Characterization of Bisphenol a Poly(Carbonate) after Multiple Processing Cycles

2010 ◽  
Vol 146-147 ◽  
pp. 713-719
Author(s):  
Xia Gao ◽  
Qin Yong Mi ◽  
Wei Zhang ◽  
Zhao Hui Wang ◽  
Tong Na Mu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Bisphenol A ◽  
Melt Flow Index ◽  
Flow Index ◽  
Processing Conditions ◽  
Screw Extruder ◽  
Twin Screw ◽  
Multiple Processing ◽  
Poly Carbonate

Bisphenol A poly(carbonate) (PC) pellets used for production of 5 gallon drink water bottles were reprocessed in a twin-screw extruder for three processing cycles which simulated to those of PC bottle processing conditions. The reprocessed PC pellets were characterized by its mechanical, rheological, thermal, and optical properties. It was found that the mechanical properties of the reprocessed PC samples are slightly decreased after reprocessed. Whereas no further change was observed for the rheological and thermal properties and molecule weight of the PC samples after the second reprocessing cycles. Moreover, the melt flow index, color, and optical properties changed obviously after two reprocessing cycles.

Tuning of HDPE Properties for 3D Printing

2018 ◽  
Vol 773 ◽  
pp. 67-71 ◽  
Author(s):  
Paweesinee Chatkunakasem ◽  
Panisa Luangjuntawong ◽  
Aphiwat Pongwisuthiruchte ◽  
Chuanchom Aumnate ◽  
Pranut Potiyaraj
Keyword(s):  
3D Printing ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Crystalline Polymers ◽  
Twin Screw ◽  
Low Crystalline

The objective of this study is to improve high density polyethylene (HDPE) properties for 3D printing by addition of graphene and low density polyethylene (LDPE). Graphene was prepared by modified Hummer’s method. The prepared graphene was characterized by the infrared spectroscopy and the X-ray diffraction analysis (XRD). Graphene/HDPE and LDPE/HDPE composites were successfully prepared through the melt-blending technique using a twin-screw extruder. The melt flow index (MFI) and differential scanning calorimetry (DSC) were employed to characterize neat HDPE and the modified HDPE. FTIR and XRD results show that graphite was successfully changed into graphene completely and MFI of graphene/HDPE and LDPE/HDPE decreased as the amount of graphene and LDPE in the composite blends increased. DSC results show that the addition of low crystalline polymers can reduce a crystallization temperature and crystallinity content.

Tensile Properties and Degradability of Polyvinyl Alcohol and Starch Succinate Blend

2015 ◽  
Vol 1113 ◽  
pp. 122-126
Author(s):  
Mohd Muizz Fahimi bin Mohamed ◽  
Rahmah Mohamed
Keyword(s):  
Polyvinyl Alcohol ◽  
Tensile Properties ◽  
Sun Exposure ◽  
Melt Flow Index ◽  
Visual Observation ◽  
Flow Index ◽  
Screw Extruder ◽  
Soil Burial ◽  
Twin Screw ◽  
Flow Modifier

The purpose of this study was to determine the tensile properties of biodegradable Polyvinyl Alcohol (PVA) impregnated with commercial grade starch succinate (SS). PVA is a hydrophilic and hygroscopic polymer, and inclusion of SS reduces PVA's hygroscopicity and hydrophilicity. The compounding of PVA with SS was prepared by using a twin screw extruder with fixed flow modifier. The ratios of SS were varied between 5% to 20%. Melt flow index, tensile properties, soil burial and sun exposure degradability were investigated in this study. Tensile strength was observed to increase proportionate to the amount of SS incorporated while the blends were found to have greater flexibility as their elongation increases as their modulus dropped. SS was found to have greater flexibility chain which imparted greater elongation during stretching test. Higher content of SS was found to impart better degradation rate as derived from visual observation of the samples exposed to sunlight and soil burial.

Effect of Flow Fields on Morphology of PP/Nano/CaCO3 Composite and Its Rheological Behavior

Materials ◽  
2005 ◽  
Author(s):  
Han-Xiong Huang ◽  
Guo Jiang ◽  
Shan-Qiang Mao
Keyword(s):  
Crystallization Behavior ◽  
Filler Content ◽  
Melt Flow Index ◽  
Flow Fields ◽  
Flow Index ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Twin Screw

