PREPARATION AND CHARACTERIZATION OF PLGA/TiO&lt;SUB&gt;2&lt;/SUB&gt; NANO DRUG DELIBERY CARRIERS

张秀梅,; Cai, Jing; 杨亚楠,; 陈学思,; 谢续明,

doi:10.3724/sp.j.1105.2011.10154

Cited by 1 publication

(1 citation statement)

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“…Chen et al [ 21 ] reported the cross linking and chemical bonding mechanism of 3-aminopropyltrimethoxysilane (APTMS) and 3-isocyanatopropyltrimethoxysilane (IPTS) on nano-TiO 2 particle surfaces. Zhang et al [ 22 ] pretreated the nano-TiO 2 surface with 3-aminopropyltriethoxysilane (KH-550) to prepare poly(lactic-co-glycolic acid) (PLGA)/TiO 2 organic–inorganic hybrid materials, which have been widely used as a nanodrug sustained-release carrier. As a result, KH-550 expanded the use of nano-TiO 2 in this case.…”

Section: Introductionmentioning

confidence: 99%

Curing Behavior of UV-Initiated Surface-Modified Nano-TiO2/Epoxy Resin Prepolymers and the Properties of Cured Composites

Xia

Zhang

et al. 2023

Polymers

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Nano-titanium dioxides (nano-TiO2) surface modified with isopropyl tri(dioctylpyrophosphate) titanate (NDZ-201), a titanate coupling agent, and 3-glycidoxypropyltrimethoxysilane (KH-560), a silane coupling agent, were separately mixed with bisphenol A epoxy resin (DEGBA) prepolymer and then cured using a UV-normal temperature synergistic curing process. Then, the isothermal curing process of the system was investigated by differential scanning calorimetry (DSC). The relationship between the organization structures, mechanical properties, and heat resistance properties of the cured composites and material formulation was studied, and the DSC results showed that the addition of nano-TiO2 reduced the curing reaction rate constant k1 and increased the k2 of the prepolymer, while the activation energy of the curing reaction after UV irradiation Ea1 decreased, and the activation energy in the middle and later periods Ea2 increased. The characterization results of the composite material showed that nano-TiO2 as a scattering agent reduced the photoinitiation efficiency of UV light, and due to its obvious agglomeration tendency in the epoxy resin, the mechanical properties of the composite material were poor. The dispersibility of the coupling-agent-modified nano-TiO2 in the epoxy resin was greatly enhanced, and the mechanical and heat resistance properties of the composite material improved remarkably. The comparison results of the two coupling agents showed that NDZ-201 had better performance in increasing the impact strength by 6.8% (minimum value, the same below) and the maximum thermal decomposition rate temperature by 4.88 °C of the composite, while KH-560 improved the tensile strength by 7.3% and the glass transition temperature (Tg) by 3.34 °C of the composite.

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Section: Introductionmentioning

confidence: 99%