Hydrolytic Degradation of Poly(L-Lactide-co-Glycolide) Studied by Positron Annihilation Lifetime Spectroscopy and Other Techniques

• Authors: E. Pamuła , E. Dryzek , P. Dobrzyński
• Languages of publication: EN

Abstracts

EN

Changes of the poly(L-lactide-co-glycolide) structure as a function of degradation time in phosphate-buffered saline for 7 weeks were investigated by gel permeation chromatography, differential scanning calorimetry, nuclear magnetic resonance (^1H NMR), and positron annihilation lifetime spectroscopy. Surface properties as wettability by sessile drop and topography by atomic force microscopy were also characterized. Chain-scission of polyester bonds in hydrolysis reaction causes a quite uniform decrease in molecular weight, and finally results in an increase in semicrystallinity. Molecular composition of the copolymer and water contact angle do not change considerably during degradation time. Atomic force microscopy studies suggest that the copolymer degrades by "in bulk" mechanism. The average size of the molecular-level free volume holes declines considerably after one week of degradation and remains constant till the sixth week of degradation. The free volume fraction decreases as a function of degradation time.

Keywords

EN

82.35.-x; 82.35.Lr; 78.70.Bj; 61.18.Fs; 82.56.Ub; 83.85.Jn; 68.37.Ps

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 82.35.Lr: Physical properties of polymers
• 82.35.-x: Polymers: properties; reactions; polymerization(for polymers in electrochemistry, see 82.45.Wx)
• 82.56.Ub: Structure determination with NMR
• 68.37.Ps: Atomic force microscopy (AFM)
• 83.85.Jn: Viscosity measurements

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 110
• Issue: 5
• Pages: 631-640

Dates

published

2006-11

received

2006-06-05

Contributors

author

E. Pamuła

• Faculty of Materials Science and Ceramics, Department of Biomaterials, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

author

E. Dryzek

• Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland

author

P. Dobrzyński

• Centre of Polymer Chemistry, Polish Academy of Sciences, Curie-Skłodowskiej 34/20, 41-819 Zabrze, Poland

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Identifiers

DOI

10.12693/APhysPolA.110.631