Polypropylene (PP)/nano-calcium carbonate (nano-CaCO3) composite was prepared using a co-rotating, intermeshing twin-screw extruder. The effect of flow fields on the morphology of the nanocomposite was investigated. Transmission electron microscopy (TEM) was used for the determination of the morphology in the nanocomposite. The crystallization behavior of the nanocomposite was studied by using differential scanning calorimetry (DSC) and the melt shear viscosity was investigated by a melt flow index tester. The study showed that the flow field, through appropriately combining the type of the screw elements in this work, plays an important role in developing morphology of the nanocomposite. In addition, it was shown that the melt viscosity for the nanocomposite at the filler content less than 10 wt% is lower than that of neat PP.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

scholarly journals Characterization of twin-screw-extruder-compounded polycarbonate nanoclay composites

2008 ◽  
Vol 49 (4) ◽  
pp. 631-640 ◽  
Author(s):  
Katja Nevalainen ◽  
Jyrki Vuorinen ◽  
Vesa Villman ◽  
Reija Suihkonen ◽  
Pentti Järvelä ◽  
...  
Keyword(s):  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw

Research of Preparation and Characterization of PP/EPDM/CaS Composites

2011 ◽  
Vol 71-78 ◽  
pp. 640-643
Author(s):  
Ming Zhao ◽  
Xiao Zhong Lu ◽  
Kai Gu ◽  
Xiao Min Sun ◽  
Chang Qing Ji
Keyword(s):  
Tensile Strength ◽  
Particle Shape ◽  
Calcium Silicate ◽  
Honeycomb Structure ◽  
Melt Processing ◽  
Ethylene Propylene Diene Monomer ◽  
Screw Extruder ◽  
Twin Screw ◽  
Heat Deflection Temperature

A series of polypropylene/ethylene-propylene-diene monomer / calcium silicate (PP/EPDM/CaS) composites with different contents was prepared by melt processing using a twin-screw extruder. The composites were characterized. The results showed the particle shape of calcium silicate is honeycomb structure . The heat deflection temperature of PP/EPDM/CaS composite increased with increasing CaS content. The composites had highest tensile strength and the lowest when CaS content was 9.5 phr and 35 phr respectively.

Thermal and Thermorheologic Characterization of Different Polyolefin Waste Fractions

2017 ◽  
Vol 907 ◽  
pp. 74-79
Author(s):  
Adela Lazar ◽  
Catalin Croitoru ◽  
Mircea Horia Tierean ◽  
Liana Sanda Baltes
Keyword(s):  
Molecular Mass ◽  
High Density Polyethylene ◽  
Melt Flow Index ◽  
Household Waste ◽  
Flow Index ◽  
Melt Flow ◽  
Polymer Waste ◽  
Lower Molecular Mass ◽  
Low Shear

In this study, melt flow index values from several household waste fractions containing mainly polypropylene and high-density polyethylene, were measured at 190 °C for polyethylene and 230 °C for polypropylene-rich fractions. High values of MFI (low shear viscosities) have been reported probably due to the lower molecular mass of the polymer waste and/or the presence of surfactant compounds on the surface of the polymer flakes. Also, by extruding the same batch in different cycles at the same temperature values, the number of processing cycles on which the polymer could be recycled has been determined.

On secondary recycling of ZrO2-reinforced HDPE filament prepared from domestic waste for possible 3-D printing of bearings

2019 ◽  
pp. 089270571986462 ◽  
Author(s):  
Rupinder Singh ◽  
Ranvijay Kumar ◽  
Shubham Tiwari ◽  
Shubham Vishwakarma ◽  
Shivam Kakkar ◽  
...  
Keyword(s):  
Acrylonitrile Butadiene Styrene ◽  
Melt Flow Index ◽  
Melt Processing ◽  
Thermoplastic Composites ◽  
Flow Index ◽  
Wear Properties ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Recycled Hdpe

In this study, an innovative route for secondary recycling (with zirconium oxide (ZrO2) reinforcement) has been proposed based on melt processing of high-density polyethylene (HDPE) in low-temperature bearing applications. Initially, secondary recycled HDPE, acrylonitrile butadiene styrene, and nylon 6 thermoplastic composites were investigated for melt flow index (MFI) according to ASTM D1238 standard. Based on the acceptable MFI, secondary recycled HDPE matrix was selected for second-stage processing on twin screw extrusion (TSE). The final process involves reinforcement of ZrO2 into HDPE matrix by TSE in 60:40 ratio (by weight %) for preparation of feedstock filament (for possible 3-D printing of bearings). The results of the study suggest that for processing of HDPE, 40% ZrO2 composite matrix, 50 r min−1 screw speed, 190°C barrel temperature, and 15 kg applied load are the best setting of TSE (for maximizing the tensile strength of feedstock filament). The results are also supported by wear properties, thermal stability, and morphological analysis (based on scanning electron microscopy and electron-dispersive X-ray analysis).

Sign in / Sign up

Export Citation Format

Share Document