Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 22-28.doi: 10.13475/j.fzxb.20220103207

• Manufacture and Application of High Performance Flexible Textile Composites • Previous Articles     Next Articles

Thermal mechanical properties of polyimide fiber-reinforced polydimethylsiloxane flexible film

HUANG Yaoli1, LU Cheng1, JIANG Jinhua1,2, CHEN Nanliang1,2, SHAO Huiqi3()   

  1. 1. Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Textiles, Donghua University, Shanghai 201620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2022-01-14 Revised:2022-03-16 Online:2022-06-15 Published:2022-07-15
  • Contact: SHAO Huiqi E-mail:hqshao@dhu.edu.cn

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Abstract:

Aiming at the thermal deformation and thermodynamic problems of fiber-reinforced flexible film in service, polyimide (PI) fiber-reinforced polydimethylsiloxane (PDMS) flexible composite film was prepared with polyimide fiber as reinforcement and polydimethylsiloxane as matrix by scraper coating. The thermal stability of the composite membrane was studied using a thermogravimetric analyzer. The universal material tester and the thermomechanical analyzer were used to discuss the influence of the linear density and laying density of the oriented reinforced fiber on the mechanical properties and thermal expansion coefficient of the composite film. COMSOL finite element simulation was used to analyze the thermal expansion and deformation mechanism of fiber-oriented reinforced composite membrane. The results show that the rate of mass loss is only 1.22% at 300 ℃, indicating that the thermal stability of composite membrane below 300 ℃. With the increase of fiber layer density and linear density, the breaking strength and elastic modulus gradually increase and the thermal expansion coefficient gradually decreases, and both exhibit negative expansion characteristics, indicating that the orientation enhancement of polyimide fibers can effectively influence the dimensional stability of composite membrane materials. The correlation between the simulation and the experimental results is good, indicating that the model can be used to predict and optimize the thermal expansion coefficient of PI fiber-reinforced composite membranes.

Key words: polyimide fiber, thermal stability, thermal expansion coefficiency, mechanical property, finite element simulation, composite material, polydimethylsiloxane

CLC Number: 

  • TQ343

Tab.1

Parameters of PI fiber and PDMS"

材料 热膨胀系数/
(μm·(m·℃)-1)		 恒压热容/
(J·(kg·K)-1)		 导热系数/
(W·(m·K)-1)		 密度/
(kg·m-3)		 弹性模量/
MPa		 泊松比
PI纤维 -2.00 1 100 0.15 1 440 20 000 0.30
PDMS 187 1 460 0.16 970 0.75 0.49

Fig.1

Thermal stability of PI fiber, PDMS and reinforced films. (a) TG curve; (b) DTG curve"

Fig.2

Stress-strain curve of PI fiber, PDMS film and PI fiber-reinforced films with different layer densities"

Tab.2

Mechanical properties of PDMS film and PI fiber its reinforced films with different layer densities"

铺层密度/
(根·(10 cm)-1)		 断裂强度/
MPa		 弹性模量/
MPa
PDMS膜 2.0±0.05 0.5±0.02
30 13.73±0.26 236±5.21
50 23.07±2.70 365±1.41
70 28.24±1.89 537±6.46
90 41.02±3.14 628±3.20

Fig.3

Stress-strain curve of PI-fiber reinforced films with different linear densities"

Tab.3

Mechanical properties of PI fiber reinforced films with different linear densities"

线密度/tex 断裂强度/MPa 弹性模量/MPa
6 15.92±2.50 293±1.61
11 18.81±1.44 365±1.41
22 21.25±0.37 470±6.37

Tab.4

Thermal expansion coefficient of PI fiber reinforcedμm/(m·℃)"

PI纤维 PDMS 不同铺展密度的纤维增强膜
30 50 70 90
-3.44±0.07 187.71±3.93 -1.66±0.25 -2.18±0.02 -5.24±0.03 -7.54±0.04

Fig.4

Cloud diagram of deformation(a) and temperature (b) at 140 ℃"

Fig.5

Boundary displacement change distribution"

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