Copolyarylates containing phthalazinone and cardo moieties: An attempt toward the balance between thermal resistance and solubility

A series of copolyarylates containing phthalazinone and cardo moieties are synthesized by interfacial polymerization of terephthaloyl dichloride with bisphenol monomers including 2,4‐(4‐hydroxyphenyl)‐2,3‐phthalazin‐1‐one, 9,9‐bis(4‐hydroxyphenyl) fluorene, and phenolphthalein. The intrinsic viscosi...

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Published in:Journal of polymer science (2020) Vol. 61; no. 22; pp. 2954 - 2964
Main Authors: Xu, Peiqi, Liu, Qian, Wang, Danhui, Li, Hailong, Lv, Fei, Feng, Huimei, Sun, Fanchen, Che, Xuefu, Zhang, Shouhai, Jian, Xigao
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 15-11-2023
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Abstract A series of copolyarylates containing phthalazinone and cardo moieties are synthesized by interfacial polymerization of terephthaloyl dichloride with bisphenol monomers including 2,4‐(4‐hydroxyphenyl)‐2,3‐phthalazin‐1‐one, 9,9‐bis(4‐hydroxyphenyl) fluorene, and phenolphthalein. The intrinsic viscosity and number average molecular weight of copolyarylates are in the range of 0.71–1.01 dL g −1 and 16.3–28.4 kDa, respectively, indicating the formation of medium molecular weight copolymers. The effects of phthalazinone and cardo moieties on the solubility and thermal resistance of copolyarylates are discussed in detail. With only phthalazinone moieties, the polyarylate has high thermal resistance with the glass transition temperature ( T g ) of 335 °C, but poor solubility. The introduction of cardo moieties enables the produced copolyarylates readily soluble in chloroform, 1,1,2,2‐tetrachloroethane, and N ‐methyl‐2‐pyrrolidone, for they not only increase the free volume of intermolecular chains but also lead to a fractional reduction in the structural stiffness of copolymers. Although the decrease in structural stiffness is related to a decrease in T g value, fortunately, the rigid cardo and phthalazinone moieties allow the thermal resistance of copolyarylate to reach the leading level among (co)polyarylates. In addition, the resulting copolyarylates have good tensile properties. These copolyarylates have important application prospects in the high thermal‐resistant material industry.
AbstractList A series of copolyarylates containing phthalazinone and cardo moieties are synthesized by interfacial polymerization of terephthaloyl dichloride with bisphenol monomers including 2,4‐(4‐hydroxyphenyl)‐2,3‐phthalazin‐1‐one, 9,9‐bis(4‐hydroxyphenyl) fluorene, and phenolphthalein. The intrinsic viscosity and number average molecular weight of copolyarylates are in the range of 0.71–1.01 dL g −1 and 16.3–28.4 kDa, respectively, indicating the formation of medium molecular weight copolymers. The effects of phthalazinone and cardo moieties on the solubility and thermal resistance of copolyarylates are discussed in detail. With only phthalazinone moieties, the polyarylate has high thermal resistance with the glass transition temperature ( T g ) of 335 °C, but poor solubility. The introduction of cardo moieties enables the produced copolyarylates readily soluble in chloroform, 1,1,2,2‐tetrachloroethane, and N ‐methyl‐2‐pyrrolidone, for they not only increase the free volume of intermolecular chains but also lead to a fractional reduction in the structural stiffness of copolymers. Although the decrease in structural stiffness is related to a decrease in T g value, fortunately, the rigid cardo and phthalazinone moieties allow the thermal resistance of copolyarylate to reach the leading level among (co)polyarylates. In addition, the resulting copolyarylates have good tensile properties. These copolyarylates have important application prospects in the high thermal‐resistant material industry.
A series of copolyarylates containing phthalazinone and cardo moieties are synthesized by interfacial polymerization of terephthaloyl dichloride with bisphenol monomers including 2,4‐(4‐hydroxyphenyl)‐2,3‐phthalazin‐1‐one, 9,9‐bis(4‐hydroxyphenyl) fluorene, and phenolphthalein. The intrinsic viscosity and number average molecular weight of copolyarylates are in the range of 0.71–1.01 dL g−1 and 16.3–28.4 kDa, respectively, indicating the formation of medium molecular weight copolymers. The effects of phthalazinone and cardo moieties on the solubility and thermal resistance of copolyarylates are discussed in detail. With only phthalazinone moieties, the polyarylate has high thermal resistance with the glass transition temperature (Tg) of 335 °C, but poor solubility. The introduction of cardo moieties enables the produced copolyarylates readily soluble in chloroform, 1,1,2,2‐tetrachloroethane, and N‐methyl‐2‐pyrrolidone, for they not only increase the free volume of intermolecular chains but also lead to a fractional reduction in the structural stiffness of copolymers. Although the decrease in structural stiffness is related to a decrease in Tg value, fortunately, the rigid cardo and phthalazinone moieties allow the thermal resistance of copolyarylate to reach the leading level among (co)polyarylates. In addition, the resulting copolyarylates have good tensile properties. These copolyarylates have important application prospects in the high thermal‐resistant material industry.
Author Liu, Qian
Li, Hailong
Jian, Xigao
Xu, Peiqi
Zhang, Shouhai
Che, Xuefu
Lv, Fei
Sun, Fanchen
Feng, Huimei
Wang, Danhui
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Snippet A series of copolyarylates containing phthalazinone and cardo moieties are synthesized by interfacial polymerization of terephthaloyl dichloride with bisphenol...
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SubjectTerms Chloroform
Copolymers
Dichlorides
Glass transition temperature
Heat transfer
Molecular chains
Molecular weight
Phenolphthalein
Polyarylates
Solubility
Stiffness
Tensile properties
Thermal resistance
Title Copolyarylates containing phthalazinone and cardo moieties: An attempt toward the balance between thermal resistance and solubility
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