Effect of chain structure on the thermal conductivity of expanded graphite/polymer composites

RSC Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 10185-10191 ◽  
Author(s):  
Sha Deng ◽  
Jinwen Wang ◽  
Guiying Zong ◽  
Feng Chen ◽  
Songgang Chai ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Polymer Composites ◽  
Polymer Chain ◽  
Expanded Graphite ◽  
Chain Structure

The thermal conductivity of expanded graphite (EG)/polymer composites is investigated in terms of polymer chain structures.

scholarly journals Sustainability Assessment and Techno-Economic Analysis of Thermally Enhanced Polymer Tube for Multi-Effect Distillation (MED) Technology

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 681
Author(s):  
Furqan Tahir ◽  
Abdelnasser Mabrouk ◽  
Sami G. Al-Ghamdi ◽  
Igor Krupa ◽  
Tomas Sedlacek ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Polymer Composites ◽  
Environmental Impacts ◽  
Polymer Composite ◽  
Expanded Graphite ◽  
The Other ◽  
Metal Alloys ◽  
Composite Tubes ◽  
Other Hand ◽  
The Cost

Metal-alloys tubes are used in the falling-film evaporator of the multi-effect distillation (MED) that is the dominant and efficient thermal seawater desalination process. However, the harsh seawater environment (high salinity and high temperature) causes scale precipitation and corrosion of MED evaporators’ metal tubes, presenting a serious technical challenge to the process. Therefore, the metal/metal alloys used as the material of the MED evaporators’ tubes are expensive and require high energy and costly tube fabrication process. On the other hand, polymers are low-cost, easy to fabricate into tubes, and highly corrosion-resistant, but have low thermal conductivity. Nevertheless, thermally conductive fillers can enhance the thermal conductivity of polymers. In this article, we carried out a feasibility-study-based techno-economic and socioeconomic analysis, as well as a life-cycle assessment (LCA), of a conventional MED desalination plant that uses titanium tubes and a plant that used thermally enhanced polymer composites (i.e., polyethylene (PE)-expanded graphite (EG) composite) as the tubes’ material. Two different polymer composites containing 30% and 40% filler (expanded graphite/graphene) are considered. Our results indicate that the MED plant based on polymer composite tubes has favored economic and carbon emission metrics with the potential to reduce the cost of the MED evaporator (shell and tubes) by 40% below the cost of the titanium evaporator. Moreover, the equivalent carbon emissions associated with the composite polymer tubes’ evaporator is 35% lower than titanium tubes. On the other hand, the ozone depletion, acidification, and fossil fuel depletion for the polymer composite tubes are comparable with that of the titanium tubes. The recycling of thermally enhanced polymers is not considered in this LCA analysis; however, after the end of life, reusing the polymer material into other products would lower the overall environmental impacts. Moreover, the polymer composite tubes can be produced locally, which will not only reduce the environmental impacts due to transportation but also create jobs for local manufacturing.

Study of Transcrystallization in Polymer Composites

1989 ◽  
Vol 170 ◽  
Author(s):  
Benjamin S. Hsiao ◽  
J. H. Eric
Keyword(s):  
Thermal Conductivity ◽  
Free Energy ◽  
Carbon Fiber ◽  
Plasma Treatment ◽  
Polymer Composites ◽  
High Performance ◽  
Interfacial Strength ◽  
Fiber Surface ◽  
Semicrystalline Polymers ◽  
First Case

AbstractTranscrystallization of semicrystalline polymers, such as PEEK, PEKK and PPS, in high performance composites has been investigated. It is found that PPDT aramid fiber and pitch-based carbon fiber induce a transcrystalline interphase in all three polymers, whereas in PAN-based carbon fiber and glass fiber systems, transcrystallization occurs only under specific circumstances. Epitaxy is used to explain the surface-induced transcrystalline interphase in the first case. In the latter case, transcrystallization is probably not due to epitaxy, but may be attributed to the thermal conductivity mismatch. Plasma treatment on the fiber surface showed a negligible effect on inducing transcrystallization, implying that surface-free energy was not important. A microdebonding test was adopted to evaluate the interfacial strength between the fiber and matrix. Our preliminary results did not reveal any effect on the fiber/matrix interfacial strength of transcrystallinity.

Aluminum Borate/Boron Nitride Nanosheet Fibers for Enhancing the Thermal Conductivity of Polymer Composites

2021 ◽  
Vol 4 (2) ◽  
pp. 2136-2142
Author(s):  
Xiao Hou ◽  
Zhenbang Zhang ◽  
Xianzhe Wei ◽  
Yue Qin ◽  
Guichen Song ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Polymer Composites ◽  
Aluminum Borate ◽  
Boron Nitride Nanosheet

An investigation on thermal conductivity of constructal-filler polymer composites

2021 ◽  
Vol 126 ◽  
pp. 105411
Author(s):  
Xiaojian Wang ◽  
Wensheng Kang ◽  
Xiaohu Niu ◽  
Xiaoxue Wang ◽  
Liangbi Wang
Keyword(s):  
Thermal Conductivity ◽  
Polymer Composites
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