Title: STRUCTURE AND MECHANICAL PROPERTIES OF INJECTION MOULDED CF/LCP THIN PLATES
Page Range: p.207-220
Author(s): Baba F; Fujita A; Hon C; Nakai A; Hamada H
File size: 459K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 3
Abstract
This paper reports on a study of the effect of the injection speed on the structure and bending properties of liquid crystal polymer (LCP) injection moulded plates. The distribution of the modulus in injection moulded LCP and CF/LCP thin plates, made using two different injection speeds, was investigated by taking slices at 0.1 mm intervals. In addition, the modulus of the CF/LCP thin plate was estimated by the Cox formula and by laminate theory from values of the fibre orientation and modulus of each LCP layer. It was found that the differences in the bending properties and structures due to changes in injection speed were not remarkable. Differences in fracture behaviours with changes in the cutting position were caused by the differences in the modulus of each layer as in the laminated composite. It was confirmed that injection moulded CF/LCP could be treated in general as a laminated composite, and that the distribution of the modulus in injection moulded CF/LCP could be evaluated by the slicing technique. It was shown that by evaluating the fibre orientation and modulus of the sliced specimens, that fibre orientation contributed to the difference in the modulus near the surface when the injection speed changed. It was also verified that the prediction method suggested by the authors is valid to estimate the modulus of thin injection moulded CF/LCP plates. 12 refs.
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