“…12 Wei et al adopted biphenylene monomer to prepare biphenyl epoxy (BP-SiH-EP) and T g of BP-SiH-EP is increased by 20°C. 13 Cai and coworkers prepared a series of novel poly(arylene ether ketone)s containing both biphenylene moieties and various moieties in the main chain. T g of the poly(arylene ether ketone)s containing biphenylene moieties were 170°C, a higher value than those of commercially available poly(ether ether ketone) and poly(ether ketone ketone), T g of which are 143 and 156°C, respectively.…”
Section: Introductionmentioning
confidence: 99%
“…Wei et al . adopted biphenylene monomer to prepare biphenyl epoxy (BP‐SiH‐EP) and T g of BP‐SiH‐EP is increased by 20 °C 13 . Cai and co‐workers prepared a series of novel poly(arylene ether ketone)s containing both biphenylene moieties and various moieties in the main chain.…”
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4 0-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4 0-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300°C, and BDS-PDBES can still maintain its 30% storage modulus at 295°C. In addition, the two novel polymers also show excellent thermal stability (T d5 = 526°C), high elongation at break (ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity (⊗ 300°C = 0.28 W •m −1 •K −1).
“…12 Wei et al adopted biphenylene monomer to prepare biphenyl epoxy (BP-SiH-EP) and T g of BP-SiH-EP is increased by 20°C. 13 Cai and coworkers prepared a series of novel poly(arylene ether ketone)s containing both biphenylene moieties and various moieties in the main chain. T g of the poly(arylene ether ketone)s containing biphenylene moieties were 170°C, a higher value than those of commercially available poly(ether ether ketone) and poly(ether ketone ketone), T g of which are 143 and 156°C, respectively.…”
Section: Introductionmentioning
confidence: 99%
“…Wei et al . adopted biphenylene monomer to prepare biphenyl epoxy (BP‐SiH‐EP) and T g of BP‐SiH‐EP is increased by 20 °C 13 . Cai and co‐workers prepared a series of novel poly(arylene ether ketone)s containing both biphenylene moieties and various moieties in the main chain.…”
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4 0-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4 0-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300°C, and BDS-PDBES can still maintain its 30% storage modulus at 295°C. In addition, the two novel polymers also show excellent thermal stability (T d5 = 526°C), high elongation at break (ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity (⊗ 300°C = 0.28 W •m −1 •K −1).
“…At first, it increased with the increasing of ND molar ratio and then decreased, and BP85 had the highest T g . It could be explained that BP and ND were both monomers with relatively high symmetrical structure, and the rigidity of the copolymers was increased due to the introduction of double benzene nucleus, 10,11 so T g showed an upward trend. Existing articles showed that it was much easy to produce circulating oligomers of ND in the reaction process, 12 which resulted in the decrease of T g , despite that the molar ratio of ND continued to increase.Figure 5.The DSC curves of the PEN copolymers.…”
Section: Resultsmentioning
confidence: 99%
“…BP-PEN is a new type of semi-crystalline PEN with high thermal stability, strong rigidity, and great intensity. 9,10 As a kind of semi-crystalline polymer material, the molecular chain of BP-PEN is relatively regulated; thus, BP-PEN has excellent heat resistance and mechanical property than those of amorphous PEN. ND-PEN is also a kind of crystalline PEN with both nice mechanical and thermal properties.…”
A novel series of polyarylene ether nitrile (PEN) random copolymers with a higher Tg and better mechanical and electrical properties were synthesized through nucleophilic substitution polycondensation. In the means of adjusting mole ratio of 4,4′-dihydroxybiphenyl (BP) to 2,7-naphthalenediol (ND), the performance of PEN random copolymer could be controlled. The FTIR, SEM, DSC, TGA, AR, intrinsic viscosity, and electrical and mechanical properties were performed on the samples. All the samples exhibited excellent thermal performance with Tg over 210°C, Td5% over 520°C, and heat conduction higher than 0.4 W/m·k. The PEN copolymers when the molar ratio of ND was 15% had the best comprehensive performances, whose Tg was 215°C, Td5% was up to 554.31°C, thermal conductivity was 0.4430 W/m·k, tensile strength was 113.27 MPa, and stable dielectric constant (at frequency from 103 Hz to 106 Hz) was lower than 4. As a result, this PEN copolymer obtained in this paper could provide practical value and possibility in further application in the filed including machine manufacture industry, electronic materials, and automotive industry.
“…Figure shows a schematic diagram of the redistribution reaction of PPO promoted by BPA, using BPO as a free radical initiator. The resultant free radicals attack the PPO molecules, causing it to fragment into smaller radical chains that are then terminated by reaction with BPA to afford hydroxyl‐terminated rPPO .…”
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