpsi uap air dilakukan dengan metode gravimetri pada berbagai kondisi kelembaban relatif. Hasil yang diperoleh menunjukkan bahwa kurva isotherm mengikuti tipe II menurut kasifikasi Brunauer, yaitu kurva berbentuk sigmoidal. Semakin tinggi kondisi kelembaban relatif, semakin besar kandungan air kesetimbangan. Peningkatan kandungan air kesetimbangan secara tajam terjadi pada kondisi kelembaban di atas 75%. Semakin tinggi komposisi grafit, semakin besar kandungan uap air kesetimbangan. Data kesetimbangan dicocokkan dengan model kesetimbangan sorpsi uap air yaitu model Guggenhiem-Anderson-deBoer (GAB), model Peleg, dan model Oswin. Model GAB memberikan gambaran isotherm yang terbaik.Kata kunci:adsorpsi uap air, kesetimbangan, komposit, poli asam laktat/grafit, pemodelan ABSTRACT. Poly(lactic acid)/PLA is a hydrophobic polymer that belongs to the class of biodegradable biomaterial. PLA can be used as material in the manufacture of conductive polymer composite (CPC), which is used as a semiconductor material by mixing graphite into it. The water vapor adsorption behavior needs to be studied to determine the stability of the composite. This research aims to investigate the water vapor adsorption isotherm in poly(lactic acid)/graphite composites on various graphite compositions. The gravimetric method carried observations on the water vapor adsorption isotherm at various relative humidity conditions. The results obtained indicate that the isotherm curve follows type II according to the Brunauer classification. The higher the relative humidity, the greater the equilibrium water content. A sharp increase in the equilibrium water content occurs at humidity conditions above 75%. The higher the graphite composition, the greater the equilibrium moisture content. The Guggenhiem-Anderson-deBoer (GAB), Peleg, and Oswin sorption models were used to fit the experimental data. The GAB model best described the isotherms of the composites.Keywords:composite, equilibrium, modeling, poly(lactic acid)/ graphite, water vapor adsorption

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Viscoelastic Behavior and Thermal Stability of Poly(Lactic Acid) Bio‐Composite Filled with Micro‐Graphite

Cited by 2 publications

References 24 publications

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Isotherm Adsorbsi Uap Air Komposit Poli(asam laktat) - Grafit

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