A kind of method that prepares silicon carbide fiber by high softening point polycarbosilane
A technology of silicon carbide fiber and polycarbosilane is applied in the field of preparing silicon carbide fiber, which can solve the problems of loss, poor spinnability, and increase in melt viscosity of polycarbosilane, so as to avoid instability and ensure stability. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
reference example 1
[0042] Reference Example 1: Synthesis of LPCS-1:
[0043] Put PDMS in a normal-pressure high-temperature synthesis device, vacuumize and replace nitrogen, heat to 420°C under nitrogen protection, and keep it for 2 hours. After pyrolysis, heat it to 450°C at a rate of 10°C / h and keep it for 6 hours. Cool to room temperature to obtain a crude product, dissolve it in xylene and filter to remove insoluble matter, place the filtrate in a distillation apparatus to distill off xylene, then heat to 350°C for vacuum distillation for 1 hour, cool to room temperature to obtain brown Yellow resinous LPCS-1, the measured softening point is 198-216°C, the number-average molecular weight is 1570, the molecular weight distribution coefficient / = 2.4.
reference example 2
[0044] Reference Example 2: Synthesis of LPCS-2:
[0045] Put PDMS in a normal-pressure high-temperature synthesis device. The preparation method is the same as that of LPCS-1. The only difference is that the heating temperature after pyrolysis is changed from 450°C to 440°C, and the holding time is changed to 8h to obtain a brown-yellow resin. LPCS-2, the measured softening point is 189-208°C, the number-average molecular weight is 1480, and the molecular weight distribution coefficient / = 2.3.
reference example 3
[0046] Reference Example 3: Synthesis of SPCS:
[0047] Put PDMS in a normal-pressure high-temperature synthesis device, vacuumize and replace nitrogen, heat to 420°C under nitrogen protection, and keep it for 2 hours. After pyrolysis, heat it to 460°C at a rate of 10°C / h and keep it for 2 hours. Cool to room temperature to obtain a crude product, dissolve it in xylene and filter to remove insoluble matter, place the filtrate in a distillation apparatus to distill off xylene, then heat to 350°C for 2 h under reduced pressure, and cool to room temperature to obtain Brown-yellow resinous SPCS, the measured softening point is 205-220°C, the number-average molecular weight is 1620, and the molecular weight distribution coefficient / = 2.6.
PUM
Property | Measurement | Unit |
---|---|---|
softening point | aaaaa | aaaaa |
diameter | aaaaa | aaaaa |
softening point | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com