Chemical and nanomechanical analysis of rice husk modified by ATRP-grafted oligomer

Morsi, Samir M. M.; Pakzad, Anahita; Amin, Amal; Yassar, Reza S.; Heiden, Patricia A.

doi:10.1016/j.jcis.2011.04.065

Cited by 25 publications

(13 citation statements)

References 39 publications

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“…The combined presence of lignin and silica in the porous structure of rice hulls shows potential for example for the decontamination of environmental objects [ 3 ], while on the other hand providing significant interest in terms of offering an increased hardness and tear strength to a polymer matrix [ 4 ]. It is worth considering though that an increase of properties by the introduction of rice husk in materials is generally obtained through the extensive use of modifications, such as grafting [ 5 ] or application of foaming agents [ 6 ]. A work on poly(methyl methacrylate) with rice husk reported the application of a treatment with triphenylphosphine [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Sabbatini

Lanari²,

Santulli

et al. 2017

Materials

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In recent years, wood fibres have often been applied as the reinforcement of thermoplastic materials, such as polypropylene, whereas their use in combination with thermosetting resin has been less widespread. This study concerns the production of PMMA-based composites by partly replacing alumina trihydrate (ATH) with wood waste fillers, namely rice husks and almond shells, which would otherwise be disposed by incineration. The amount of filler introduced was limited to 10% as regards rice husks and 10 or 15% almond shells, since indications provided by reactivity tests and viscosity measurements did not suggest the feasibility of total replacement of ATH. As a matter of fact, the introduction of these contents of wood waste filler in PMMA-based composite did not result in any significant deterioration of its mechanical properties (Charpy impact, Rockwell M hardness and flexural performance). Some reduction of these properties was only observed in the case of introduction of 15% almond shells. A further issue concerned the yellowing of the organic filler under exposure to UV light. On the other hand, a very limited amount of water was absorbed, never exceeding values around 0.6%, despite the significant porosity revealed by the filler’s microscopic evaluation. These results are particularly interesting in view of the application envisaged for these composites, i.e., wood replacement boards.

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Section: Introductionmentioning

confidence: 99%

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Sabbatini

Lanari²,

Santulli

et al. 2017

Materials

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“…Возобновляемое сырье растительного происхождения является доступным и достаточно дешевым источником для производства ингредиентов и эластомерных композиций. Широко распространенным натуральным растительным сырьем для производства аморфного кремнезема является рисовая шелуха (РШ) и рисовая лузга [5,6] -органические отходы, которые производятся в больших количествах. РШ -основной побочный продукт производства риса, который представляет собой волокна на основе целлюлозы и содержит приблизительно 20% кремнезема [7,8].…”

Section: óãëåðîä-êðåìíèñòûé íàïîëíèòåëü äëÿ ýëàñòîìåðíûõ êîìïîçèöèéunclassified

Углерод-Кремнистый Наполнитель Для Эластомерных Композиций

Боброва¹,

Прокопчук²,

Ефремов³

et al. 2022

ТРУДЫ БГТУ Серия 2

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Белорусский государственный технологический университет 2 Казахский национальный университет имени аль-Фараби УГЛЕРОД-КРЕМНИСТЫЙ НАПОЛНИТЕЛЬ ДЛЯ ЭЛАСТОМЕРНЫХ КОМПОЗИЦИЙРазработка полимерных композиционных материалов с использованием различных экологически чистых наполнителей является областью активных исследований. Основная цель данной работы заключается в изучении структуры и химического состава углерод-кремнистого композита (УКК), полученного путем карбонизации смеси рисовой шелухи и рисового стебля в пиролизной печи без доступа кислорода, при температуре 550-600°С, до и после механоактивации. Химический состав УКК определен методом рентгенофазового анализа. Установлено, что композит состоит из углерода (35,0-60,0 ± 2,0%), диоксида кремния (30,0-50,0 ± 2,0%) и примесей оксидов металлов различной природы, а также содержит аморфную фракцию оксида кремния. Изучены основные физико-химические характеристики углерод-кремнистого композита. Методом сканирующей электронной микроскопии исследована структура композита. Выявленно, что она представляет собой в основном агрегаты со средним размером частиц 50,9 мкм, состоящие из слоистых образований с развитой внутренней системой пор. Определена площадь поверхности композита методом многоточечной адсорбции газов азота по методу БЭТ, которая составляет 36 м 2 /г. Осуществлена механоактивация УКК путем измельчения в вибрационной и планетарной мельницах при различном времени. Зафиксировано, что продолжительность механоактивации углеродкремнистого композита способствует увеличению удельной поверхности композита.

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“…For the sample of fiber initiator, the composition of Br 3d rose from 0% to 2.03%, and C 1s increased while O 1s decreased. The results showed that the 2-bromoisobutyryl groups were introduced onto the fiber surface and fiber initiator was formed through an ester bond from the hydroxyl groups on the surface of fiber (Morsi et al 2011).…”

Section: Surface Morphology and Chemical Composition Analysismentioning

confidence: 99%

Surface Grafting of Paper with Photochromic Spiropyran Ether Methacrylate

Tian¹,

Wang²,

Li³

et al. 2016

BioResources

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It was demonstrated that a photochromic paper could be made through the atom transfer radical polymerization (ATRP) method by grafting spiropyran ether methacrylate (SPMA) onto the fiber surface. The surface composition and topography of the grafted paper were analyzed by Fourier Transform Infrared Spectroscopy (FTIR), X-ray photoelectron spectra (XPS), and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS). Crystal structures of the cellulosic fibers were also examined after the grafting reaction. The characteristic absorption bands detected in the FTIR spectrum after grafting suggested that a new functional group was formed by the reaction. The XPS and SEM results confirmed that SPMA was grafted onto the surface of the fibers successfully. The grafted spiropyran groups exhibited reversible photochromic properties when exposed to UV light irradiation and visible light. The modified paper showed a purple color under UV light irradiation and changed back to its original color when exposed to visible light. This surface modification using ATRP was demonstrated to be a feasible way to prepare photochromic paper.

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Chemical and nanomechanical analysis of rice husk modified by ATRP-grafted oligomer

Cited by 25 publications

References 39 publications

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

Углерод-Кремнистый Наполнитель Для Эластомерных Композиций

Surface Grafting of Paper with Photochromic Spiropyran Ether Methacrylate

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