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3444990 
Journal Article 
Cyanate ester resin modified by phenolic resin containing diphenyl oxide segments with high molecular weight 
Tu, Y; Yu, R; Duan, J; Hu, Lin 
2016 
Yes 
Iranian Polymer Journal
ISSN: 1026-1265 
25 
10 
863-873 
WOS:000384823400005 
To obtain modified cyanate ester (CE) with good comprehensive properties and low cost, a novel phenolic resin containing diphenyl oxide (MPF) with high molecular weight was synthesized from diphenyl ether, formaldehyde, methanol and phenol by a two-step process which differed from polyphenylene oxide (PPO) in structure. The curing reaction and properties of the modified 2,2-bis(4-cyanatophenyl) propane (bisphenol-A-based cyanate ester, BADCy) by MPF were investigated. It was found that the curing temperature of the modified CE was lower than that of the unmodified CE. When the ratio of MPF and BADCy was 3: 7, the cured resin exhibited low dielectric constant (3.00), low dielectric loss (0.0062) and high impact strength (12.5 kJ/m2), and its T-d5% was 371 degrees C, being superior to CE in the comprehensive properties. When the content of MPF was above 30 %, MPF/BADCy had poor comprehensive properties. In order to improve MPF/BADCy with high content of MPF, epoxy resin (E51) was added. When the ratio of MPF, BADCy and E51 was 50: 50: 67, the cured resin exhibited low dielectric constant (2.96), dielectric loss (0.0078) and high impact strength (11.84 kJ/m(2)), and its T-d5% was 365 degrees C. Small content of MPF or the combination of E51 and MPF were good for BADCy to improve its comprehensive properties. 
Phenolic resin; Diphenyl ether; Cyanate ester resin; Dielectric property; Impact strength