Synthesis and characterization of novel polyimides containing fluorine and phosphine oxide moieties

Synthesis and property measurements of polyimides with substituted pyromellitic dianhydride for flexible printed circuits applications

“…As shown in Table III, the PPMDA-mDAPPO and 3FPPMDA-mDAPPO polymides exhibited high peel strength of 130 and 121 g/mm, respectively, demonstrating the positive effect of adhesion promoting phosphine oxide moiety in mDAPPO, as well as the negative effect of fluorine moiety in 3FPPMDA. 17 It was also noted that the peel strength of PPMDAmDAPPO polyimide decreased to 117 and 111 g/mm at 30 and 40% pPDA incorporation, respectively, while that of 3FPPMDA-mDAPPO polyimide decreased to 109 and 104 g/mm at 50 and 60% pPDA, respectively. Decreased peel strength with pPDA incorporation can be attributed to the increased chain rigidity of polyimides.…”

“…Good solubility, despite their rigid backbone structure, can be attributed to the phosphine oxide moiety and the non-coplanar characteristics of mDAPPO. 17 In comparison, 3FPPMDA-mDAPPO polyimide was soluble in NMP, DMAc, and CHCl 3 , while 3FPPMDA-mDAPPO/pPDA exhibited slightly poorer solubility, being soluble only in NMP and DMAc. Because all polyimides were soluble in NMP, intrinsic viscosities were measured in NMP with Cannon-Ubbelohde viscometer at 25 C, which resulted in values in the range of 0.22-0.26 dL/g (Table II), demonstrating well-controlled molecular weight, given the target molecular weight of 25,000 g/mol.…”

“…12 However, this problem has been solved by solution imidization carried out in the temperature range of [180][181][182][183][184][185][186][187][188][189][190] C in the presence of azeotroping agent, 13 resulting in soluble thermoplastic polyimides. In addition, structural modification of polyimides by incorporating imidazole, 14 pyridine, 15 or phosphine oxide groups 16,17 has also been attempted to enhance the adhesive property.and diamine monomers with adhesion promoting functional groups via solution imidization, but they provided slightly inferior properties for FPC applications. 18,19 In this study, therefore, it was attempted to prepare polyimides from pyromellitic dianhydride (PMDA)-based dianhydrides, a diamine with phosphine oxide moiety and 4,4 0 -phenylene diamine (pPDA).…”

Science and technology of perfluorocyclobutyl aryl ether polymers

“…138 PPO containing polymers are observed to be amorphous in nature providing low birefringence 139 and high refractive index. 135 Of particular note, Connell and coworkers 140 at NASA Langley have developed a series of PPO containing polymers that have shown excellent AO resistance in short-term space flight studies and ground-based spaces simulations.…”

Synthesis and characterization of polyimides from 4‐(diphenyl phosphine oxide)phenyl pyrromellitic dianhydride

“…This can be achieved by the surface modification of Cu foil by tie-layer coating of Cr, Ti, or polymers, [25][26] or structural modification of polyimides with adhesion promoting groups such as pyridine 27 or phosphine oxide groups. [28][29][30] However, no attempt had been made to adopt all three approaches in preparing polyimides with good solubility, low CTE, and excellent adhesion, until they were prepared from diamine containing adhesion promoting phosphine oxide groups and rigidrod type dinahydrides via solution imidization. [31][32] Unfortunately, the results obtained proved to be slightly inferior for FPC application.…”