scholarly journals Preparation, Structure, and Properties of Modified Asphalt with Waste Packaging Polypropylene and Organic Rectorite

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Youliang Cheng ◽  
QianGang Fu ◽  
Changqing Fang ◽  
Qingling Zhang ◽  
Chan Lu
Keyword(s):  
High Temperature ◽  
Operational Performance ◽  
Melt Blending ◽  
Scanning Calorimetry ◽  
Modified Asphalt ◽  
Blending Method ◽  
Aging Properties ◽  
High Temperature Storage ◽  
Deformation Ability ◽  
Temperature Storage

The modified asphalt with waste packaging polypropylene (WPP) and WPP/organic rectorite (OREC) was prepared by the melt blending method. The effects of OREC on the physical and aging properties of WPP-modified asphalt were studied. The morphologies, microstructure, and thermal properties of WPP-modified asphalt and WPP/OREC-modified asphalt were characterized by fluorescence microscopy, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetry (TG). The results show that the composite-modified asphalt exhibits excellent ductility and plasticity when the contents of WPP and OREC are 4 wt. % and 1.5 wt. %, respectively. The deformation ability, softening point, ductility, and high-temperature storage stability of WPP-modified asphalt can be improved by adding the appropriate content of OREC. It is demonstrated that the composite-modified asphalt has an outstanding operational performance when the content of OREC is in the range of 1.5–2 wt. %. Compared with base asphalt, the high temperature performance of WPP-modified asphalt and WPP/OREC-modified asphalt is also improved significantly.

scholarly journals Investigation on the Short-Term Aging-Resistance of Thermoplastic Polyurethane-Modified Asphalt Binders

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1189 ◽  
Author(s):  
Ruien Yu ◽  
Xijing Zhu ◽  
Maorong Zhang ◽  
Changqing Fang
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
High Speed ◽  
Storage Stability ◽  
Thermoplastic Polyurethane ◽  
Short Term ◽  
Modified Asphalt ◽  
Aging Resistance ◽  
High Temperature Storage ◽  
Temperature Storage

In this reported work, thermoplastic polyurethane (TPU) was used as a reactive polymer modifying agent to prepare a modified-asphalt, using a high-speed shearing method. Physical performance tests of the TPU-modified asphalt were conducted before and after short-term aging, and the aging resistance was examined by the change in materials properties. In addition, low-temperature rheological properties, thermal properties, the high-temperature storage stability, and the aging mechanism of TPU-modified asphalt were also investigated. The results showed that the addition of TPU improved the aging resistance of base asphalt, which was evidenced by the increased penetration ratio and decreased softening point of the asphalt, after aging. Similarly, Fourier Transform infrared (FTIR) spectroscopy results verified that TPU improved the asphalt aging resistance. It was found that the TPU functional groups played a role in improving thermal properties, high-temperature storage stability, and in the dispersion of modified asphalt.

Asphalt Modified by Ethylene-Acrylic Acid Copolymer Ionomers: Fundamental Investigations of Mechanical and Rheological Properties

2021 ◽  
Vol 871 ◽  
pp. 371-378
Author(s):  
Chun Fa Ouyang ◽  
Chun Ye Xu ◽  
Qun Gao ◽  
Wei Li Xue ◽  
Wei Gang Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Acrylic Acid ◽  
Storage Stability ◽  
Rheological Characteristics ◽  
Metal Hydroxides ◽  
Modified Asphalt ◽  
Acid Copolymer ◽  
High Temperature Storage ◽  
Acrylic Acid Copolymer ◽  
Temperature Storage

