Structure–property relationships of new polystyrene nanocomposites prepared from initiator-containing layered double hydroxides of zinc aluminum and magnesium aluminum

Manzi-Nshuti, Charles; Chen, Dan; Su, Shengpei; Wilkie, Charles A.

doi:10.1016/j.polymdegradstab.2009.03.021

Cited by 45 publications

(33 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Basicamente este fato se deve à interação entre o polímero e as lamelas do HDL, onde temos monolamelas com dimensões nanométricas criando uma grande área superficial de contato entre HDL e poliestireno, o que acarreta a formação de ligações mais fortes e em maior número, possibilitando que ocorra um completo sinergismo entre matriz e reforço. Com esta interação entre reforço e matriz, este material apresenta uma maior resistência à difusão de oxigênio e compostos voláteis, outro fato de extrema importância para degradação mais lenta [16][17][18][19] . Na análise de TGA para os nanocompósitos é possível verificar um primeiro passo de degradação com valores de 130 a 220 °C, principalmente nos nanocompósitos com 3 e 5% de HDL, os com 0,5 e 1% essa degradação é muito sutil.…”

Section: Análise De Metunclassified

Síntese e caracterização de Nanocompósitos Esfoliados de Poliestireno: Hidróxido Duplo Lamelar via polimerização in situ

et al. 2011

View full text Add to dashboard Cite

Resumo: Nanocompósitos Esfoliados de Poliestireno (PS) e Hidróxido Duplo Lamelar (HDL) composto por zinco, alumínio e dodecil sulfato de sódio, como ânion interlamelar, foram sintetizados via polimerização in situ. O efeito de diferentes composições de HDL (0,5, 1, 3 e 5% em massa) foi avaliado. Os nanocompósitos obtidos foram caracterizados através de ensaios de Difração de Raios X (DRX), Espectroscopia no Infravermelho por Transformada de Fourier (FTIR), Microscopia Eletrônica de Transmissão (MET) e Análise Termogravimétrica (TGA). Os resultados obtidos através das análises de DRX e MET mostraram que todos os nanocompósitos produzidos apresentaram morfologia esfoliada. Os resultados das TGA, quando se utilizam 50% de perda de peso como ponto para comparação, apresentaram ganhos significativos de estabilidade térmica para todas as composições dos nanocompósitos em comparação ao poliestireno puro. Este comportamento possibilita uma vasta gama de aplicação destes novos materiais em diversos campos da indústria e pesquisa. Palavras-chave: Nanocompósito, hidróxido duplo lamelar, poliestireno, polimerização in situ. Synthesis and Characterization of Exfoliated Polystyrene-Layered Double Hydroxide Nanocomposites Via In Situ PolymerizationAbstract: Exfoliated nanocomposites of polystyrene (PS) and layered double hydroxide (LDH) compound of zinc, aluminium and sodium dodecyl sulfate, as interlayer anion, have been synthesized via in situ polymerization. The effect from the LDH compositions (0.5, 1, 3, 5% weight) was studied. The nanocomposites were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and Thermogravimetric Analysis (TGA). The XRD and TEM results showed an exfoliated morphology for the nanocomposites in all compositions. With the 50% weight loss taken as a reference, the TGA results indicated significant improvement in thermal stability for all compositions of the nanocomposites, in comparison to pure polystyrene. This is promising for the application of these new materials in many fields of industry and research. Keywords: Nanocomposite, layered double hydroxide, polystyrene, in situ polymerization. IntroduçãoOs nanocompósitos podem ser definidos como materiais híbridos em que pelo menos um dos componentes tem dimensões nanométricas [1][2][3] . Nanocompósitos poliméricos apresentam recente desenvolvimento e têm como marco inicial a publicação de um trabalho na década de 80/90 pelo grupo de pesquisa da empresa Toyota, onde foi produzido um nanocompósito de nylon 6 e o argilomineral (montimorilonita). O novo nanocompósito produzido apresentou uma extraordinária melhora nas suas propriedades mecânicas, térmicas e físicas quando comparado ao polímero puro [4] . Entre os nanocompósitos poliméricos, muitos estudos mostram como a dispersão de compostos lamelares em uma matriz polimérica afeta as propriedades do material obtido, no entanto, na maioria dos trabalhos são utilizados argilominerais trocadores catiônicos naturais, como a mon...

show abstract

Section: Análise De Metunclassified

Síntese e caracterização de Nanocompósitos Esfoliados de Poliestireno: Hidróxido Duplo Lamelar via polimerização in situ

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The reduction in PHRR is important for fire safety, as PHRR represents the point in a fire where heat is likely to propagate further, or ignite adjacent objects. [31] The HRR plots for pure PLA and its nanocomposites are shown in Fig. 7.…”

