The molar amount of dianhydride ODPA
was kept constant, but the amounts of two diamines BAFL and 3,4'-ODA were varied, keeping the total molar number of two diamines equal to that of the dianhydride.
First, a poly(amic acid) 1 was obtained by the reaction of DAB with ODPA
, using NMP as solvent.
Samples Dianhydride Diamine mixture PI-1 BPDA 1,3,4-APB(75), 3,4'-ODA(25) PI-2 6FDA 1,3,4-APB(75), 3,4'-ODA(25) PI-3 ODPA
1,3,4-APB(75), 3,4'-ODA(25) PI-4 9FDA 1,3,4-APB(75), 3,4'-ODA(25) PI-5 BPDA 1,3,4-APB(50), 3,4'-ODA(50) PI-6 BPDA 1,3,4-APB PI-7 BPDA 1,3,4-APB(75), 3,4'-ODA(25) Samples Calculated [M.
This shift may be due in part to the electron affinities of the ODPA
and 6F units, which influence the [pi]-[[pi].
60 Pendulum rebound (Z), % at 23 [degrees] C 61 69 70 at 100 [degrees] C 69 76 78 Formula (3247): NR - 100; silica 150BET - 30; oil - 3; ODPA
- 1; DCP - 2.
, that is, 4,4'-oxydiphthalic anhydride (Chriskev), was recrystallized from acetic anhydride before use.
With these issuances, the aggregate outstanding dollar principal amount (ODPA
) of the class A-2 notes will increase to $3 billion, and the aggregate ODPA
of the class A-3 notes will increase to $1 billion.
5 Magnesium oxide 4 ODPA
antidegradant 2 Ingredient A 20-60 Ingredient B 5-25 Ingredient C 5-25 Zinc oxide 5 Processing aid 2
g] increases, based on the dianhydride structures in this study, are in the following order: PMDA [greater than] BPDA [greater than] 6FDA [greater than] BTDA [greater than] ODPA
4 82 114 (1) NBS abrasion index Formula: polymer - 100; Hi-Sil 210-50; oil - 5; ODPA
- 1; sulfur - 2; MBTS - 1.
Therefore, PAN and ODPA
were chosen as the candidate antidegradants for further evaluation.
A series of molecular weights of a novel semicrystalline polyimide based on TPEQ and ODPA