113485-64-6Relevant articles and documents
Synthesis and characterization of poly(hydroxyamide-benzoxazole) multi-block copolymers
Kwon, Young Koo,Kim, Young Jun
, p. 172 - 183 (2008)
Poly(hydroxyamide-benzoxazole) multi-block copolymers were prepared from the polymerization of 2,2'-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (6FAP) and 4,4'-oxydibenzoyl chloride (ODBC). N,O-bis(trimethylsilyl) trifluoroacetamide (BSTFA) or N,O-bis(trimethylsilyl)acetamide (BSA) was used as a silylation agent to activate amine functional groups. The amine terminated hydroxyamide prepolymers (ATHA) were synthesized by employing the low temperature solution polymerization via the in situ silylation method. p-Toluenesulfonic acid was added into the reaction mixture of ATHA, which in turn followed by cyclodehydration at 150 ～ 190°C 4 for 24 hrs to produce amine terminated benzoxazole oligomers (ATBO). Finally, the poly(hydroxyamide-benzoxazole) multi-block copolymers were prepared from the condensation of ATHA, ATBO and ODBC by employing the silylation method at relatively low temperature of 60°C. In the present work, properties of multi-block copolymers have been investigated.
Synthesis of acid-soluble graphene and its use in producing a reduced graphene oxide-poly(benzobisoxazole) composite
Liu, Xiaoyun,Zhuang, Qixin,Liu, Xilong,Wang, Qing,Zhou, Jingning,Han, Zhewen
, p. 12381 - 12388 (2012)
A new chemically modified graphene was prepared using carboxylated graphene oxide (GO) and fluorinated poly(hydroxyamide) (6FPHA), the latter is the precursor of fluorinated poly(benzobisoxazole) (6FPBO). The results showed that, unlike common GO, which can only be dispersed in water under neutral or basic conditions, the RGO-6FPBO (reduced graphene oxide-6FPBO) could be stably dispersed in Lewis acids. The RGO-6FPBO-poly(benzobisoxazole) (PBO) composite was achieved by simple solution blending of RGO-6FPBO and PBO in methanesulfonic acid. The obtained RGO-6FPBO-PBO composite films exhibited a dramatic increase in electrical conductivity, by 8 orders of magnitude at the RGO-6FPBO content of 4 wt%, without significantly sacrificing optical transparency. When the content of RGO-6FPBO was higher than 4 wt%, the dielectric constant of the composite film also increased remarkably. The mechanical properties and thermal stability of the composite were also improved by the incorporation of RGO-6FPBO.
Synthesis of multiwalled carbon nanotube/fluorine-containing poly(p-phenylene benzoxazole) composites exhibiting greatly enhanced dielectric constants
Zhuang, Qixin,Mao, Xiaoyang,Xie, Zhong,Liu, Xiaoyun,Wang, Qing,Chen, Yi,Han, Zhewen
, p. 4732 - 4739 (2012)
A series of high-performance polymer/carbon nanotube (CNT) composites with different nanotube contents have been prepared via condensation of N-silylated diamino terminated precursor of the polymer with acid chloride-functionalized CNTs and subsequent thermal cyclodehydration. The composites have been fully characterized by infrared and Raman spectroscopy, electron microscopy, and thermal analysis. Various interesting morphologic features including helical structures have been observed in the composites as a result of covalent attachment of the polymer. The composites exhibit excellent thermal stability and a significant improvement in the dielectric constant and mechanical strength with the inclusion of CNTs. Copyright
