Recommanded Product: 2657-87-6In 2016, Meng, Xiangsheng;Zheng, Yan;Yan, Jingling;Li, Yunhui;Wang, Zhen;Li, Guodong published 《2,3,3′,4′-Oxydiphthalic dianhydride-based phenylethynyl-terminated imide oligomers for low-temperature resin transfer molding applications》. 《High Performance Polymers》published the findings. The article contains the following contents:
A series of imide resins were prepared using 2,3,3′,4′-oxydiphthalic dianhydride, 4-phenylethynylphthalic anhydride, and aromatic diamines (1,3-bis(3-aminophenoxy), 3,4′-oxyaniline, 2,2′-bis(trifluoromethyl)benzidine, and m-phenylenediamine) as starting materials. These imide oligomers were characterized by means of Fourier transform IR spectroscopy, differential scanning calorimetry, intrinsic viscosity measurements, and rheol. measurements. Some of these oligomers exhibited low (<1 Pa.s at 250°C) and stable (>2 h at 250°C) melt viscosity, which was highly desirable for resin transfer molding process. Thermosetting polyimides (PIs) were then produced from these oligomers via thermal crosslinking reaction of phenylethynyl group. The properties of the thermosets were studied using tensile and flexural testing, dynamic mech. thermal anal., and thermogravimetric anal. The cured PIs exhibited a good combination of thermal and mech. properties, with a tensile strength of 31-76 MPa, flexural strength of 38-142 MPa, glass transition temperatures of 233-358°C, and 5% weight loss temperatures of 540-545°C under nitrogen atm. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.
3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Recommanded Product: 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.
Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem