Abstract:A series of phenolphthalein-containing bismaleimide (PPBMI) reinforced polydicyclopentadiene blends (PPBMI/polyDCPD) were prepared via the ring-opening metathesis polymerization of DCPD in the presence of PPBMI. The crosslinked networks between PPBMI and polyDCPD backbones resulted in the reinforced structures. The curing behavior, thermal, and mechanical properties were investigated. Differential scanning calorimetry investigations showed the samples exhibit similar singular exothermic peak, and the exothermi… Show more
“…When the temperature reached 450°C, the PDCPD network structure collapsed and the unreacted phenolic resin decomposed, so the stability of PDCPD modified by phenolic resin was low at this temperature. 24,25 Figure 4.TG curves of PDCPD and PDCPD/PF interpenetrating network polymers.…”
Section: Resultsmentioning
confidence: 99%
“…When the temperature reached 450°C, the PDCPD network structure collapsed and the unreacted phenolic resin decomposed, so the stability of PDCPD modified by phenolic resin was low at this temperature. 24,25 Differential scanning calorimetry analysis Differential scanning calorimetry (DSC) is an effective method to characterise the compatibility of blends. The dispersion of PF in DCPD can be proved by DSC characterisation.…”
In this paper, phenolic resin (PF) and dicyclopentadiene (DCPD) monomers were mixed in different proportions. Under the action of a new generation of ruthenium carbene catalysts, DCPD was polymerised in situ. Polydicyclopentadiene (PDCPD)/PF interpenetrating polymer networks (IPNs) were prepared using the casting curing moulding process. The structure and properties of the prepared IPNs were characterised using Fourier infrared spectroscopy (FT-IR), apparent crosslinking degree, thermal weight loss, mechanical properties, impact resistance and scanning electron microscopy (SEM). The study results showed that the conversion of DCPD did not change with the addition of PF. But when its content exceeds 10%, the crosslinking degree of PDCPD decreases. When the PF content is 10%, the maximum bending strength of PDCPD/PF IPNs is (104.5 ± 1.3) MPa, maximum tensile strength is (74.5 ± 1.4) MPa, and maximum-notched impact strength is (4.2 ± 0.2) kJ/m2. Compared with PDCPD, the bending strength is increased by 22.7%, tensile strength is increased by 32.6%, and notched impact strength is increased by 31.3%, but the thermal stability has no major impact at this time. PF has good dispersibility and compatibility in DCPD. Due to the interpenetrating network structure of PF and PDCPD, the interpenetrating interlocking of the PF molecular chain and PDCPD crosslinked network restricts its movement. Its performance reached the optimum, and the PDCPD/PF IPNs with excellent performance was successfully prepared.
“…When the temperature reached 450°C, the PDCPD network structure collapsed and the unreacted phenolic resin decomposed, so the stability of PDCPD modified by phenolic resin was low at this temperature. 24,25 Figure 4.TG curves of PDCPD and PDCPD/PF interpenetrating network polymers.…”
Section: Resultsmentioning
confidence: 99%
“…When the temperature reached 450°C, the PDCPD network structure collapsed and the unreacted phenolic resin decomposed, so the stability of PDCPD modified by phenolic resin was low at this temperature. 24,25 Differential scanning calorimetry analysis Differential scanning calorimetry (DSC) is an effective method to characterise the compatibility of blends. The dispersion of PF in DCPD can be proved by DSC characterisation.…”
In this paper, phenolic resin (PF) and dicyclopentadiene (DCPD) monomers were mixed in different proportions. Under the action of a new generation of ruthenium carbene catalysts, DCPD was polymerised in situ. Polydicyclopentadiene (PDCPD)/PF interpenetrating polymer networks (IPNs) were prepared using the casting curing moulding process. The structure and properties of the prepared IPNs were characterised using Fourier infrared spectroscopy (FT-IR), apparent crosslinking degree, thermal weight loss, mechanical properties, impact resistance and scanning electron microscopy (SEM). The study results showed that the conversion of DCPD did not change with the addition of PF. But when its content exceeds 10%, the crosslinking degree of PDCPD decreases. When the PF content is 10%, the maximum bending strength of PDCPD/PF IPNs is (104.5 ± 1.3) MPa, maximum tensile strength is (74.5 ± 1.4) MPa, and maximum-notched impact strength is (4.2 ± 0.2) kJ/m2. Compared with PDCPD, the bending strength is increased by 22.7%, tensile strength is increased by 32.6%, and notched impact strength is increased by 31.3%, but the thermal stability has no major impact at this time. PF has good dispersibility and compatibility in DCPD. Due to the interpenetrating network structure of PF and PDCPD, the interpenetrating interlocking of the PF molecular chain and PDCPD crosslinked network restricts its movement. Its performance reached the optimum, and the PDCPD/PF IPNs with excellent performance was successfully prepared.
