Biodegradable poly(L-lactide) composites by oligolactide-grafted magnesium hydroxide for mechanical reinforcement and reduced inflammation

Title
Biodegradable poly(L-lactide) composites by oligolactide-grafted magnesium hydroxide for mechanical reinforcement and reduced inflammation
Authors
금창헌조영진정윤기최지연박귀덕서성호박용식안동준한동근
Keywords
Biodegradablepoly
Issue Date
2013-06
Publisher
Journal of materials chemistry. B, Materials for biology and medicine
Citation
VOL 1, NO 21, 2764-2772
Abstract
Biodegradable polymers, such as poly(L-lactide) (PLLA), are very useful in many biomedical applications. However, their degradation by-products have been much of a concern as they are the sources of inflammatory reactions in the body. In this work, we suggest a novel composite system composed of PLLA and oligolactide-grafted magnesium hydroxide (Mg-OLA) that can overcome drawbacks caused by poor mechanical properties and inflammatory response of PLLA for biomedical applications. Mg-OLAs were synthesized by ring opening polymerization and the structure, morphology, pH change, thermal, and mechanical properties were analyzed using FTIR, SEM, pH meter, TGA, and UTM. In particular, the tensile strength and modulus of PLLA/Mg80-OLA20 (0–20 wt%) were higher than those of PLLA/magnesium hydroxide. The PLLA/Mg80-OLA20 composite was also very effective in neutralizing the acidic environment caused by the degradable by-product of the PLLA matrix. In vitro cell viability and the expression levels of COX-2 and IL-6 proteins in the PLLA composites were also evaluated. Cell viability increased to around 100% with increasing the amount of Mg80-OLA20 from 0 to 20 wt%. The expression levels of IL-6 and COX-2 were reduced dramatically when increasing the proportion of Mg80-OLA20 from 0 to 50 wt%. As a result, the incorporation of Mg-OLAs into the PLLA matrix could reinforce the mechanical properties as well as reduce the inflammatory response of the hybrid PLLA. Therefore, this hybrid composite system blending oligomer-grafted magnesium hydroxide in biodegradable polymers would be a promising strategy for avoiding current fatal problems in biomedical applications.
URI
http://pubs.kist.re.kr/handle/201004/46689
ISSN
2050750x
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KIST Publication > Article
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