The Effect of Surface Modification of Polytetrafluoroethylene (PTFE) on the Properties of POM/PTFE Fiber Composites

2015 ◽  
Vol 642 ◽  
pp. 253-258 ◽  
Author(s):  
Chi Yuan Huang ◽  
Mei Chuan Kuo ◽  
Min Lih Roan
Keyword(s):  
Surface Modification ◽  
Plasma Polymerization ◽  
Frictional Coefficient ◽  
Fiber Composites ◽  
Wear Factor ◽  
Grafting Polymerization ◽  
Plasma Grafting ◽  
Ptfe Composites ◽  
The Impact ◽  
Effect Of Surface

Surface modification of polytetrafluoroethylene (PTFE) fiber by plasma grafting polymerization with acrylamide (AAm) was studied to improve the compatibility between polyacetal (POM) and PTFE. The best modified PTFE manufactured by self-designed plasma polymerization was investigated and denoted as AAm (20wt%)-g (plasma 30min)-PTFE. The grafting polymerization is successful and shown by ESCA spectra of modified PTFE fibers. It is also proved by SEM photographs and the improvement of properties of the POM/PTFE composites. As a result, the friction coefficients, Taber wear factors, and impact strengths of composites with 85wt% of POM and 15wt% of a variety of PTFEs were investigated. The frictional coefficient of POM/ AAm (20wt%)-g (plasma 30min)-PTFE deceased to 0.162; while that of POM/PTFE was 0.174. Taber wear factor of the composite significantly decreased from 5.2 to 1.5 when the PTFE was replaced by AAm-g (plasma)-PTFE. Meanwhile, the impact strength increased from 6.1 kg-cm/cm (POM/PTFE) to 9.3kg-cm/cm (POM/ AAm-g (plasma)-PTFE). Besides, the multi-yield behaviors were found in the Stress-Strain curves of composites with modified PTFE fibers.

scholarly journals Chemical bonding of polycaprolactone on the surface of hydroxyapatite via silanization and ring opening polymerization

2020 ◽  
Vol 19 (2) ◽  
pp. 154-164
Author(s):  
Nadir Slimani ◽  
Giovanni Dal Poggetto ◽  
Paola Laurienzo ◽  
Dalila Ksouri ◽  
Hafit Khireddine
Keyword(s):  
Surface Modification ◽  
Reaction Time ◽  
Ring Opening ◽  
Secondary Phase ◽  
Ring Opening Polymerization ◽  
Tem Analysis ◽  
No Formation ◽  
Waxs Pattern ◽  
The Impact ◽  
Effect Of Surface

In this study, surface modification of hydroxyapatite (HAp) by grafting polycaprolactone (PCL) is described. This method is carried out into two steps: (1) A treatment of HAp powder with a mixture of tetraorthosilicate (TEOS) and 3-aminopropyl-etriethoxysilane (APTES) to introduce amine groups and enhance nucleophilicity of surface functionalities; (2) Initiation of the Ring Opening Polymerization (ROP) of the ε-caprolactone (CL) in the presence of the silanized HAp. Moreover, the impact of the reaction time (24, 48 and 72 h) on the grafting amount of PCL is performed. The results of FTIR analysis confirmed the presence of carbonyl groups on the silanized HAp, providing evidence of grafting of PCL on the HAp surface. WAXS pattern showed no formation of a secondary phase after surface modification and the crystallinity is preserved. SEM/TEM analysis revealed a homogenous surface powder composed of irregular nanoscale crystals. TGA analysis indicated the dependence of PCL graft amount on the reaction time. Finally, the effect of surface modification on HAp/PCL nanocomposites morphology was investigated.

scholarly journals Effect of Surface Modification with Titanate Coupling Agent on Properties of Polypropylene/Vapor Grown Carbon Fiber Composites

2014 ◽  
Vol 60 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Watthanaphon CHEEWAWUTTIPONG ◽  
Noriaki WASHIDA ◽  
Shuichi TANOUE ◽  
Hideyuki UEMATSU ◽  
Yoshiyuki IEMOTO
Keyword(s):  
Surface Modification ◽  
Carbon Fiber ◽  
Coupling Agent ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Effect Of Surface

scholarly journals Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2264
Author(s):  
Raphael H. M. Reis ◽  
Fabio C. Garcia Filho ◽  
Larissa F. Nunes ◽  
Veronica S. Candido ◽  
Alisson C. R. Silva ◽  
...  
Keyword(s):  
Fiber Composite ◽  
Impact Resistance ◽  
Fiber Composites ◽  
Epoxy Composites ◽  
Impact Performance ◽  
Electron Microscopy Analysis ◽  
Ballistic Properties ◽  
Microscopy Analysis ◽  
Izod Impact ◽  
The Impact

Fibers extracted from Amazonian plants that have traditionally been used by local communities to produce simple items such as ropes, nets, and rugs, are now recognized as promising composite reinforcements. This is the case for guaruman (Ischinosiphon körn) fiber, which was recently found to present potential mechanical and ballistic properties as 30 vol% reinforcement of epoxy composites. To complement these properties, Izod impact tests are now communicated in this brief report for similar composites with up to 30 vol% of guaruman fibers. A substantial increase in impact resistance, with over than 20 times the absorbed energy for the 30 vol% guaruman fiber composite, was obtained in comparison to neat epoxy. These results were statistically validated by Weibull analysis, ANOVA, and Tukey’s test. Scanning electron microscopy analysis disclosed the mechanisms responsible for the impact performance of the guaruman fiber composites.

Effect of surface modification of WO3nanostructures on the performance for p-Si/n-WO3structure diodes

2021 ◽  
pp. 108695
Author(s):  
B. Gowtham ◽  
V. Ponnuswamy ◽  
J. Chandrasekaran ◽  
V. Balasubramani ◽  
R. Suresh ◽  
...  
Keyword(s):  
Surface Modification ◽  
Effect Of Surface

scholarly journals Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

2007 ◽  
Vol 26 (6) ◽  
pp. 924-929 ◽  
Author(s):  
Yosuke HORIUCHI ◽  
Mariko HORIUCHI ◽  
Takao HANAWA ◽  
Kunimichi SOMA
Keyword(s):  
Surface Modification ◽  
Ni Alloy ◽  
Effect Of Surface

Effect of surface modification of TiV2.1Ni0.3 by ball-milling with MgNi on charge–discharge cycle performance

2000 ◽  
Vol 302 (1-2) ◽  
pp. 82-86 ◽  
Author(s):  
Weon-Kyung Choi ◽  
Toshiyuki Tanaka ◽  
Tsutomu Morikawa ◽  
Hiroshi Inoue ◽  
Chiaki Iwakura
Keyword(s):  
Surface Modification ◽  
Ball Milling ◽  
Cycle Performance ◽  
Discharge Cycle ◽  
Charge Discharge ◽  
Effect Of Surface
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