“…Dicyclopentadiene (DCPD) petroleum resin is produced by polymerization of C 5 fraction monomer, which is the byproduct derived from the steam cracking unit. , DCPD resin is widely used in hot-melt adhesives, coating agents, paints, rubber, inks, and other fields. − However, DCPD resin without any post-treatment is usually yellow and gives off an unfriendly smell due to the presence of unsaturated CC bonds. , The catalytic hydrogenation is a common strategy to enhance the properties of petroleum resin in terms of weather resistance, stability, and compatibility. − Yuan et al prepared a series of Ni-based materials with high dispersion using layered materials as precursors, ,, and Wang et al constructed a series of Ni catalysts using supports with high specific surface area, ,− all of which were aimed at improving the utilization efficiency of active sites as much as possible. However, due to the difference in intrinsic activity, Ni-based catalysts often require higher content in use and their sulfur resistance needs to be enhanced.…”
The catalytic hydrogenation of unsaturated bonds in petroleum resin is a promising way to enhance the properties of petroleum resin in terms of weather resistance, stability, and compatibility. However, the presence of sulfur compounds in petroleum resin poses a high challenge to hydrogenation catalysts. Herein, based on the cation-tunability of hydrotalcite-like compounds, a series of PdNi bimetallic catalysts are prepared by calcination−reduction of their hydrotalcite-like precursors and applied in the hydrogenation of dicyclopentadiene (DCPD) petroleum resin. By tuning the molar ratios of Pd/Ni and optimizing the reaction conditions, the optimal Pd 1 Ni 1 −MgAlO− HT catalyst can obtain the hydrogenated DCPD petroleum resin with saturation up to 91.5% at 255 °C, 10 MPa H 2 pressure, and 3 h reaction time with the presence of 50 ppm sulfur compound. As compared with the monometallic catalyst, the PdNi bimetallic catalyst presents higher sulfur tolerance in the hydrogenation of DCPD petroleum resin. Combined with the analysis results of XRD, XPS, TEM, and H 2 -TPR, the enhanced catalytic performance of the Pd 1 Ni 1 −MgAlO−HT catalyst can be attributed to the small particle size, high dispersion of metal particles, and the synergy effect between Pd and Ni species. This work will guide to design a highly efficient sulfur tolerance catalyst derived from the hydrotalcite-like precursor for the hydrogenation of polymers.
“…Dicyclopentadiene (DCPD) petroleum resin is a kind of highly crosslinked thermoplastic polymer, which is obtained from the ring‐opening metathesis polymerization of monomer DCPD ,. Its structure retains the double bond contained in the monomer, which makes it readily to oxidize, resulting in poor thermal stability and dark color .…”
Dicyclopentadiene (DCPD) resin polymerized by DCPD contains a large number of unsaturated bonds, hydrogenation plays an important role in enhancing its thermal stability and decoloring. Herein, a series of supported Cu−Ni‐Al catalysts with high distribution and large surface areas derived from direct reduction of hydrotalcite‐like compounds have been synthesized. The hydrogenation properties of supported Cu−Ni‐Al catalysts for the DCPD resin and its monomer have been investigated. The Cu1Ni3‐Al2O3 catalyst shows the highest DCPD conversion (>99%) and selectivity to tetrahydrodicyclopentadiene (THDCPD) (>98%) under mild conditions (40 °C, 2 MPa H2) compared with the corresponding catalysts prepared by impregnation and mechanically mixed method. Due to the high particle dispersion of active‐sites and the synergistic effect between metallic Cu and Ni, the optimal catalyst (Cu1Ni3‐Al2O3) also presents an expected catalytic activity in the hydrogenation of DCPD resin.
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