Synthesis and characterization of 4-phenylethynylphtralic anhydride terminated oligoimides and polyimides

CORC > 化学研究所 > 中国科学院化学研究所

	Synthesis and characterization of 4-phenylethynylphtralic anhydride terminated oligoimides and polyimides
	Chen Jiansheng; Zuo Hongjun; He Guanjun; Fan Lin; Yang Shiyong
刊名	ACTA POLYMERICA SINICA
	2008-04-01
期号	4 页码:337-342
关键词	Polyimide 4-phenylethynylphthalic Anhydride Thermal Property Rheological Property
ISSN号	1000-3304
英文摘要	Thermosetting phenylethynyl terminated polyimides are well known for their super thermo-oxidative stability and excellent toughness, and have been widely used in aerospace area. PETI-5 (PhenylEthynyl Terminated Imide-5) developed by NASA is the-state-of-art of this type polyimides, while it is a semi-crystalline polyimide with melting temperature of 353 degrees C near the crosslinking temperature of phenylethynyl groups, which made it difficult for PETI-5 to fabricate complex shape parts. In the pursuit of novel phenylethynyl terminated polyinrides with high melt processability, researchers have developed several polyimides by introduction of fluorine groups and twisty structures. In this paper,a series of oligoimides (PIO) with calculated molecular weight of 5000 were prepared using flexible dianhydride of 4,4'-oxydiphthalic anhydride (ODPA), and mixtures of two diamines of 1,3-bis(4-aminophenoxy) benzene (1,3,4-APB) and 3,4'-oxydianiline (3,4'-ODA) in the presence of 4-phenylethynylphthalic anhydride (4-PEPA) as endcapping agent in order to enhance the processability. In addition, oligoimides (PIB) using 3,3' 94, 4'-biphenyltetracarboxylic dianhydride (s-BPDA) were also prepared for comparison. Effects of the kind of dianhydride and diamine on their properties and melt processabilities were systematically investigated. Experimental results indicated that PIO was amorphous in nature,and exhibited low melt viscosity and high melt viscosity stability at elevated temperatures, and with the increase of the content of 1, 3, 4-APB the melt viscosity decreased correspondingly. The PIB is semi-crystalline in nature and exhibited high melt viscosity at elevated temperatures, meanwhile, the melt temperature of PI-B was close to the cure temperature of phenylethynyl groups, which reduced the processability. The molecular weight-controlled oligoinrides could be thermally cured at 371 degrees C to yield thermosetting polyimides by polymer chain extension and crosslinking of phenylethynyl groups. All cured resins showed good thermal stability with 5 % weight loss temperature of > 500 degrees C and high glass transition temperatures of > 243 degrees C. In addition, with the increase of the content of 1, 3,4-APB, the glass transition temperatures of PIO cured resin decreased from 281 to 243 degrees C. PIO-2 cured resin also exhibited good mechanical properties with tensile strength of 102 MPa, tensile modulus of 1.8 GPa, high break elongation of 10 % I flexural strength of 142 MPa and flexural modulus of 3. 1 GPa.
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000255411000006
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/64679]
专题	中国科学院化学研究所
通讯作者	Chen Jiansheng
作者单位	Chinese Acad Sci, Adv Mat Lab, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Chen Jiansheng,Zuo Hongjun,He Guanjun,et al. Synthesis and characterization of 4-phenylethynylphtralic anhydride terminated oligoimides and polyimides[J]. ACTA POLYMERICA SINICA,2008(4):337-342.
APA	Chen Jiansheng,Zuo Hongjun,He Guanjun,Fan Lin,&Yang Shiyong.(2008).Synthesis and characterization of 4-phenylethynylphtralic anhydride terminated oligoimides and polyimides.ACTA POLYMERICA SINICA(4),337-342.
MLA	Chen Jiansheng,et al."Synthesis and characterization of 4-phenylethynylphtralic anhydride terminated oligoimides and polyimides".ACTA POLYMERICA SINICA .4(2008):337-342.