A series
of modified poly(phenylene oxides) (PPOs) with low dielectric
constant, high T
g and good dimensional
stability were developed. These polymers were synthesized by treating
brominated PPOs with a biobased anethole and polymerized at a high
temperature in the presence of a peroxide. When the molar ratios of
anethole in the PPO were 0.2, 0.35 and 0.5, respectively, the cross-linked
PPOs displayed low dielectric constants of less than 2.74 and high T
g (more than 220 °C). In particular, the
PPO with 0.5 molar ratio of anethole exhibited a coefficient of thermal
expansion (CTE, 23.4 ppm/°C) that is comparable to copper foil
(ca. 18 ppm/°C). This result indicated that the modified PPOs
are suitable for the production of copper-cladded laminates in electronic
industry. Moreover, compared to a commercial PPO having a T
g of 153 °C and CTE of 155.8 ppm/°C,
the modified PPOs with anethole units possessed a higher thermostability.
Considering that PPOs are widely used in the electronics industry,
this contribution offers a new approach to prepare high-performance
materials using a biobased feedstock.
Perfluorocyclobutyl (PFCB)-based polymers exhibit attractive properties, including good thermal and chemical stability, high hydrophobicity and transparency, as well as good insulating properties.
A new spiro-centered thermopolymerizable fluorinated macromonomer is reported here. This fourfunctional macromonomer is synthesized by a convergent strategy, and shows a low melting point (93 C) and good solubility in the common organic solvents. When heated to a high temperature, the macromonomer converts into a cross-linked network (PD 1 ), which exhibits a T g of near 316 C and a 5% weigh loss at a temperature of 417 C in N 2 . PD 1 also shows a low dielectric constant (D k ¼ 2.58 at 30 MHz) and high hydrophobicity (a water contact angle of q ¼ 98 ), as well as low water uptake (about 0.45%, kept in boiling water for 72 h). These results suggest that the macromonomer has a potential application in the production of the high performance polymers, in particular, it is very suitable for encapsulation resins or the coatings utilized in the microelectronics industry.Scheme 1 Procedure for the synthesis and conversion of the new monomer D 1 .
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