English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52572/87736 (60%)
Visitors : 9378523      Online Users : 522
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/109933

    Title: The Influence of Polymer Viscoelasticity on the Optical Features during an Optical Lens Development
    Authors: Lin, Gwo-Geng;Lai, Der-Lung;Huang, Chao-Tsai (C.T.);Jye Wang, and Yuan-Jung Chang, and Rong-Yeu Chang
    Keywords: viscoelasticity;optical birefringence;Cross model;White-Metzner model
    Date: 2016/07/28
    Issue Date: 2017-03-14 02:10:45 (UTC+8)
    Abstract: In modern life, polymeric optical lens has been utilized in many electronic devices, such as camera, mobile phone, tablet, and so on. Although hundred million lenses are produced annually for those devices, the quality is the key to the main suppliers. Indeed, the optical quality is affected by both the geometric features and the optical birefringence. However, how the material’s viscoelasticity influences the optical features is still not fully understood yet. In this study, we have systematically investigated the viscoelastic effects on the optical property of a lens made of Zeonex COP 480R material by the traditional injection molding, simulated with n = 0.4 and * = 217,000 Pa in the Cross model. We assumed that the rheological parameters can be modified artificially based on the White-Metzner model of viscoelasticity, in which the viscosity was of the Cross-type model. Results show that if the power-law index (n) was changed from 0.1 to 0.6, the total fringed order has no significant difference, but the fringed patterns was varying dominantly in the perpendicular direction, instead of the flow direction. This situation was matched with the distribution of the flow-induced residual stresses. Moreover, if the * in the Cross model was varied from 100,000 Pa to 300,000 Pa, the total fringed patterns were apparently changing from being dominated in the flow direction to being in the direction perpendicular to the flow. The influenced width of the fringed patterns was almost linearly increased with the increasing *. Moreover, to discover viscoelastic effect on the optical property using modified White-Metzner model, when material has larger relaxation time, it will cause stronger birefringence effect in both the flow and the perpendicular directions. The results can be applied as some guideline for either the further material modifications or the new material developments.
    Relation: PPS-32 Proceeding
    Appears in Collections:[化學工程與材料工程學系暨研究所] 會議論文

    Files in This Item:

    File Description SizeFormat
    The Influence of Polymer Viscoelasticity on the Optical Features during an Optical Lens Development_議程.pdf729KbAdobe PDF47View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback