| Summary: | 碩士 === 國立成功大學 === 化學工程研究所 === 83 === Composite materials often fail by delamination. In this study,
two thermoplastic polymers, poly(ether imide) (PEI) and poly(
hydroxy ether of bisphenol A) (PHENOXY) were used as
particulate interlaminar toughening agents in graphite/epoxy
system. Mode-I and Mode-II delamination toughness was
characterized using the Mode-I double-cantilever beam (DCB) and
the Mode-II end-notched flexure (ENF) test specimens. The
delamination surface was examined by a scanning electron
microscope (SEM) to investigate the morphology and fracture
mechanism. The results revealed that as the PEI contents were
increased, GIC and GIIC increased. GIC was improved from 167 to
527J/m2 at 1mm/min crosshead rate and GIC was improved from 146
to 493J/m2 at a higher crosshead rate of 10mm/min. GIIC
improved from 293 to 1297J/m2. In PHENOXY interlaminar
toughened system, GIC was almost the same as PEI toughened
system, but GIIC was much lower. The fracture surfaces of PEI
toughened system showed phase-inversed morphology, and the
toughening mechanism was ductile yielding of PEI.
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