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首页> 外文期刊>Journal of Applied Polymer Science >Facile fabrication of polyimide foam sheets with millimeter thickness: Processing, morphology, and properties
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Facile fabrication of polyimide foam sheets with millimeter thickness: Processing, morphology, and properties

机译：轻松制造毫米厚度的聚酰亚胺泡沫板：加工，形态和性能

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摘要

A series of polyimide foam sheets (PIFSs) with thickness of 0.5 mm using 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 3,4′-oxydianiline (3,4′-ODA), and polyaryl polymethylene isocyanate (PAPI) as main materials were first fabricated by liquid foaming and compression molding technology. The effects of different PAPI contents and 3,4′-ODA contents on the structures and properties of PIFSs were investigated. The results indicated that PIFSs exhibited a structure that front surface displayed closed cells made of damaged cell walls and membranes, while internal cells were open, and elliptic vacancies were flatted in the thickness direction from the cross section. The average cellular diameter increased with increasing PAPI loading. In addition, the introduction of 3,4′-ODA increased the average cell size of PIFSs. Further, PIFSs had density of 0.087-0.239 g/cm~3, elongation at break of 3.75-8.01% and tensile toughness of 3.46 × 10~(-2)-13.87 × 10~(-2) J/cm~ 3. Notably, they exhibited higher tensile strength of 1.89-5.42 MPa and lower thermal conductivity of 14.727-19.25 mW/m ?K at 24°C, compared to the polyimide foams reported earlier. The sound absorption coefficients (α) of samples with different PAPI contents increased and then decreased with increasing PAPI content. At low frequencies, a certain content of 3,4′- ODA allowed an improvement of the acoustical behavior of PIFSs, and the α increased and then decreased with increasing density.
机译：使用3,3'，4,4'-二苯甲酮四羧酸二酐（BTDA），3,4'-氧二苯胺（3,4'-ODA）和聚芳基聚亚甲基异氰酸酯制成的一系列厚度为0.5 mm的聚酰亚胺泡沫板（PIFS） （PAPI）作为主要材料首先是通过液体发泡和压缩成型技术制造的。研究了不同PAPI含量和3,4'-ODA含量对PIFS结构和性能的影响。结果表明，PIFS显示出这样的结构，即前表面显示出由受损的细胞壁和膜构成的闭孔，而内部细胞是开放的，并且椭圆形空位在横截面的厚度方向上变平。平均细胞直径随着PAPI负荷的增加而增加。另外，引入3，4'-ODA增加了PIFS的平均细胞大小。此外，PIFS的密度为0.087-0.239 g / cm〜3，断裂伸长率为3.75-8.01％，拉伸韧性为3.46×10〜（-2）-13.87×10〜（-2）J / cm〜3。值得注意的是，与早先报道的聚酰亚胺泡沫相比，它们在24°C下具有1.89-5.42 MPa的较高拉伸强度和14.727-19.25 mW / m？K的较低导热率。 PAPI含量不同的样品的吸声系数（α）随PAPI含量的增加而增加，然后降低。在低频下，一定含量的3,4'- ODA可以改善PIFS的声学性能，并且α随着密度的增加先升高后降低。

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