35174-91-5Relevant academic research and scientific papers
Synthesis and gas transport properties of new high glass transition temperature ring-opened polynorbornenes
Pineda Contreras, Armando,Tlenkopatchev, Mikhail A.,Del Mar Lopez-Gonzalez, Maria,Riande, Evaristo
, p. 4677 - 4684 (2002)
The synthesis and polymerization of the new monomers N-(1-adamantyl)-exo-norbornene-5,6-dicarboximide (AdNDI), N-cyclohexyl-exo-norbornene-5,6-dicarboximide (ChNDI), and N-phenyl-exo-norbornene-5,6-dicarboximide (PnNDI) are reported. Copolymers of N-(1-adamantyl)-exo-norbornene-5,6-dicarboximide/norbornene, with molar compositions 50/50, 70/30, and 30/70, were also obtained. The transport of hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethylene, and ethane across membranes prepared from these homopolymers and copolymers was determined at 30°C using permeation techniques. Diffusion coefficients correlate rather well with the diameter of diffusant molecules except in the case of carbon dioxide. The values of the permselectivity coefficient for different gases depend on the type of membranes. For example, the permselectivity of oxygen with respect to nitrogen, α(O2/N2), is ca. 5.50 for membranes prepared from N-(1-adamantyl)-exo-norbornene-5,6-dicarboximide/norbornene (50/50) copolymers, which compares favorably with the values reported for this parameter in membranes with imide groups located in the backbone. The values of α(H2/C2H6) in membranes of poly(N-(1-adamantyl-exo-norbornene-5,6-dicarboximide), poly(N-cyclohexyl-exo-norbornene-5,6-dicarboximide), and poly(N-phenyl-exo-norbornene-5,6-dicarboximide) are 183, 124, and 122, respectively, whereas the values of α(C2H4/C2H6) amount to 6.9, 7.6, and 6.4, respectively. For most membranes used in this study, diffusion rather than solubility is responsible for the discrimination of gas transport. However, solubility is mainly responsible for the high permselectivity of ethylene with respect to ethane displayed by the membranes.
Electro-optic properties of a side chain poly(norbornene-dicarboximide) system with an appended phenyl vinylene thiophene chromophore
Spring, Andrew M.,Qiu, Feng,Hong, Jianxun,Bannaron, Alisa,Yokoyama, Shiyoshi
, p. 13 - 27 (2017/05/15)
A side chain EO copolymer series has been synthesized by ROMP using the Grubbs 3rd generation initiator and quenched with ethyl vinyl ether. The copolymers were prepared by combining two norbornene-dicarboximide monomers, one with a cyclohexyl substituent and another substituted with an FTC chromophore. The mol% of the chromophore-substituted monomer was varied from 0.00?mol% to 22.92?mol%, all polymers were obtained in a yield of between 83 and 92% and a purity of between 97 and 98%. The cis:trans vinylene ratio remained constant at 1:1, confirming the polymers were amorphous. Peak molecular weights increased from 29,541?g/mol to 142,113?g/mol and the PDI increased from 1.36 to 4.01 respectively. Glass transition and thermal decomposition temperatures decreased from 206?°C to 168?°C and 433?°C to 382?°C as the mol% of the chromophore-substituted monomer was increased. UV–vis absorbance spectroscopy was used to quantify the chromophore content. A close correlation (68–95%) between the measured and calculated absorbance was found. The polymer containing 22.92?mol% of the chromophore-substituted monomer had a maximum r33 of 70?pm/V when polled at an optimum field of 60?V/μm at a polling temperature of 200?°C. This equates to a high polling efficiency of 1.16. High current flow in this polymer film at elevated field strength caused a breakdown of the electrode, preventing access to an elevated electro-optic coefficient. This polymer was found to have an excellent stability of 76% when aged at 85?°C for 1000?h in air.
Synthesis and structure-property comparisons of hydrogenated poly(oxanorbornene-imide)s and poly(norbornene-imide)s prepared by ring-opening metathesis polymerization
Yoon, Kyung-Hwan,Kim, Kyung Oh,Wang, Chengqing,Park, Insook,Yoon, Do Y.
experimental part, p. 3914 - 3921 (2012/10/08)
Various structures of poly(norbornene-imide)s and poly(oxanorbornene-imide) s were synthesized and an optimal hydrogenation method was established. The thermal, thermomechanical, mechanical, and optical properties of thus prepared polymers were investigated, together with the structural characteristics shown by wide-angle X-ray scattering patterns. Poly(oxanorbornene-imide)s exhibit local nanostructure caused by intermolecular interactions between the imide and backbone oxygen moiety, which appears to prevent a significant decrease in Tg when compared with poly(norbornene-imide)s. Overall, hydrogenated poly(oxanorbornene-imide)s, obtained with more readily prepared exo-monomer, exhibit similar physical properties when compared with the corresponding hydrogenated poly(norbornene-imide)s. Copyright
