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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of Aromatic Poly(amide-imide) Copolymers Containing para-meta Benzoic Structure
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Synthesis of Aromatic Poly(amide-imide) Copolymers Containing para-meta Benzoic Structure

机译：含准间位苯甲酸结构的芳族聚酰胺酰胺共聚物的合成

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Thermostable poly(amide-imide)s containing para-meta benzoic structure were synthesized by reacting a para-meta benzoic polyamide prepolymer with various diisocyanate-terminated polyimide prepolymers. The polymaide prepolymers ere prepared by first reacting m-phenylene diamine and siophthaloyl dichloride to form a poly(m-phenylphthalamide) prepolymr, then the terephthaloyl dichloride was subse-quently added to form a para-meta benzoic polyamide prepolymer. The polyimide prepolymers were also prepared by using 4,4'-diphenylmethane disocyanate to react with pyromellitic diamhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride, or 3,3',4,4'-sulfonyldiphthalic anhydride using the direct one-pot method to improve their solubilityl but without sacrificing thermal and physical properties. From the experimental results, the inherent viscosity of the copolymers was 0.72-1.15 dL/g and they were readily soluble in a wide rnage of organic hot solvents such as N-methyl-2-pyrrolidone, dimethylimidazole, N,N-dimethylacetamide, dimethyl sulfoxide, and N,N-dimethylformamide; however, some of the copolymers were not soluble in pyridine. The solubility was related to their chemical structure. Those copolymers with sulfonyl and high amide content displayed good solubility. All the poly(amide-imide)s had a glass transition temperature of 260-324deg C, but the melting point did not vary much. The 10% weight loss temperatures were in a range of 463-580deg C in nitrogen and 450-555deg C in an air atmosphere. The tensile strength, elongation at break, and initial modulus of the copolymer films franged from 59 to 102 MPa, 3.1 to 5.1%, and 1.52 to 3.59 GPa, respectively. These copolymer, except those of high imide content (e.g., P-6,B-4,B-6 and D-6), which showed an amorphous structure, mostly display a crystalline morphology.
机译：通过使对位苯甲酰胺聚酰胺预聚物与各种二异氰酸酯封端的聚酰亚胺预聚物反应，合成了含有对位苯甲酸结构的热稳定聚（酰胺酰亚胺）。聚酰亚胺预聚物的制备是通过首先使间苯二胺与二邻苯二甲酰邻苯二甲酰氯反应形成聚（间苯二甲酰邻苯二酰胺）预聚物，然后随后加入对苯二甲酰二氯形成对-间-苯甲酰胺聚酰胺预聚物。聚酰亚胺预聚物也通过使用4,4'-二苯基甲烷二异氰酸酯与均苯四甲酸二酐，3,3'，4,4'-二苯甲酮四羧酸二酐或3,3'，4,4'-磺酰基二邻苯二甲酸酐反应制得。一锅法，以提高其溶解度，但又不影响热和物理性能。根据实验结果，该共聚物的比浓对数粘度为0.72-1.15 dL / g，它们易于溶于多种有机热溶剂中，例如N-甲基-2-吡咯烷酮，二甲基咪唑，N，N-二甲基乙酰胺，二甲基亚砜和N，N-二甲基甲酰胺;然而，一些共聚物不溶于吡啶。溶解度与其化学结构有关。具有磺酰基和高酰胺含量的那些共聚物显示出良好的溶解性。所有的聚（酰胺-酰亚胺）的玻璃化转变温度为260-324℃，但是熔点变化不大。失重的10％温度在氮气中为463-580℃，在大气中为450-555℃。共聚物膜的抗张强度，断裂伸长率和初始模量分别在59至102 MPa，3.1至5.1％和1.52至3.59 GPa之间变化。这些共聚物，除了具有高酰亚胺含量的那些共聚物（例如P-6，B-4，B-6和D-6）外，它们显示出无定形结构，大部分显示出结晶形态。

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