Temperature Dependence Characteristics of Biodegradable Polycaprolactone Grafted Propargyl Dehydroabietic Ester (PCL-g-DAPE). Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Hamidi, Nasrollah; Edmonds, Shantavia; Frazier, Victoria; Clemons, Felecia
• Is Part Of: Journal of macromolecular science. Volume 57:Issue 2(2018)
• Page Start: 129
• Page End: 150
• Publication Date: 2018-02-01
• Subjects: Biodegradable polymers -- polycaprolactone grafted propargyl dehydroabietic ester -- polymer rigidity -- intrinsic viscosity -- end-to-end dimentions; Polymerization -- Periodicals; Polymers -- Periodicals; 530.413
• DOI: 10.1080/00222348.2018.1429750
• Languages: English
• ISSNs: 0022-2348

Abstract

ABSTRACT: A sample of propargyl dehydroabietic ester grafted to α-azide substituted poly(ϵ-caprolactone) (PCL-g-DAPE) in THF was characterized at 24°C, 30°C, 40°C, 50°C by a combination of on-line measurement of intrinsic viscosity, refractive index and two-angle light scattering in a size exclusion chromatograph. The weight average molecular weight ( w ), intrinsic viscosity ([η]), hydrodynamic radius (RH ), and concentration of the polymer fractions were obtained from corresponding traces of the chromatograms. The data were used to construct double logarithmic plots of w versus [η], and w versus RH, as well as Stockmayer-Fixman plots, to scale the intrinsic viscosity, hydrodynamic radii and dimensions of the PCL-g-DAPE chains to molar mass. The results indicated that PCL-g-DAPE was more rigid than the parent PCL; however, PCL-g-DAPE can be classified as a flexible-coil polymer, similar to poly(methyl acrylate). The PCL-g-DAPE stiffness was related to the chemical structure of the bulky side chains that induced preferential conformation correlations of the polymer backbones in solution. The PCL-g-DAPE –THF system behaved as a lower critical consolute solution system with highest miscibility around 30°C, judged based on the slope of double logarithmic plots of molecular weight and intrinsic viscosity. Moreover, a transition in the conformation of the PCL-g-DAPE in THF at 30°C was observed.