Effect of different structure MCM-41 fillers with PP-g-MA on mechanical and crystallization performances of polypropylene

Wang, Na; Gao, Na; Jiang, Sen; Fang, Qinghong; Er-fan, Chen

doi:10.1016/j.compositesb.2011.04.012

Cited by 31 publications

(17 citation statements)

References 18 publications

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“…Zhao et al (2008) reported that the Tg and thermal decomposition temperature of PMMA nanocomposite were enhanced by 23 and 93°C, respectively, in the presence of octavinyl-polyhedral oligomeric silseoquioxane (OV-POSS). In the study of Wang et al (2011), the addition of PMMA/MCM-41 filler and PPg-MA in PP nanocomposites showed better tensile and impact properties. Quintanilla et al (2006) prepared PP/ MMT nanocomposites with different grafting efficiency of PP-g-MA.…”

Section: Introductionmentioning

confidence: 99%

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

Kumar

Arun

Upadhyaya

et al. 2015

Int J Mech Mater Eng

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Section: Introductionmentioning

confidence: 99%

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

Kumar

Arun

Upadhyaya

et al. 2015

Int J Mech Mater Eng

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“…A widely used IFR system is a mixture of ammonium polyphosphate (APP), pentaerythritol (PER), and melamine (MEL). Synergism has been found between IFR and MCM-41 or SBA-15 in PP composites (PP-IFR) in our previous work [6]. Results show that mesoporous silica MCM-41 and SBA-15 exert the effective synergistic effect found in intumescent flame-retardant systems of PP to obtain good flame retardancy and satisfactory mechanical properties.…”

Section: Introductionmentioning

confidence: 49%

The influence of silicone shell on double-layered microcapsules in intumescent flame-retardant natural rubber composites

Wang

et al. 2014

J Therm Anal Calorim

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Double-shell co-microencapsulated ammonium polyphosphate and mesoporous MCM-41 (M(A&M)) were prepared by using melamine-formaldehyde resin and organic silicon in situ polymerization. The structure of the microcapsules was characterized by Fourier-transform infrared spectroscopy, particle size analysis, and scanning electron microscopy. In particular, the influence of basic properties of flame-retardant natural rubber , such as flameretardant and mechanical property, was investigated with the limiting oxygen index, UL-94 test, thermogravimetric analysis, tensile test, and rubber process analyzer (RPA). Due to the presence of organic silicone shell, the NR/ M(A&M) composites had much better flame-retardant and mechanical properties than other flame-retardant natural rubber (NR) composites. The limited oxygen index value of the NR/M(A&M) composite reached the maximum, and the UL-94 ratings were increased to V-0. Furthermore, M(A&M) showed better compatibility in NR system by the RPA. The occurrence of a synergistic effect between MCM-41 and intumescent flame-retardant in the NR composites was proved. As a result, the thermal stability and flame retardancy of NR were enhanced.

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“…There was not a significant change of the TGA curve at 350-700 C and the Fe 3 O 4 magnetic nanoparticles showed excellent thermally stability with approximately 95% residual mass. The pristine MCM-41 exhibited a weight loss at temperature up to 100 C and at above 150 C due to the release physically surface adsorbed water molecules and the condensation of the silanol groups, respectively [43]. TGA curve of Fe 3 O 4 @MCM-41-SH magnetic nanoparticles revealed two weight loss steps from room temperature to 700 C. The initial weight loss below 100 C is due to the loss of surface hydroxyls and water content in the nanoparticles.…”

Section: Tga Dta and Dsc Curvesmentioning

confidence: 98%

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Ulu

Noma

Köytepe

et al. 2018

Artificial Cells, Nanomedicine, and Biotechnology

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l-Asparaginase (l-ASNase) is a vital enzyme for medical treatment and food industry. Here, we assessed the use of FeO@Mobil Composition of Matter No. 41 (MCM-41) magnetic nanoparticles as carrier matrix for l-ASNase immobilization. In addition, surface of FeO@MCM-41 magnetic nanoparticles was functionalized with 3-mercaptopropyltrimethoxysilane (MPTMS) to enhance stability of l-ASNase. The chemical structure, thermal properties, magnetic profile and morphology of the thiol-functionalized FeO@MCM-41 magnetic nanoparticles were characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), differential scanning calorimetry (DSC), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray (EDX) spectroscopy and zeta-potential measurement. l-ASNase was covalently immobilized onto the thiol-functionalized FeO@MCM-41 magnetic nanoparticles. The properties of the immobilized enzyme, including optimum pH, temperature, kinetic parameters, thermal stability, reusability and storage stability were investigated and compared to free one. Immobilized enzyme was found to be stable over a wide range of pH and temperature range than free enzyme. The immobilized l-ASNase also showed higher thermal stability after 180 min incubation at 50 °C. The immobilized enzyme still retained 63% of its original activity after 16 times of reuse. The Km value for the immobilized enzyme was 1.15-fold lower than the free enzyme, which indicates increased affinity for the substrate. Additionally, the immobilized enzyme was active over 65% and 53% after 30 days of storage at 4 °C and room temperature (∼25 °C), respectively. Thereby, the results confirmed that thiol-functionalized FeO@MCM-41 magnetic nanoparticles had high efficiency for l-ASNase immobilization and improved stability of L-ASNase.

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Effect of different structure MCM-41 fillers with PP-g-MA on mechanical and crystallization performances of polypropylene

Cited by 31 publications

References 18 publications

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

The influence of silicone shell on double-layered microcapsules in intumescent flame-retardant natural rubber composites

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

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Effect of different structure MCM-41 fillers with PP-g-MA on mechanical and crystallization performances of polypropylene

Cited by 31 publications

References 18 publications

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

Properties of PMMA/clay nanocomposites prepared using various compatibilizers

The influence of silicone shell on double-layered microcapsules in intumescent flame-retardant natural rubber composites

Magnetic Fe3O4@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

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Product

Resources

About

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization