[논문]Effects of maleic anhydride content on mechanical properties of carbon fibers-reinforced maleic anhydride-grafted-poly-propylene matrix composites

Kim, Hyun-Il; Han, Woong; Choi, Woong-Ki; Park, Soo-Jin; An, Kay-Hyeok; Kim, Byung-Joo

doi:10.5714/cl.2016.20.039

[국내논문] Effects of maleic anhydride content on mechanical properties of carbon fibers-reinforced maleic anhydride-grafted-poly-propylene matrix composites 원문보기

Carbon letters, v.20, 2016년, pp.39 - 46

Kim, Hyun-Il (R&D Division, Korea Institute of Carbon Convergence Technology) , Han, Woong (R&D Division, Korea Institute of Carbon Convergence Technology) , Choi, Woong-Ki (R&D Division, Korea Institute of Carbon Convergence Technology) , Park, Soo-Jin (Department of Chemistry, Inha University) , An, Kay-Hyeok (Department of Nano & Advanced Materials Engineering, Jeonju University) , Kim, Byung-Joo (R&D Division, Korea Institute of Carbon Convergence Technology)

Abstract ▼ AI-Helper

In this work, the effects of maleic anhydride (MA) content on mechanical properties of chopped carbon fibers (CFs)-reinforced MA-grafted-polypropylene (MAPP) matrix composites. A direct oxyfluorination on CF surfaces was applied to increase the interfacial strength between the CFs and MAPP matrix. The mechanical properties of the CFs/MAPP composites are likely to be different in terms of MA content. Surface characteristics were observed by scanning electron microscope, Fourier transform infrared spectroscopy, and single fiber contact angle method. The mechanical properties of the composites were also measured by a critical stress intensity factor (KIC). From the KIC test results, the KIC values were increased to a maximum value of 3.4 MPa with the 0.1 % of MA in the PP, and then decreased with higher MA content.

Keyword

AI 본문요약
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문제 정의

The objective of this work is to investigate and compare the effects of MA content on mechanical properties of oxyfluorinated carbon fibers-reinforced MAPP matrix composites. The mechanical and morphological properties of carbon fibers/MAPP composites are likely to be different from those of MAPP in terms of MA content.

대상 데이터

Carbon fibers (TANSOME, H2550, 12K; Hyosung, Seoul, Korea) were used as a reinforcing material and the properties in detain were listed in Table 1. The fluorine gas used was supplied from Messer Griesheim GmbH, Bad Soden, Germany (purity 99.8%, balanced by nitrogen gas). The types of MAPP (Homan Petrochemical Co.
Carbon fibers (TANSOME, H2550, 12K; Hyosung, Seoul, Korea) were used as a reinforcing material and the properties in detain were listed in Table 1. The fluorine gas used was supplied from Messer Griesheim GmbH, Bad Soden, Germany (purity 99.

이론/모형

The mechanical interfacial properties of the composites were investigated using the analytical expression for KIC and were characterized using a single-edge notched (SEN) beam fracture toughness test in 90° three-point bending flexure. The SEN beam fracture toughness test was conducted on an Instron model universal testing machine (Lloyd; Hamphshire, UK) mechanical tester according to the ASTM E-399. A span-to-depth ratio of 4:1 and a crosshead speed of 1 mm/min were used.

성능/효과

Because the structure of PP consists of organized non-polar hydrocarbon chains, PP generally have very poor wettability against polar solvents. While, after the MA reaction, it was observed that the oxygen functional group was formed at the interface by reaction between PP and MA, such polar component tended to grow with the MA contents. This result indicates that the surface of MAPP were converted to the polar surface, resulting in polar functional group increases after MA reaction as also confirmed by Fig.
9. But, the KIC value of OFCFsMA20 were decreased. These results can be thinkable that the KIC value decreased were indicates that the surface of PP were covered with excessive MA may form a weak layer resulting in decrease in interfacial adhesion due to the formation of new weak interface between the carbon fiber and matrices.
This study showed an increase on mechanical properties of composites as a result of the addition of MA modified PP to carbon fiber-reinforced MAPP composites. The oxyfluorination introduced much higher oxygen and fluorine content on the fiber surface increase to the surface free energy including polar and dispersive component of carbon fibers than as-received carbon fiber.
This study showed an increase on mechanical properties of composites as a result of the addition of MA modified PP to carbon fiber-reinforced MAPP composites. The oxyfluorination introduced much higher oxygen and fluorine content on the fiber surface increase to the surface free energy including polar and dispersive component of carbon fibers than as-received carbon fiber. The structure of PP consists of organized non-polar hydrocarbon chains, and PP generally have very poor wettability.
The oxyfluorination introduced much higher oxygen and fluorine content on the fiber surface increase to the surface free energy including polar and dispersive component of carbon fibers than as-received carbon fiber. The structure of PP consists of organized non-polar hydrocarbon chains, and PP generally have very poor wettability. While, after the MA reaction, it was observed that the oxygen functional group was formed at the interface by reaction between PP and MA, such polar component tended to grow with the MA contents.
But, the KIC value of OFCFsMA20 were decreased. It was probably due to excessive MA-contents can be decreased mechanical properties of composites. In conclusion, surface treatment of carbon fiber and modified matrix plays an important role in improving the adhesion between fiber and matrix.
It was probably due to excessive MA-contents can be decreased mechanical properties of composites. In conclusion, surface treatment of carbon fiber and modified matrix plays an important role in improving the adhesion between fiber and matrix. The degree of polarity was improved by incorporating a MAPP.
In conclusion, surface treatment of carbon fiber and modified matrix plays an important role in improving the adhesion between fiber and matrix. The degree of polarity was improved by incorporating a MAPP. The addition of MAPP led to the enhancement of the fiber/matrix interfacial adhesion and hence mechanical properties.
The degree of polarity was improved by incorporating a MAPP. The addition of MAPP led to the enhancement of the fiber/matrix interfacial adhesion and hence mechanical properties.
While, after the MA reaction, it was observed that the oxygen functional group was formed at the interface by reaction between PP and MA, such polar component tended to grow with the MA contents. In conclusion, mechanical properties was found that KIC value increased up to the samples treated at OFCFsMA10. But, the KIC value of OFCFsMA20 were decreased.

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