Section: Thermal Analysis (Dsc)mentioning

confidence: 99%

The influence of multiple modified MMT on the thermal and fire behavior of poly (lactic acid) nanocomposites

Zhou

Wen

et al. 2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

This work reported the preparation and physical properties of biodegradable nanocomposites fabricated using polylactic acid (PLA) and multiple organic modified montmorillonite (MMT). In order to improve the chemical compatibility between PLA and Na-MMT, the surface of Na-MMT was first organically modified by cetyl trimethyl ammonium bromide (CTAB) and resorcinol bis(diphenyl phosphate) (RDP) using ion-exchange and adsorption technique. Both Fourier transform infrared and X-ray diffraction (XRD) results indicated that CTAB and RDP molecules were intercalated into the galleries of MMT sheets to enlarge the interlayer spacing. Then, the PLA/MMT nanocomposites were prepared by a simple melt-blending method. The XRD and TEM results of the nanocomposites indicated that the PLA polymer chains inserted into the galleries of co-modified MMT (C-MMT) and contained disorderedly intercalated layered silicate layers within a PLA matrix. The C-MMT nanolayers were homogenously dispersed in PLA matrix, resulting in various property enhancement. The fabricated PLA/C-MMT nanocomposites with 5.0 wt% addition showed significant enhancements (176%) in the storage modulus compared to that of neat PLA. The thermal stability and fire resistance were also remarkably improved. These improvements are probably because of both the physical barrier effect of the MMT nanosheets and charring effect of the C-MMT.

show abstract

“…The shape of the TGA curve for the LDHs nanocomposites was very similar to that of the parent polymer, although T 0.1 and T 0.5 were slightly lower. This is probably due to the presence of LDH, which starts to decompose at a lower temperature [26,40]. The weight loss of the nanocomposites below 250 8C can be attributed to the loss of physical absorbed water (<150 8C) and interlayer water (150-250 8C) [19].…”

Section: Thermal Propertymentioning

confidence: 99%

“…In recent years, the intercalated or exfoliated polymer/LDH nanocomposites [17][18][19][20][21], especially PS/LDH nanocomposites [22][23][24][25][26] have attracted great interest in the field of material science due to their excellent thermal stability, flame retardancy, and physicochemical properties. Gao et al [9] reported the flame retardancy and rheological properties of high density polyethylene nanocomposites filled with different inorganic ions.…”

Section: Introductionmentioning

confidence: 99%

Preparation and flame retardancy of polystyrene nanocomposites based on layered double hydroxides

Han

Shen

et al. 2015

Polym. Compos.

View full text Add to dashboard Cite

Various layered double hydroxides (LDHs), including MgAl, CoAl, NiAl, and ZnAl-LDHs, were synthesized and modified using sodium dodecyl benzene sulfonate. Nonhalogen flame-retardant PS/LDHs nanocomposites were prepared via melt mixing method. The structure of PS/LDHs nanocomposites was investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) pattern technique, and scanning electronic microscope. Results from XRD indicated that intercalated/exfoliated structure was achieved in the polystyrene matrix. Dynamic mechanical thermal analysis suggested that the storage modulus and T g for the PS/LDHs nanocomposites was efficiently improved. Thermal and flammability properties of PS nanocomposites were investigated using thermogravimetry and cone calorimetry. Thermal analysis was evaluated and the prepared nanocomposites showed slightly lower thermal stability probably due to the presence of LDH, which starts to decompose at a lower temperature. Compared with neat PS, the peak heat release rate of PS/MgAl and PS/ZnAl-LDHs nanocomposites filled with 5 wt% LDHs is reduced by 7 and 12%, respectively. Among all LDHs, MgAl, and ZnAl-LDHs had a better smoke suppression effect with a reduction of peak smoke production rate and CO release rate of 37 and 44%, respectively. POLYM. COMPOS., 00:000-000, 2015.

show abstract

Structure–property relationships of new polystyrene nanocomposites prepared from initiator-containing layered double hydroxides of zinc aluminum and magnesium aluminum

Abstract: This paper is NOT THE PUBLISHED VERSION; but the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation below.

Cited by 45 publications

References 36 publications

Síntese e caracterização de Nanocompósitos Esfoliados de Poliestireno: Hidróxido Duplo Lamelar via polimerização in situ

Síntese e caracterização de Nanocompósitos Esfoliados de Poliestireno: Hidróxido Duplo Lamelar via polimerização in situ

The influence of multiple modified MMT on the thermal and fire behavior of poly (lactic acid) nanocomposites

Preparation and flame retardancy of polystyrene nanocomposites based on layered double hydroxides

Contact Info

Product

Resources

About