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Preparation of porous poly(lactic acid)/Sio 2 hybrid microspheres
Author(s) -
Wang Hualin,
Fang Mingshan,
Shi Tiejun,
Zhai Linfeng,
Tang Chao
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.24122
Subject(s) - materials science , differential scanning calorimetry , chemical engineering , scanning electron microscope , adsorption , emulsion , fourier transform infrared spectroscopy , porosity , polymer chemistry , nuclear chemistry , composite material , chemistry , organic chemistry , physics , engineering , thermodynamics
Abstract With 3‐aminopropyltriethoxysilane (APTES) as coupling agent, poly(lactic acid) (PLA)/SiO 2 hybrid material was prepared to produce poly(lactic acid)/SiO 2 hybrid microspheres (PLAHs) with porous structure bythe oil‐in‐water, single‐emulsion solvent evaporation method. Field scanning electron microscopy results show that the PLAHs were porous microspheres about 20 μm in diameter. The holes in the PLAHs opened outside and were not complicated. A nitrogen adsorption–desorption experiment showed that the nitrogen adsorbed in the holes was easily desorbed, and the specific surface area of the PLAHs was calculated to be 6.87 m 2 /g according to the Brunauer–Emmett–Teller equation. Fourier transform infrared spectroscopy results show that PLA was amidated with APTES successfully and formed a kind of organic–inorganic hybrid material by hydrolysis and con‐condensation with tetraethoxysilane. Moreover, the molecular structure of the hybrid material was confirmed by X‐ray photoelectron spectroscopy. Differential scanning calorimetry results show that the melting point ofthe PLAHs was higher than that of PLA by about 11.2°C. These PLAHs may be used in the controlled release of drugs by the embedding of the drugs in the holes of the PLAHs, and the drug loading amount can be controlled by the size and number of holes in the PLAHs. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 679–683, 2006