Patents by Inventor Gongping Shang

Gongping Shang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Methods of preparing polyimide fibers with kidney-shaped cross-sections
    Patent number: 8911649
    Abstract: The present disclosure provides polyimide fibers with kidney-shaped cross-section and their preparation methods thereof, falling within the technical field of polyimide fiber. Polyimide fibers with kidney-shaped cross-sections are prepared by a continuous, integrated approach, starting from a polyamic acid solution prepared by reacting an aromatic dianhydride with an aromatic diamine. PAA nascent fibers with kidney-shaped cross-sections are obtained by adopting a spinneret having circular orifices under wet spinning process. The kidney-shaped cross-sections are obtained by varying the processing condition, including spinning speed, coagulation bath composition, coagulation temperature, and depth of coagulation bath. After washing and drying, polyamic acid nascent fibers are converted to polyimide fibers with kidney-shaped cross-sections under thermal curing. The integrated preparation methods are suitable for mass industrial production.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 16, 2014
    Assignee: Beijing University of Technology
    Inventors: Dezhen Wu, Enlin Han, Lun Li, Hongqing Niu, Gongping Shang, Shengli Qi, Xiaodong Wang
  • Methods of Preparing Polyimide Fibers with Kidney-Shaped Cross-Sections
    Publication number: 20130183525
    Abstract: The present disclosure provides polyimide fibers with kidney-shaped cross-section and their preparation methods thereof, falling within the technical field of polyimide fiber. Polyimide fibers with kidney-shaped cross-sections are prepared by a continuous, integrated approach, starting from a polyamic acid solution prepared by reacting an aromatic dianhydride with an aromatic diamine. PAA nascent fibers with kidney-shaped cross-sections are obtained by adopting a spinneret having circular orifices under wet spinning process. The kidney-shaped cross-sections are obtained by varying the processing condition, including spinning speed, coagulation bath composition, coagulation temperature, and depth of coagulation bath. After washing and drying, polyamic acid nascent fibers are converted to polyimide fibers with kidney-shaped cross-sections under thermal curing. The integrated preparation methods are suitable for mass industrial production.
    Type: Application
    Filed: March 23, 2012
    Publication date: July 18, 2013
    Applicant: BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY
    Inventors: Dezhen Wu, Enlin Han, Lun Li, Hongqing Niu, Gongping Shang, Shengli Qi, Xiaodong Wang