[논문]Thermally Stable and Processible Norbornene Copolymers

Yoo Dong-Woo; Yang Seung-Jae; Lee Jin-Kyu; Park Joohyeon; Char Kookheon

doi:10.1007/bf03219076

[국내논문] Thermally Stable and Processible Norbornene Copolymers 원문보기

Macromolecular research, v.14 no.1, 2006년, pp.107 - 113

Yoo Dong-Woo (School of Chemistry, Seoul National University) , Yang Seung-Jae (School of Chemistry, Seoul National University) , Lee Jin-Kyu (School of Chemistry, Seoul National University) , Park Joohyeon (School of Chemical and Biological Engineering, Seoul National University) , Char Kookheon (School of Chemical and Biological Engineering, Seoul National University)

Abstract ▼ AI-Helper

Processible norbornene copolymers were realized by judiciously designing norbomene comonomers, which were themselves prepared by the Diels-Alder reaction of cyclopentadiene and benzoquinone followed by the isomerization and alkylation of alcohols. The norbornene copolymers containing these derivatized comonomers, prepared by [Pd($x_{2}CH-{3} $)$_{4}$][$SbF_{6}$]$_{2}$ catalyst, exhibited excellent solubility in many organic solvents as well as good thermal stability, as evidenced by their high glass transition ($T_{g}$) and decomposition ($\∼$350$^{circ}C$) temperatures. In addition, fairly strong adhesion to substrates such as glasses and silicon wafers was also achieved with these copolymers to overcome the limitations experienced by polynorbornene homopolymers and to make them attractive for many important industrial applications.

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제안 방법

Instruments. and 13C-NMR data were measured by Bruker DPX-300 MHz Molecular weights were determined by FAB-Mass Jeol JMS-AX505WA and elemental analysis was performed by EA1110 (CE instrument). The Molecular weights for the polymers were measured by GPC from Yon- glin instrument (eluent : toluene, rate: 1 mL/min, based on PS standard).
If the copolymer film is not peeled off the substrate during the test, the copolymer film is classified as a film with good adhesion. From this tape test (reliability was confirmed with repeated experiments more than 3 times with freshly prepared), we are able to compare the relative adhesion property among PNB, NB9EDMN₁-1000, NB90DMN₁-1000 and NB9BDMN₁ -1000, as summarized in Table Ⅲ.

성능/효과

The results from the Fineman-Ross plot show the reactivity ratio, which is defined as the ratio of cross polymerization over homopolymerization, of EDMN comonomer is higher than the value for norbomene, implying that the polar sites in the EDMN comonomer could enhance the coordination tendency toward Pd catalysts. The extra coordination of the polar sites in the comonomer along with the coordination of olefinic moieties can stabilize the intermediate complexes and thus reduce the activity of catalysts to enable the copolymerization to proceed much slower than the homopolymerization of nombomene itself.
shown in Figure 2(a), the NB9EDMN₁ copolymers with different average molecular weights show fairly good thermal stability and start to decompose at around 350 ℃, which is about 10 ℃ lower than the parent PNB homopolymer (M.W.= 110K). The residue amount for 仕le NB9EDMN₁ copolymers above 500 ℃, which is within 12 to 18 wt%, is slightly higher than the value for the PNB homopolymer (about 6 wt%) presumably due to the incorporation of thermally stable aromatic moieties.

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