Distinct positive temperature coefficient effect of polymer–carbon fiber composites evaluated in terms of polymer absorption on fiber surface

2016 ◽  
Vol 18 (11) ◽  
pp. 8081-8087 ◽  
Author(s):  
Xi Zhang ◽  
Shaodi Zheng ◽  
Xiaofang Zheng ◽  
Zhengying Liu ◽  
Wei Yang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Temperature Coefficient ◽  
High Density Polyethylene ◽  
Fiber Surface ◽  
Fiber Composites ◽  
Positive Temperature Coefficient ◽  
High Density ◽  
Carbon Fiber Composites ◽  
Positive Temperature ◽  
Ptc Effect

The positive temperature coefficient (PTC) effect for high-density polyethylene (HDPE)/carbon fiber (CF) composites was studied.

Influence of CF on PTC Properties of LDPE/Carbon Fiber Composites

2014 ◽  
Vol 1056 ◽  
pp. 20-24 ◽  
Author(s):  
Wen Long Zhang ◽  
Yu Ping Wan ◽  
Ya Jie Dai ◽  
Yan Gao ◽  
Chen Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Temperature Coefficient ◽  
Low Cost ◽  
Negative Temperature ◽  
Treatment Method ◽  
Positive Temperature Coefficient ◽  
Carbon Fiber Composites ◽  
Positive Temperature ◽  
Short Lifespan ◽  
Cost Characteristics

PO/CB (Polyolefin/Carbon Black) PTC (Positive Temperature Coefficient) composite with easy processing, low cost characteristics has been applied widely. But it suffered from a relatively short lifespan because of its NTC (Negative Temperature Coefficient) effect and low PTC intensity. In order to overcome this shortcoming, the CF was calcination-treated to prepare LDPE/CF (Low Density Polyethylene/Carbon Fiber) PTC composite. Influence of length, content and treatment method of CF on PTC properties of composites was investigated. Results showed that 0.5mm length CF in composites had higher PTC intensity than that of 2mm length CF. PTC intensity of the composites was enhanced more effectively by calcination treated CF compared to the untreated CF. The maximum PTC intensity was 8.1 when CF’s content was at 8wt%.

Positive Temperature Coefficient Behavior of the Graphite Nanofibre and Carbon Black Filled High-Density Polyethylene Hybrid Composites

2008 ◽  
Vol 47-50 ◽  
pp. 226-229 ◽  
Author(s):  
Qi Li ◽  
Jong Wan Kim ◽  
Tae Hee Shim ◽  
Yun Ki Jang ◽  
Joong Hee Lee
Keyword(s):  
Carbon Black ◽  
Temperature Coefficient ◽  
High Density Polyethylene ◽  
Hybrid Composites ◽  
Positive Temperature Coefficient ◽  
High Density ◽  
Hybrid Nanocomposites ◽  
Room Temperature Resistivity ◽  
Positive Temperature ◽  
Temperature Resistivity

The graphite nanofiber (GNF) and carbon black filled high-density polyethylene (HDPE) hybrid nanocomposites were prepared by solution mixing and melt blending techniques. The effect of addition of GNF on the positive temperature coefficient (PTC) behavior of the nanocomposites was investigated. The incorporation of small amount of GNF into HDPE/CB composites showed a significant improvement in PTC intensity and repeatability of the hybrid nanocomposites. The maximum PTC intensity was observed for the HDPE/CB/GNF (80/20/0.25) nanocomposite with a relatively low room temperature resistivity.

Tunable temperature-resistivity behaviors of carbon black/polyamide 6 /high-density polyethylene composites with conductive electrospun PA6 fibrous network

2018 ◽  
Vol 53 (14) ◽  
pp. 1897-1906 ◽  
Author(s):  
Yingying Qu ◽  
Ping Xu ◽  
Hu Liu ◽  
Qianming Li ◽  
Ning Wang ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Polymer Composites ◽  
High Density Polyethylene ◽  
Conductive Polymer ◽  
Polyamide 6 ◽  
Positive Temperature Coefficient ◽  
High Density ◽  
Positive Temperature ◽  
Conductive Polymer Composites ◽  
Temperature Resistivity

Temperature-resistivity behaviors of carbon black/polyamide 6/high-density polyethylene conductive polymer composites containing electrospun polyamide 6 fibrous network were studied systematically. The positive temperature coefficient intensity of the conductive polymer composites increased firstly and then reduced gradually with increasing heating rate, showing a heating rate-dependent positive temperature coefficient intensity. The fascinating phenomenon was ascribed to the microstructure change of conductive network induced by the volume expansion and the thermal residual stress generated in the composites. During the heating-cooling runs at different top testing temperature of 140, 150 and 180℃, the room-temperature resistivity of sample was observed to be 30, 2.3 and 1.6 orders of magnitude higher than the initial value after one heating-cooling run, respectively. The thermal treatment time above the melting temperature of high-density polyethylene and the viscosity variation of the conductive polymer composites were responsible for the increased resistivity. This study provides a guideline for fabricating conductive polymer composites with tuning positive temperature coefficient property.

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