| abstract |
Combination (B) comprising: - at least one aromatic polyimide (P1), and - at least one polyarylene (P2), more than 50% by weight of the repeating units thereof are optionally substituted arylene groups [repeating units ( R2)], each of said repeating units (R2) being connected by each of its two ends to two other arylene groups optionally substituted by a direct CC link, and said repeating units (R2) being a mixture (M) consisting of: - between 0 and 75 mol%, based on the total number of moles of repeating units (R2), of rigid rod forming arylene units (R2a), optionally substituted with at least one group monovalent substituent, with - between 25 and 100 mol%, based on the total number of moles of repeating units (R2), of arylene creasing units (R2b), optionally substituted with at least one substituent group monovalent |