Laser induced graphene for in situ damage sensing in aramid fiber reinforced composites

2021 ◽  
Vol 201 ◽  
pp. 108541 ◽  
Author(s):  
LoriAnne Groo ◽  
Jalal Nasser ◽  
Daniel Inman ◽  
Henry Sodano
Keyword(s):  
Aramid Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Damage Sensing

Sulfone-functionalized poly(p-phenylene terephthalamide) copolymer fibers with improved interfacial adhesion to epoxy matrices

2021 ◽  
pp. 095400832110089
Author(s):  
Ting Li ◽  
Zengxiao Wang ◽  
Hao Zhang ◽  
Yutong Cao ◽  
Zuming Hu ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Aramid Fiber ◽  
Fiber Reinforced Composites ◽  
Epoxy Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Regular Arrangement ◽  
Epoxy Matrices ◽  
Polymerization Conditions

The poor interfacial adhesion of aramid fiber and matrix limits the application of the final composites. In this study, a series of the sulfone-functionalized poly( p-phenylene terephthalamide) (SPPTA) copolymers were satisfactorily synthesized and the effects of polymerization conditions (contents of the additional monomer and the cosolvent LiCl, molar concentration and ratio of the monomer, reaction temperature and time) on the molecular weight of the copolymer were discussed. The introduction of the sulfone group in aromatic polyamides not only increased the polarity of poly( p-phenylene terephthalamide) (PPTA) but destroyed the regular arrangement of the molecular chains, which greatly improved the surface free energy and the solubility of the polymers in organic solvents. The polymer maintained excellent thermal and interfacial properties. Compared with the PPTA fiber/epoxy composites, the interfacial shear strength (IFSS) of SPPTA fiber-reinforced epoxy composites reached 43.5 MPa, with a significantly enhancement of 20.8%, implying that the study provided an effective method to achieve highly interfacial adhesion of aramid fiber-reinforced composites.

Water-resistant hemp fiber-reinforced composites: In-situ surface protection by polyethylene film

2018 ◽  
Vol 112 ◽  
pp. 210-216 ◽  
Author(s):  
Yingji Wu ◽  
Changlei Xia ◽  
Liping Cai ◽  
Sheldon Q. Shi ◽  
Jiangtao Cheng
Keyword(s):  
Fiber Reinforced Composites ◽  
Polyethylene Film ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Hemp Fiber ◽  
Surface Protection
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