Fluorinated and oxyfluorinated short Kevlar fiber‐reinforced ethylene propylene polymer

Abstract

The thermomechanical behavior of fluorinated and oxyfluorinated Kevlar fiber-reinforced ethylene propylene (EP) composites has been studied. The composites have been prepared using brabender mixer and are cured using compression molding technique. FTIR study has been performed to understand the chemical reaction occurred due to modification of composites. Thermal behavior and crystallinity have been studied by DSC, TGA, DMTA, and XRD. These studies show that thermal stability, storage modulus, as well as crystallinity of the treated Kevlar fiber-reinforced EP increases in comparison to the untreated derivative because the surfacemodified Kevlar fiber results in good adhesion between the fiber surface and EP matrix. Tensile strength increases in case of treated Kevlar fiber-reinforced EP in comparison to the untreated one. SEM study supports all the above results. AFM results show that surface roughness increases because of the surface modification resulting from the incorporation of functional group-induced Kevlar fiber. POLYM. COMPOS., 27: 205-212, 2006.

Pineapple leaf fiber reinforced thermoplastic composites: Effects of fiber length and fiber content on their characteristics

“…On the other hand, the crystallite sizes of the composites tended to increase when the PALF contents were increased; suggesting nucleation and growth were favored in the case of PALF in the LDPE matrix. 20 Concerning the PP matrix (Table II), the crystallinity of the PALF/PP composites was relatively unchanged with the PALF inclusion in the matrix. Also, the crystallite size of all the composites did not have a significant difference in all the peak angles.…”

“…Adding PALF for polymer reinforcement resulted in a decreasing of %crystallinity in the composites (Table II) as compared with the pure polymer mentioned in a previous study. 20 LDPE polymer molecular chains were difficult to migrate and diffuse to the surface of the growing polymer crystal with having the PALF dispersion in the composites. In the case of the fiber length effect, the percent crystallinity of the LDPE composites with short fibers decreased marginally.…”

“…This may also be attributed to the strong interfacial interaction between the thermoplastic matrix and long fiber, confining polymer chain orientation. 20 In the case of the PP matrixes, fiber addition at different lengths provided no significant difference in melting enthalpy. Similarly, the melting temperatures of pure PP and their composites were not significantly different.…”

Modification of surface properties of carbon-based and polymeric materials through fluorination routes: From fundamental research to industrial applications

“…The influence of fluorination of one of the components of polymer-fiber composite can be demonstrated by the following example [104]. Short-fiber reinforced polymeric composites gain importance due to the advantages in outstanding mechanical properties, processing, and low cost.…”

“…Thermal and mechanical properties of composites fabricated from Kevlar 1 fiber, modified by direct fluorination and oxyfluorination, and ethylene-propylene (EP) co-polymer were studied in ref. [104] (see Table 3). Kevlar 1 fibers were fluorinated and oxy-fluorinated by 5% F 2 + 95% He mixture (for fluorination) and 5% F 2 + 1% O 2 + 90% He + 4% N 2 (for oxyfluorination), respectively, under 0.8 bar pressure for 30 min at 17 8C.…”