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Nano-apatite/polymer composites: mechanical and physicochemical characteristics
Q Liu1, J R de Wijn, C A van Blitterswijk
1Biomaterials Research Group, Leiden University, Bilthoven, The Netherlands.
Biomaterials
|November 5, 1997
Summary
Nano-apatite (Nap) enhances polymer calcification but shows limited stiffening due to water absorption. Surface modification is needed for better polymer reinforcement with Nap.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Polyethylene glycol/poly(butylene terephthalate) (PEG/PBT) block copolymers are utilized in various applications.
- Nano-apatite (Nap) is a potential filler for composite materials.
- Understanding filler-matrix interactions is crucial for composite performance.
Purpose of the Study:
- To investigate the effects of acicular nano-apatite (Nap) filler on the properties of PEG/PBT block copolymer composites.
- To evaluate the influence of poly(acrylic acid) (PAA) coating on Nap filler.
- To assess the mechanical properties and calcification behavior of the resulting composites.
Main Methods:
- Hydrothermal synthesis of acicular nano-apatite (Nap).
- Fabrication of Nap/Polyactive 70:30 (PEG/PBT) composites.
- Characterization of mechanical properties (Young's modulus) and physiochemical characteristics (swelling degree, calcification).
Main Results:
- Nap promoted calcification in Polyactive 70:30 composites.
- PAA coating on Nap adversely affected calcification, likely due to PAA-PEG complex formation.
- Nap exhibited a significant stiffening effect in dry conditions but a poor effect in aqueous environments.
- PAA coating had minimal impact on the mechanical properties of the composites.
Conclusions:
- Nano-apatite shows potential for enhancing polymer calcification.
- The hygroscopic nature and aggregation of Nap limit its reinforcing effect in aqueous environments.
- Homogeneous dispersion and surface modification of Nap are necessary for effective polymer reinforcement.