Ethylene-acrylic acid copolymer (EAA) has been demonstrated to be a suitable additive for modifying the properties of asphalt. EAA mixed with metal hydroxides/oxides form EAA-M ionomers, which increase the polarity of EAA, improving its adhesive properties and affecting its mechanical and rheological characteristics. The present work investigates the mechanical and rheological characteristics of asphalt modified by EAA in conjunction with either Ca (OH)2, NaOH, or ZnO. The high-temperature properties of the modified asphalts, including the softening point, and needle penetration, were evaluated. Rheological characteristics of modified asphalts were investigated by rotary rheometer. Moreover, the storage stability at high temperature, morphology and chemical structure were also analyzed. Results indicate that a 4wt% EAA-M ionomer concentration in the base asphalt is adequate for providing the enhanced properties studied. For an equivalent concentration of EAA, the properties of modified asphalts were affected by very small additions of the metal hydroxides/oxides. The best overall mechanical and rheological performance was obtained for EAA-Ca modified asphalt with 4wt% EAA and 2.5wt‰ Ca (OH)2. EAA-Zn modified asphalt provided the most stable high-temperature storage. Compared with 6wt% pure EAA-modified asphalt, which is not stable, the EAA-Zn modified asphalt (2.7wt‰ ZnO) demonstrated reasonable high-temperature storage stability. Compared with asphalt modified with 6wt% pure EAA, the softening point increased from 55.81 °C to 58.05 °C with the addition of 2.7wt‰ NaOH. However, while the mechanical and rheological properties of EAA-Na modified asphalt were very good, its high-temperature storage stability due to the strong reactivity of NaOH, which led to the crosslinking of EAA-Na ionomers, making it difficult to disperse.

High temperature storage reliability investigation of the Al–Cu wire bond interface

2012 ◽  
Vol 52 (9-10) ◽  
pp. 1966-1970 ◽  
Author(s):  
R. Pelzer ◽  
M. Nelhiebel ◽  
R. Zink ◽  
S. Wöhlert ◽  
A. Lassnig ◽  
...  
Keyword(s):  
High Temperature ◽  
Wire Bond ◽  
High Temperature Storage ◽  
Bond Interface ◽  
Temperature Storage

High Temperature Storage and Gamma Radiation Effects on Mechanical Properties of Stacked Die Package

2014 ◽  
Vol 895 ◽  
pp. 567-570
Author(s):  
Azman Jalar ◽  
Wan Yusmawati Wan Yusoff ◽  
Norinsan Kamil Othman ◽  
Irman Abdul Rahman
Keyword(s):  
High Temperature ◽  
Gamma Radiation ◽  
Radiation Effects ◽  
Storage Period ◽  
Bending Test ◽  
Three Point Bending ◽  
Micromechanical Properties ◽  
3D Ct Scan ◽  
High Temperature Storage ◽  
Temperature Storage

Effect of gamma radiation (1.33 MeV) and high temperature storage of semiconductor package towards micromechanical properties has been investigated. The in-house fabricated Quad Flat No Lead was exposed to gamma radiation with the dose of 5 Gy. Afterwards, high temperature storage was performed at 150 °C for 10, 100 and 1000 hours. Subsequently, the three point bending technique was carried out to obtain the micromechanical properties of semiconductor package. The fracture of the packages caused by three point bending test was subjected to 3D CT scan to capture the image of the fracture. Irradiated package shows the decreasing in their strength with increasing doses of gamma radiation. However, the strength of the package was improved after high temperature storage for 10 hours and decreased as the storage period is extended. Further analysis exhibited that high temperature storage for 10 hours is reveal as good thermal treatment for package in radioactive environment application.

Thermal Stability and Crystallization Behavior of PP/Organoclay Phase Change Composites

2013 ◽  
Vol 785-786 ◽  
pp. 123-126
Author(s):  
Ying Ye ◽  
Kun Yan Wang ◽  
Ge Chang ◽  
Qian Ying Jiang
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Crystallization Behavior ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Nucleation Agent ◽  
Scanning Calorimetry ◽  
Blending Method ◽  
Phase Change Composites ◽  
Change Material

Polypropylene/organoclay modified by dodecanol phase change material were prepared by melt blending method. The thermal stability and crystallization behavior was studied by thermogravimetry (TG), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). TG results indicated the window of processing of PP could be improved by adding small amount organoclay modified by dodecanol to the blend. DSC showed the organoclay modified by dodecanol affected the crystallization behavior of PP as heterogeneous nucleation agent. XRD results show that the organoclay modified by dodecanol does not change the crystal structure in the blends but only decrease the intensity of the diffraction peak.

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