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telomerization of Acrylic Acid with mercaptans part 2 kinetics of the synthesis of star shaped macromolecules of Acrylic Acid

The telomerization of Acrylic Acid with a polyfunctional transfer agent initiated by 2,2′-azobisisobutyronitrile, was first investigated in an organic medium (THF) at 65 °C. Transfer constants (CT) for three mercaptans, ethylene glycol bisthioglycolate, trimethylolpropane tris(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate) of about 6.1, 6.3 and 7.3, respectively, were determined. From these results, it followed that a well-defined star poly(Acrylic Acid) could not be synthesized via telomerization of Acrylic Acid in THF. Nevertheless, the same study was performed with the tetrafunctional transfer agent in water/THF mixtures. This work emphasized that the nature of the solvent plays an important role in determining the transfer constant. Thus, the value of CT for the tetrafunctional transfer agent decreased from 7.3 in THF to 1, the ‘ideal’ case for telomerization (CT ≈ 1), for the mixture of solvents water/THF (80%, 20%, v/v). With this route, it seems that Acrylic Acid star-shaped macromolecules could be synthesized via telomerization.

© 2001 Society of Chemical Industry

Telomerization of Acrylic Acid with mercaptans: Part 2. Kinetics of the synthesis of star‐shaped macromolecules of Acrylic Acid

The telomerization of Acrylic Acid with a polyfunctional transfer agent initiated by 2,2′-azobisisobutyronitrile, was first investigated in an organic medium (THF) at 65 °C. Transfer constants (CT) for three mercaptans, ethylene glycol bisthioglycolate, trimethylolpropane tris(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate) of about 6.1, 6.3 and 7.3, respectively, were determined. From these results, it followed that a well-defined star poly(Acrylic Acid) could not be synthesized via telomerization of Acrylic Acid in THF. Nevertheless, the same study was performed with the tetrafunctional transfer agent in water/THF mixtures. This work emphasized that the nature of the solvent plays an important role in determining the transfer constant. Thus, the value of CT for the tetrafunctional transfer agent decreased from 7.3 in THF to 1, the ‘ideal’ case for telomerization (CT ≈ 1), for the mixture of solvents water/THF (80%, 20%, v/v). With this route, it seems that Acrylic Acid star-shaped macromolecules could be synthesized via telomerization.

© 2001 Society of Chemical Industry

Effect of Acrylic Acid content in poly(ethylene-ran-Acrylic Acid) on the morphology and mechanical properties of poly(ethylene-ran-Acrylic Acid)/polystyrene blends compatibilized by poly(styrene-ran-glycidyl methacrylate)

Abstract Three poly(ethylene-ran-Acrylic Acid)s (PE-AAs) with different amounts of Acrylic Acid but exhibiting similar rheological properties were studied to investigate the effect of Acrylic Acid content in PE-AAs on the morphology and mechanical properties of PE-AA/polystyrene (PS) blend compatibilized by poly(styrene-ran-glycidyl methacrylate) (PS-GMA). From morphological observations, there appears to be an optimum amount of Acrylic Acid in PE-AA that effectively reduces the dispersed domain size in PE-AA/PS blend systems. The existence of an optimum value is due to the combined effects of a sufficient reaction near the interface giving enough amounts of graft copolymers as a compatibilizer between PE-AA and PS, and fast diffusion of reactive species toward the interface. However, the tensile strength (σb) and the elongation at break (ϵb) for these blend systems steadily increased with an increase in the amount of Acrylic Acid in PE-AA. By increasing the amount of PS-GMA, σb and ϵb for all blend systems increased rapidly, and then levelled off. Impact strength of these blend systems was investigated by varying them amount of Acrylic Acid in PE-AA.

telomerization of Acrylic Acid with mercaptans part 2 kinetics of the synthesis of star shaped macromolecules of Acrylic Acid

The telomerization of Acrylic Acid with a polyfunctional transfer agent initiated by 2,2′-azobisisobutyronitrile, was first investigated in an organic medium (THF) at 65 °C. Transfer constants (CT) for three mercaptans, ethylene glycol bisthioglycolate, trimethylolpropane tris(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate) of about 6.1, 6.3 and 7.3, respectively, were determined. From these results, it followed that a well-defined star poly(Acrylic Acid) could not be synthesized via telomerization of Acrylic Acid in THF. Nevertheless, the same study was performed with the tetrafunctional transfer agent in water/THF mixtures. This work emphasized that the nature of the solvent plays an important role in determining the transfer constant. Thus, the value of CT for the tetrafunctional transfer agent decreased from 7.3 in THF to 1, the ‘ideal’ case for telomerization (CT ≈ 1), for the mixture of solvents water/THF (80%, 20%, v/v). With this route, it seems that Acrylic Acid star-shaped macromolecules could be synthesized via telomerization.

© 2001 Society of Chemical Industry

Telomerization of Acrylic Acid with mercaptans: Part 2. Kinetics of the synthesis of star‐shaped macromolecules of Acrylic Acid

The telomerization of Acrylic Acid with a polyfunctional transfer agent initiated by 2,2′-azobisisobutyronitrile, was first investigated in an organic medium (THF) at 65 °C. Transfer constants (CT) for three mercaptans, ethylene glycol bisthioglycolate, trimethylolpropane tris(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate) of about 6.1, 6.3 and 7.3, respectively, were determined. From these results, it followed that a well-defined star poly(Acrylic Acid) could not be synthesized via telomerization of Acrylic Acid in THF. Nevertheless, the same study was performed with the tetrafunctional transfer agent in water/THF mixtures. This work emphasized that the nature of the solvent plays an important role in determining the transfer constant. Thus, the value of CT for the tetrafunctional transfer agent decreased from 7.3 in THF to 1, the ‘ideal’ case for telomerization (CT ≈ 1), for the mixture of solvents water/THF (80%, 20%, v/v). With this route, it seems that Acrylic Acid star-shaped macromolecules could be synthesized via telomerization.

© 2001 Society of Chemical Industry