binding pattern (see in the discussion above), resulting in increased stabilization of the complex by allowing more favourable conformations of the more bulky side chain of these ligands, leading to an additional Cs cation interaction with the [pi]-electron density of the benzene ring
2] and benzene ring
that are attached to oxazine, respectively, were decreased after heat treatment at 100[degrees]C for 1 h.
But the crossed retorts and benzene ring
were not popular with all who wore it.
Different from the isopropyl in bisphenol-A, the fluorenyl moiety in BHPF is a bulky group with high rigidity which can be used for improving the thermal properties of polybenzoxazine because of the steric hindrance and high content of benzene rings
1)] is stretching vibration absorption signal corresponding to C--H in benzene ring
2] band of the benzene ring
of AO-80 and phenol, respectively.
From Table 3, it should be noted that a slight maximum is observed in storage modulus of cured XPBZAs as the content of acetylene group increased, suggesting that the crosslink density of cured XPBZAs was increased with content of acetylene group increasing, and initially, the storage modulus increased with content of acetylene group up to 20% (XPBZA20), which is due to the increase in crosslink density, and then the storage modulus decreases because of high content of benzene ring
and a highly crosslinked network structure formed from polymerization of acetyiene group, which render the material brittle (27), (28).
The benzene ring
is susceptible to electrophilic attack primarily because of its exposed [pi] electrons.
These explosives have a molecular structure consisting of an aromatic or benzene ring
of six carbon atoms to which nitro (NO2) and sometimes other chemical groups are attached.
The two reflections investigated are (105) whose plane normal is close to the chain axes and (100) whose plane normal is close to the normal to the benzene ring
1] band is related to the benzene ring
C-H in-plane bending.
59 ppm) in the range of 140-145 ppm, which is assigned to the fourth carbon atom of the benzene ring
in the p-position.