Synthesis and properties of phosphorus-containing epoxy resins by novel method

Phosphorous‐containing epoxy resins from a novel synthesis route

“…This uncommon result could be understood by the hindrance effect of the bulky DOPO group. A similar result was also seen in the reported result, in which a DOPO‐containing epoxy cured with PN showing relatively low T g 16, 19…”

“…The relatively high T g s of the DOPO‐E‐I–based epoxy resins should come from the high rigidity of the DOPO group. Owing to reducing crosslinking density, it was observed that introducing DOPO group into the epoxy resin systems resulted in polymers with low T g s in other works 16, 19. However, this flaw did not appear in the present study.…”

Phosphorous‐containing epoxy resins from a novel synthesis route

“…This uncommon result could be understood by the hindrance effect of the bulky DOPO group. A similar result was also seen in the reported result, in which a DOPO‐containing epoxy cured with PN showing relatively low T g 16, 19…”

“…The relatively high T g s of the DOPO‐E‐I–based epoxy resins should come from the high rigidity of the DOPO group. Owing to reducing crosslinking density, it was observed that introducing DOPO group into the epoxy resin systems resulted in polymers with low T g s in other works 16, 19. However, this flaw did not appear in the present study.…”

Flame retardancy and thermal properties of organoclay and phosphorous compound synergistically modified epoxy resin

“…In the synthetic process, the electrophilic active hydrogens in DOPO served as a reactive site for the epoxy group in DGEBA. As reported by Wang et al ., the strong peaks in FTIR spectra at 2435.34 and 759.46 cm −1 are assigned to the PH and POPh bonds, respectively, which are also observed in the FTIR spectrum of DOPO as shown in Figure . Nevertheless, after the reaction with DGEBA, the peak of PH bond disappears.…”

Low dielectric and flame‐retardant properties of thermosetting redistributed poly(phenylene oxide)

“…The results may be attributed to a reduction in crosslink density caused by the incorporation of monofunctional allyl-DOPO into MA-PPO/TAIC. In addition, the bulky phosphorus-containing cyclic structure of the DOPO group also led to more spacing between the polymer molecules [15] and resulted in a less efficient chain packing. This change, in turn, reduced the glass transition temperature of the allyl-DOPO-modified MA-PPO/TAIC systems.…”

Phosphorous‐containing epoxy resins from a novel synthesis route

“…This uncommon result could be understood by the hindrance effect of the bulky DOPO group. A similar result was also seen in the reported result, in which a DOPO‐containing epoxy cured with PN showing relatively low T g 16, 19…”

“…The relatively high T g s of the DOPO‐E‐I–based epoxy resins should come from the high rigidity of the DOPO group. Owing to reducing crosslinking density, it was observed that introducing DOPO group into the epoxy resin systems resulted in polymers with low T g s in other works 16, 19. However, this flaw did not appear in the present study.…”

Flame retardancy and thermal properties of organoclay and phosphorous compound synergistically modified epoxy resin

“…In the synthetic process, the electrophilic active hydrogens in DOPO served as a reactive site for the epoxy group in DGEBA. As reported by Wang et al ., the strong peaks in FTIR spectra at 2435.34 and 759.46 cm −1 are assigned to the PH and POPh bonds, respectively, which are also observed in the FTIR spectrum of DOPO as shown in Figure . Nevertheless, after the reaction with DGEBA, the peak of PH bond disappears.…”

Low dielectric and flame‐retardant properties of thermosetting redistributed poly(phenylene oxide)

“…The results may be attributed to a reduction in crosslink density caused by the incorporation of monofunctional allyl-DOPO into MA-PPO/TAIC. In addition, the bulky phosphorus-containing cyclic structure of the DOPO group also led to more spacing between the polymer molecules [15] and resulted in a less efficient chain packing. This change, in turn, reduced the glass transition temperature of the allyl-DOPO-modified MA-PPO/TAIC systems.…”

Phosphorous‐containing epoxy resins from a novel synthesis route

“…This uncommon result could be understood by the hindrance effect of the bulky DOPO group. A similar result was also seen in the reported result, in which a DOPO‐containing epoxy cured with PN showing relatively low T g 16, 19…”

“…The relatively high T g s of the DOPO‐E‐I–based epoxy resins should come from the high rigidity of the DOPO group. Owing to reducing crosslinking density, it was observed that introducing DOPO group into the epoxy resin systems resulted in polymers with low T g s in other works 16, 19. However, this flaw did not appear in the present study.…”

Flame retardancy and thermal properties of organoclay and phosphorous compound synergistically modified epoxy resin

“…In the synthetic process, the electrophilic active hydrogens in DOPO served as a reactive site for the epoxy group in DGEBA. As reported by Wang et al ., the strong peaks in FTIR spectra at 2435.34 and 759.46 cm −1 are assigned to the PH and POPh bonds, respectively, which are also observed in the FTIR spectrum of DOPO as shown in Figure . Nevertheless, after the reaction with DGEBA, the peak of PH bond disappears.…”

Low dielectric and flame‐retardant properties of thermosetting redistributed poly(phenylene oxide)

“…The results may be attributed to a reduction in crosslink density caused by the incorporation of monofunctional allyl-DOPO into MA-PPO/TAIC. In addition, the bulky phosphorus-containing cyclic structure of the DOPO group also led to more spacing between the polymer molecules [15] and resulted in a less efficient chain packing. This change, in turn, reduced the glass transition temperature of the allyl-DOPO-modified MA-PPO/TAIC systems.…”