TY - JOUR
T1 - Systematic examination of thermal, mechanical and dielectrical properties of aromatic polybenzoxazines
AU - Hamerton, Ian
AU - Howlin, Brendan J.
AU - Mitchell, Amy L.
AU - McNamara, Lisa T.
AU - Takeda, Shinji
PY - 2012/10
Y1 - 2012/10
N2 - A series of bis-benzoxazines, prepared in high yield and purity using two synthetic procedures, is reported. Differential scanning calorimetry reveals similar temperatures for the onset of polymerisation (162-180 °C); the higher values representing monomers containing polar bridges or rigid backbones. Dynamic viscoelasticity data reveal glass transition temperatures for the polybenzoxazines ranging from 187 °C to 235 °C; a fluorinated polybenzoxazine consistently yields the highest T g of the polymers studied. The latter is interesting since it is superior to many commercial benzoxazines with a relatively high T g (235 °C), flexural modulus (5.0 GPa) and flexural strength (146.7 MPa), but coupled with a breaking strain (3.06%) that is uncharacteristically high for polybenzoxazines. The incorporation of fluorine results in a low dielectric loss properties (D k = 3.71-4.12 at 10 MHz, D f = 0.0109 - 0.0980 at 10 MHz), which are comparable with commercial polybenzoxazines, FR4 and aerospace epoxy resins and superior to commercial bismaleimides.
AB - A series of bis-benzoxazines, prepared in high yield and purity using two synthetic procedures, is reported. Differential scanning calorimetry reveals similar temperatures for the onset of polymerisation (162-180 °C); the higher values representing monomers containing polar bridges or rigid backbones. Dynamic viscoelasticity data reveal glass transition temperatures for the polybenzoxazines ranging from 187 °C to 235 °C; a fluorinated polybenzoxazine consistently yields the highest T g of the polymers studied. The latter is interesting since it is superior to many commercial benzoxazines with a relatively high T g (235 °C), flexural modulus (5.0 GPa) and flexural strength (146.7 MPa), but coupled with a breaking strain (3.06%) that is uncharacteristically high for polybenzoxazines. The incorporation of fluorine results in a low dielectric loss properties (D k = 3.71-4.12 at 10 MHz, D f = 0.0109 - 0.0980 at 10 MHz), which are comparable with commercial polybenzoxazines, FR4 and aerospace epoxy resins and superior to commercial bismaleimides.
KW - Dielectric properties
KW - Mechanical properties
KW - Molecular simulation
KW - Polybenzoxazines
KW - Thermal analysis
UR - http://www.scopus.com/inward/record.url?scp=84865750576&partnerID=8YFLogxK
U2 - 10.1016/j.reactfunctpolym.2012.07.001
DO - 10.1016/j.reactfunctpolym.2012.07.001
M3 - Article (Academic Journal)
AN - SCOPUS:84865750576
SN - 1381-5148
VL - 72
SP - 736
EP - 744
JO - Reactive and Functional Polymers
JF - Reactive and Functional Polymers
IS - 10
ER -