Preparation process of alkoxy side chain polyimide/nanometer silica hybrid
A technology of nano-silica and polyimide, which is applied in the field of preparation of alkoxy side-chain polyimide/nano-silica hybrid materials, can solve the problems of thermal stability decline and achieve thermal stability Reinforcement, reduction of thermal expansion coefficient, small particle size effect
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Embodiment 1
[0028] with C 4 -PMDA / SiO2 2 As an example, take polyamic acid solution and a certain amount of silica sol and mix them evenly, spin-lay and imidize to make nano-SiO 2 material (thickness about 0.5mm). prepared under the same conditions without nano-SiO 2 materials compared when SiO 2 When the content is 2% (mass ratio): the maximum light transmittance decreases from 89% to 87%, the tensile strength at room temperature increases to 131.5%, the elongation at break increases from 20% to 33%, and the thermal decomposition temperature increases from 377°C increased to 395°C; when SiO 2 When the content is 4% (mass ratio): the maximum light transmittance decreases from 89% to 84%, the tensile strength at room temperature increases to 140%, the elongation at break increases from 20% to 39%, and the thermal decomposition temperature increases from 377°C increased to 425°C.
Embodiment 2
[0030] with C 12 -PMDA as an example, take polyamic acid solution and a certain amount of silica sol and mix evenly, spin laying, imidization to make nano-SiO 2 material (thickness about 0.5mm). prepared under the same conditions without nano-SiO 2 materials compared when SiO 2When the content is 2% (mass ratio): the maximum light transmittance decreases from 82% to 79%, the tensile strength at room temperature increases to 138.6%, the elongation at break increases from 26% to 41%, and the thermal decomposition temperature increases from 355.6°C increased to 385°C; when SiO 2 When the content is 4% (mass ratio): the maximum light transmittance decreases from 82% to 76%, the tensile strength at room temperature increases to 143%, the elongation at break increases from 26% to 43%, and the thermal decomposition temperature increases from 355.6°C increased to 402°C.
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