Preparation and characterization of nanohydroxyapatite-based nanocomposites derived from immiscible blends of thermoplastic polyurethane and polydimethylsiloxane rubber

Abstract

This article holds significance in preparing nanocomposites with reasonably good strength and flexibility. Nanohydroxyapatite (nHA) and polypropylene glycol-coated nHA (PPG-nHA) were synthesized by sol–gel technique. Nanocomposites derived from immiscible blends of thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) rubber with nHA as the nanofiller were prepared by melt mixing technique and characterized. Transmission electron microscopic images display a significant extent of dispersion of modified and unmodified nHA in the blend matrices. Scanning electron microscopy results show that the incorporation of PPG-nHA leads to a reduction in the particle size of PDMS in the blends. Dynamic storage modulus against strain sweep study reveals the interaction between the polymer matrix and the filler increased by the surface coating of nHA with PPG. Surface coating of nHA with PPG led to the enhancement of physicomechanical properties of the blend nanocomposites. Thermogravimetric analysis shows the incorporation of PPG-nHA increases the degradation temperature of TPU-PDMS blends. Melt rheological studies of the blends and the blend nanocomposites reveal the shear-thinning behavior of the nanocomposites at all different filler loadings, and this shear thinning effect is more prominent in the case of composites at higher loading of the nanofiller.

Derived from poplar leaves graphene-modified silicone rubber composites

“…Chemically and thermally stable silicone rubber (MVQ) 1,2 is widely used in various fields such as medical field, 3 advanced national defense technology, aerospace manufacturing, and fine chemical industry; 4 –7 because its mechanical strength is very low, it is difficult to meet the needs for industrial use. 8 Therefore, MVQ had to improve the wear resistance, fatigue resistance, strength, and other properties to meet the engineering requirements.…”

Unprecedented Strength Polysiloxane-Based Polyurethane for 3D Printing and Shape Memory

“…Polysiloxane materials with alternating Si–O bonds in the main chain possess many excellent properties, such as high- and low-temperature resistance, good flexibility, and biocompatibility . Thus, they are widely used in biomedical materials, such as vascular pumps, − breast prostheses, , heart valves, and artificial skin. , With regard to medical materials, different individuals have different size requirements. Fortunately, three-dimensional (3D) printing allows the production of many complex desired structures, which can be customized according to the needs of many people.…”

“…1 Thus, they are widely used in biomedical materials, 2 such as vascular pumps, 3−5 breast prostheses, 6,7 heart valves, 8 and artificial skin. 9,10 With regard to medical materials, different individuals have different size requirements. Fortunately, three-dimensional (3D) printing allows the production of many complex desired structures, which can be customized according to the needs of many people.…”

Mechanical Properties of Silicone Rubber / Hydroxyapatite Composite

“…The absence of double bond in the silicone rubber shown its flexible properties that contributes in easy processing and shaping for implantation [17]. Silicone rubber (SR) has been successfully contributes in biomedical application such as blood pump, cardiac pacemaker leads, mammary prostheses, artificial skin and maxillofacial reconstruction [6].…”