Effect of chain topological structure on the crystallization, rheological behavior and foamability of TPEE using supercritical CO2 as a blowing agent

2019 ◽  
Vol 147 ◽  
pp. 48-58 ◽  
Author(s):  
Rui Jiang ◽  
Shun Yao ◽  
Yichong Chen ◽  
Tao Liu ◽  
Zhimei Xu ◽  
...  
Keyword(s):  
Rheological Behavior ◽  
Topological Structure ◽  
Supercritical Co2 ◽  
Blowing Agent

scholarly journals Tinjauan karakteristik foam plastik mikroseluler polistirena dengan penambahan aditif pada teknologi superkritis

2018 ◽  
Vol 9 (1) ◽  
pp. 33
Author(s):  
Faidliyah Nilna Minah ◽  
Firman Kurniawansyah ◽  
S Sumarno
Keyword(s):  
Carbon Dioxide ◽  
Cell Density ◽  
Supercritical Co2 ◽  
Cell Diameter ◽  
Coconut Fiber ◽  
Microcellular Foam ◽  
Fiber System ◽  
Average Cell ◽  
Blowing Agent ◽  
Scanning Electron

Processing technology of microcellular plastic represents development of foaming conventional plastic process. The processing of microcellular plastic has been acknowledged as eco-friendly technology because this plastic is produced by the use of benign supercritical carbon dioxide gas as blowing agent. In this work, the samples polystyrene and additive were saturated with supercritical CO2 at various saturation pressures from 10-22 MPa (at around glass transition temperature of 95 oC and 80 oC) When the saturation time was accomplished, the solution was decompressed rapidly into atmospheric pressure. The samples were placed in the vessel heated and completed by flowing of carbon dioxide as cooler gas into the vessel. The samples were characterized to observe volume expansion ratio, cell density, average cell diameter and surface fractured with Scanning Electron Microscopy. The microcellular foam of plastic product of PS system has cell diameter between 3.970-9.933 μm , cell density between 9.14x104 – 6.24x109 cell/ cm3. PS-CaCO3 system has cell diameter between 3.501-8.050 μm, cell density between 3.31x107 – 1.10x1011 cell/cm3, while PS-coconut fiber system hascell diameter between 2.520-8.414 μm, cell density between 1.50x108 -1.60x1010 cell/cm3 at various pressure.Keywords: polystyrene, microcellular foam plastic, supercritical CO2, CaCO3additive, coconut fiber additive.  AbstrakProses pembuatan plastik mikroseluler merupakan pengembangan dari proses pembuatan foam plastik konvensional. Plastik mikroseluler menggunakan fluida superkritis seperti CO2 dan N2 sebagai blowing agent yang ramah terhadap lingkungan, sehingga proses pembuatan foam plastik mikroseluler dikenal sebagai teknologi ramah lingkungan. Penelitian ini menggunakan sampel polistirena yang dicampur dengan partikel kalsium karbonat atau sabut kelapa dengan konsentrasi 5% yang diproses pada kondisi tekanan 10-22 MPa (T = 95 oC dan 80 oC). Setelah kondisi yang diinginkan tercapai dilakukan dekompresi secara mendadak menuju tekanan atmosfer, dan dilanjutkan dengan proses pemanasan, diakhiri dengan mengalirkan gas CO2 sebagai pendingin. Selanjutnya sampel dikarakterisasi untuk mengetahui rasio volume ekspansi foam, densitas sel, diameter rata-rata sel dan struktur foam yang dihasilkan dengan Scanning Electron Microscope. Pada penelitian ini didapatkan pada sistem PS Murni menghasilkan diameter sel antara 3,970-9,933 μm dan densitas sel 9,14x104 - 6,24x109 cell/cm3. Sistem PS-CaCO3 menghasilkan diameter sel antara 3,501-8,050 μm dan densitas sel 3,31x107 - 1,10x1011 cell/cm3, dan pada sistem PS-Sabut kelapa menghasilkan diameter sel antara 2,520-8,414 μm dan densitas sel 1,50x108 - 1,60x1010 cell/cm3 pada berbagai variasi tekanan.Kata kunci : polistirena, foam plastik mikroseluler, CO2 superkritis, aditif CaCO3, aditif sabut kelapa.

Preparation of microporous thermoplastic polyurethane by low-temperature supercritical CO2 foaming

2016 ◽  
Vol 53 (2) ◽  
pp. 135-150 ◽  
Author(s):  
Chien-Chia Chu ◽  
Shu-Kai Yeh ◽  
Sheng-Ping Peng ◽  
Ting-Wei Kang ◽  
Wen-Jeng Guo ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Supercritical Co2 ◽  
Thermoplastic Polyurethane ◽  
Saturation Temperature ◽  
Phenyl Isocyanate ◽  
Blowing Agent ◽  
Soft Segments ◽  
Hard Segments ◽  
Poly Propylene ◽  
Foam Production

Thermoplastic polyurethane possesses many special characteristics. Its flexibility, rigidity, and elasticity can be adjusted by controlling the ratio of soft segments to hard segments. Due to its versatile physical properties, thermoplastic polyurethane is commonly used in transportation, construction, and biomaterials. However, methods for thermoplastic polyurethane foam production using CO2 are still under investigation. We have previously prepared nanoporous thermoplastic polyurethane foam using commercially available thermoplastic polyurethane; however, in this study, thermoplastic polyurethane was synthesized using 4,4′-methylenebis(phenyl isocyanate), poly(propylene glycol) and 1,4-butanediol, without solvents, using a pre-polymer method. The properties of the synthesized thermoplastic polyurethane were characterized by Fourier transform infrared spectroscopy, thermal analysis, and their mechanical properties were measured. The synthesized thermoplastic polyurethane was foamed by batch foaming using supercritical CO2 as the blowing agent. The effect of saturation temperature and saturation time on the cell morphology of the thermoplastic polyurethane foam was examined.

Generation of Porous Microcellular 85/15 poly (DL-Lactide-co-Glycolide) Foams Using Supercritical CO2 for Biomedical Applications

2000 ◽  
Author(s):  
Lakhwant Singh ◽  
Vipin Kumar ◽  
Buddy D. Ratner
Keyword(s):  
Relative Density ◽  
Cell Size ◽  
Supercritical Co2 ◽  
Biomedical Applications ◽  
Saturation Pressure ◽  
Average Cell Size ◽  
Average Cell ◽  
Blowing Agent ◽  
Quench Method

Abstract Porous 85/15 poly (DL-lactide-co-glycolide) or PLGA foams were produced by the pressure quench method using supercritical CO2 as the blowing agent. The effects of saturation pressure and temperature on average cell size and relative density of the resulting foams were studied. Porous PLGA foams were generated with relative densities ranging from 0.107 to 0.232. Foams showed evidence of interconnected cells with porosities as high as 89%. The cell size ranged from 30 to 70 microns.

Sign in / Sign up

Export Citation Format

Share Document