Documents disponibles écrits par cet auteur

Mechanical and morphological properties of chemically treated coir-filled polypropylene composites / Md. Nazrul Islam in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10491–10497 Titre : Mechanical and morphological properties of chemically treated coir-filled polypropylene composites Type de document : texte imprimé Auteurs : Md. Nazrul Islam, Auteur ; Md. Mominul Haque, Auteur ; Md. Monimul Huque, Auteur Année de publication : 2010 Article en page(s) : pp. 10491–10497 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mechanical--Morphological--Chemically  Treated--Coir-Filled--Polypropylene  Composites Résumé : In the present work, coir was chemically treated first with sodium perchlorate and then with 2,4-dinitrophenyl hydrazine (DNPH) to improve the mechanical properties of the coir−PP composites. Untreated, oxidized, and DNPH-treated coir samples at different mixing ratios were utilized to prepare the composites. Mechanical properties of the composites prepared from both perchlorate and DNPH-treated coir were found to be better than those of untreated ones. The tensile strengths of both untreated and treated coir−PP composites decreased with an increase in fiber content. However, the values were found to be higher than those of corresponding values of untreated ones. Treated coir−PP composites were found to absorb a lower amount of water than the untreated ones. To understand why the mechanical properties of composites prepared under different conditions of coir were different, surface morphologies of the tensile fractured surfaces of the specimens were recorded using scanning electron microscopy (SEM). The SEM images clearly revealed that there were fewer fiber agglomerations, microvoids, and fiber pull out traces in both perchorate and DNPH-treated coir−PP composite than in the untreated one, indicating that better distribution of the fiber into the matrix as well as stronger fiber matrix interfacial adhesion occurred upon treatment of coir. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900824c [article] Mechanical and morphological properties of chemically treated coir-filled polypropylene composites [texte imprimé] / Md. Nazrul Islam, Auteur ; Md. Mominul Haque, Auteur ; Md. Monimul Huque, Auteur . - 2010 . - pp. 10491–10497. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10491–10497 Mots-clés : Mechanical--Morphological--Chemically  Treated--Coir-Filled--Polypropylene  Composites Résumé : In the present work, coir was chemically treated first with sodium perchlorate and then with 2,4-dinitrophenyl hydrazine (DNPH) to improve the mechanical properties of the coir−PP composites. Untreated, oxidized, and DNPH-treated coir samples at different mixing ratios were utilized to prepare the composites. Mechanical properties of the composites prepared from both perchlorate and DNPH-treated coir were found to be better than those of untreated ones. The tensile strengths of both untreated and treated coir−PP composites decreased with an increase in fiber content. However, the values were found to be higher than those of corresponding values of untreated ones. Treated coir−PP composites were found to absorb a lower amount of water than the untreated ones. To understand why the mechanical properties of composites prepared under different conditions of coir were different, surface morphologies of the tensile fractured surfaces of the specimens were recorded using scanning electron microscopy (SEM). The SEM images clearly revealed that there were fewer fiber agglomerations, microvoids, and fiber pull out traces in both perchorate and DNPH-treated coir−PP composite than in the untreated one, indicating that better distribution of the fiber into the matrix as well as stronger fiber matrix interfacial adhesion occurred upon treatment of coir. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900824c

Mechanical properties of chemically treated sawdust - reinforced recycled polyethylene composites / Md. Nazrul Islam in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11124–11129 Titre : Mechanical properties of chemically treated sawdust - reinforced recycled polyethylene composites Type de document : texte imprimé Auteurs : Md. Nazrul Islam, Auteur ; Md. Sakinul Islam, Auteur Année de publication : 2011 Article en page(s) : pp. 11124–11129 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mechanical  properties  composites Résumé : In the present work, cetyltrimethylammonium bromide (CTAB)-treated sawdust-reinforced recycled polyethylene (RPE) composites were prepared by injection molding method. The mechanical properties of RPE composites reinforced with CTAB-treated sawdust were evaluated and the results were compared with those of untreated ones. The tensile strength (TS) values of the CTAB-treated composites were found to be much higher than those of the untreated ones. The Young’s modulus (YM), flexural strength (FS), flexural modulus (FM), and hardness values were also found to be improved for the treated sawdust–RPE composites compared to those of the untreated ones. The tensile fracture surface morphological features of treated sawdust–RPE composites observed by scanning electron microscopy (SEM) revealed less microvoids and fiber agglomerates, indicating that better fiber–matrix interfacial adhesion has occurred upon treatment of the sawdust with CTAB. Water absorption (%) values were found to increase with increases in fiber content in the composite. However, treated sawdust–RPE composites showed lower water uptake capacity compared to those prepared from untreated sawdust. From the IR spectra of raw and treated sawdust together with water absorption behavior of the composite specimens, it appeared that surface treatment with CTAB significantly reduced the hydrophilic nature of sawdust, resulting in improved fiber–matrix interfacial adhesion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201077k [article] Mechanical properties of chemically treated sawdust - reinforced recycled polyethylene composites [texte imprimé] / Md. Nazrul Islam, Auteur ; Md. Sakinul Islam, Auteur . - 2011 . - pp. 11124–11129. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11124–11129 Mots-clés : Mechanical  properties  composites Résumé : In the present work, cetyltrimethylammonium bromide (CTAB)-treated sawdust-reinforced recycled polyethylene (RPE) composites were prepared by injection molding method. The mechanical properties of RPE composites reinforced with CTAB-treated sawdust were evaluated and the results were compared with those of untreated ones. The tensile strength (TS) values of the CTAB-treated composites were found to be much higher than those of the untreated ones. The Young’s modulus (YM), flexural strength (FS), flexural modulus (FM), and hardness values were also found to be improved for the treated sawdust–RPE composites compared to those of the untreated ones. The tensile fracture surface morphological features of treated sawdust–RPE composites observed by scanning electron microscopy (SEM) revealed less microvoids and fiber agglomerates, indicating that better fiber–matrix interfacial adhesion has occurred upon treatment of the sawdust with CTAB. Water absorption (%) values were found to increase with increases in fiber content in the composite. However, treated sawdust–RPE composites showed lower water uptake capacity compared to those prepared from untreated sawdust. From the IR spectra of raw and treated sawdust together with water absorption behavior of the composite specimens, it appeared that surface treatment with CTAB significantly reduced the hydrophilic nature of sawdust, resulting in improved fiber–matrix interfacial adhesion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201077k