Enhanced Mechanical Properties of Natural Rubber by Block Copolymer-Based Porous Carbon Fibers

2021 ◽  
Author(s):  
Wenqi Zhao ◽  
Zhen Xu ◽  
John Elliott ◽  
Cindy S. Barrera ◽  
Zacary L. Croft ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Natural Rubber ◽  
Carbon Fibers ◽  
Porous Carbon

Controlling the physical and electrochemical properties of block copolymer-based porous carbon fibers by pyrolysis temperature

2020 ◽  
Vol 5 (1) ◽  
pp. 153-165 ◽  
Author(s):  
Zhengping Zhou ◽  
Tianyu Liu ◽  
Assad U. Khan ◽  
Guoliang Liu
Keyword(s):  
Block Copolymer ◽  
Electrochemical Properties ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Pyrolysis Temperature ◽  
Processing Parameter ◽  
Important Processing

Pyrolysis temperature is an important processing parameter that determines the physical and electrochemical properties of block copolymer-based porous carbon fibers.

scholarly journals Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

2020 ◽  
Vol 7 (16) ◽  
pp. 2000507
Author(s):  
Joel Marcos Serrano ◽  
Assad U. Khan ◽  
Tianyu Liu ◽  
Zhen Xu ◽  
Alan R. Esker ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Dye Removal ◽  
Organic Dye

scholarly journals Block copolymer–based porous carbon fibers

2019 ◽  
Vol 5 (2) ◽  
pp. eaau6852 ◽  
Author(s):  
Zhengping Zhou ◽  
Tianyu Liu ◽  
Assad U. Khan ◽  
Guoliang Liu
Keyword(s):  
Activated Carbon ◽  
Block Copolymer ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Microphase Separation ◽  
High Surface ◽  
Electrochemical Energy Storage ◽  
Interconnected Network ◽  
Surface Areas ◽  
Poly Acrylonitrile

Carbon fibers have high surface areas and rich functionalities for interacting with ions, molecules, and particles. However, the control over their porosity remains challenging. Conventional syntheses rely on blending polyacrylonitrile with sacrificial additives, which macrophase-separate and result in poorly controlled pores after pyrolysis. Here, we use block copolymer microphase separation, a fundamentally disparate approach to synthesizing porous carbon fibers (PCFs) with well-controlled mesopores (~10 nm) and micropores (~0.5 nm). Without infiltrating any carbon precursors or dopants, poly(acrylonitrile-block-methyl methacrylate) is directly converted to nitrogen and oxygen dual-doped PCFs. Owing to the interconnected network and the highly optimal bimodal pores, PCFs exhibit substantially reduced ion transport resistance and an ultrahigh capacitance of 66 μF cm−2 (6.6 times that of activated carbon). The approach of using block copolymer precursors revolutionizes the synthesis of PCFs. The advanced electrochemical properties signify that PCFs represent a new platform material for electrochemical energy storage.

scholarly journals Exceptional capacitive deionization rate and capacity by block copolymer–based porous carbon fibers

2020 ◽  
Vol 6 (16) ◽  
pp. eaaz0906 ◽  
Author(s):  
Tianyu Liu ◽  
Joel Serrano ◽  
John Elliott ◽  
Xiaozhou Yang ◽  
William Cathcart ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Ion Transport ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
High Capacity ◽  
Accessible Surface Area ◽  
High Rate ◽  
Capacitive Deionization ◽  
Porous Network ◽  
Hierarchical Porous

Capacitive deionization (CDI) is energetically favorable for desalinating low-salinity water. The bottlenecks of current carbon-based CDI materials are their limited desalination capacities and time-consuming cycles, caused by insufficient ion-accessible surfaces and retarded electron/ion transport. Here, we demonstrate porous carbon fibers (PCFs) derived from microphase-separated poly(methyl methacrylate)-block-polyacrylonitrile (PMMA-b-PAN) as an effective CDI material. PCF has abundant and uniform mesopores that are interconnected with micropores. This hierarchical porous structure renders PCF a large ion-accessible surface area and a high desalination capacity. In addition, the continuous carbon fibers and interconnected porous network enable fast electron/ion transport, and hence a high desalination rate. PCF shows desalination capacity of 30 mgNaCl g−1PCF and maximal time-average desalination rate of 38.0 mgNaCl g−1PCF min−1, which are about 3 and 40 times, respectively, those of typical porous carbons. Our work underlines the promise of block copolymer–based PCF for mutually high-capacity and high-rate CDI.

Influence of ozone treatment on microstructure and mechanical properties of pitch-based short carbon fiber-reinforced natural rubber

2016 ◽  
Vol 49 (3) ◽  
pp. 226-242 ◽  
Author(s):  
Junmei Cheng ◽  
Shugao Zhao
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Natural Rubber ◽  
Carbon Fibers ◽  
Treatment Time ◽  
Interfacial Interaction ◽  
Ozone Treatment ◽  
Effect Of Treatment ◽  
Short Carbon ◽  
Properties Of Composites

Composites of natural rubber (NR) reinforced with short carbon fibers (SCF) were prepared with two-roll open mill. Ozone treatment of carbon fibers was used to improve the interfacial interaction between fiber and matrix through chemical bonding and physical interlocking. The effect of treatment time on morphology and chemical component of SCF surface and mechanical properties of composites were thoroughly discussed. Results indicated that ozone treatment increased the surface roughness and the number of oxygen-containing groups. Compared with untreated SCF, tensile strength of NR-loaded SCF oxidized for 2.5 h reached the maximum values 26.9 MPa, and the increasing rate was 44.6%.

Sign in / Sign up

Export Citation Format

Share Document