Diphenolic acid ester polycarbonates

Abstract

SynopsisPolycarbonates of methyl, ethyl, n-propyl, n-butyl, and n-hexyl 4,4bis(4hydroxy-pheny1)pentanoate and copolycarbonates with bisphenol-A of 0.5-0.9 int.rinsic viscosit,y in dioxane were prepared by a homogeneous CH2C12-pyridine method and the physical properties determined. Increasing the number of carbon atoms in the DPA est.er alcohol group from 1 to 6 decreased the initial softening temperature of the polycarbonates from 126 to 58°C.; this change also increased the solubility of the polycarbonates in aromatic solvents and in three ketone solvents. O2 transmission rates were not affected by increasing the ester chain length. C02 transmission rates increased as DPA ester alcohol chain length increased. Methyl DPA polycarbonate had the highest, tensile strength and per tent, elongation and the lowest O2 and COz t.ransmission rates.

Recent Advances in the Value Addition of Biomass‐Derived Levulinic Acid: A Review Focusing on its Chemical Reactivity Patterns

“…[98] In this regard, 4,4'-Bis(4-hydroxyphenyl)pentanoic acid or diphenolic acid (DPA) is considered a suitable replacement for BPA having comparable structure and reactivity. [99][100][101] In addition, DPA has applications in lubricants, adhesives, and paints. [102] Interestingly, DPA had a sizeable market share before being superseded by BPA, largely due to the inexpensive character of the latter.…”

Homo- and Co-Polycarbonates and Blends Derived from Diphenolic Acid

“…The product gave a yield of 8.01 g, (28.6 mmol, 89% yield) with mp = 133-134 • C (literature [5] 133-134 • C ). 1 31.74 (CH 3 -R).…”

“…By esterification of the carboxyl group with methanol, branching would be prevented and a linear polymer should be formed. The methyl ester was formed by refluxing diphenolic acid and methanol with a catalytic amount of TSA [5]: (7) The homopolycarbonate of methyl diphenolate was produced using the same procedure but replacing BPA with the methyl ester of DPA: (8)…”

Interfacial polycondensation of diphenolic acid and isophthaloyl chloride

“…Diphenolic acid (DPA) ester had always been used for the synthesis of polycarbonate since the past four decades 1. In recent years, DPA has been attracted much attention because it can be produced on large scale2 from phenol and levulinic acid, a potential platform chemical from biomass 3.…”

“…Diphenolic acid (DPA) ester had always been used for the synthesis of polycarbonate since the past four decades. 1 In recent years, DPA has been attracted much attention because it can be produced on large scale 2 from phenol and levulinic acid, a potential platform chemical from biomass. 3 It has been used as a new monomer in preparation of reactive aromatic polyesters 4-6 and polycarbonates 7,8 bearing pendent carboxyl groups via interfacial polycondensation as well as hyperbranched polyesters via melt polycondensation.…”