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Clay-tethered thermoplastic polyuret...

Pattanayak, Asim.

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Clay-tethered thermoplastic polyurethane nanocomposites by bulk polymerization methods.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Clay-tethered thermoplastic polyurethane nanocomposites by bulk polymerization methods./
作者:	Pattanayak, Asim.
面頁冊數:	180 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2772.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3175337
ISBN:	9780542137334

Clay-tethered thermoplastic polyurethane nanocomposites by bulk polymerization methods.
Pattanayak, Asim.

Clay-tethered thermoplastic polyurethane nanocomposites by bulk polymerization methods. - 180 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2772.

Thesis (Ph.D.)--The University of Akron, 2005.

In this study, thermoplastic polyurethane nanocomposites of reactive silicate clays were synthesized by bulk polymerization methods and their thermal, rheological, and mechanical properties were evaluated and compared with those of non-reactive clays. The --OH groups contained in quaternary ammonium ions were used for clay-polymer tethering. Two methods were used for synthesis of nanocomposites. In Method I, the clay particles were allowed to react with prepolymer, followed by chain extension by butanediol with residual --NCO groups. In Method II, chain extended polyurethane polymer was mixed with organoclay particles. It was found that both clay-polymer reactions and shear stress of mixing are necessary for clay exfoliation. It was also found that hydrogen bonding did not contribute to clay exfoliation and to final mechanical properties. We found that nanocomposites were produced only in the case of reactive clays with Method II, which provided 110% increase in tensile modulus, 170% increase in tensile strength, 110% increase in tear strength, 120% increase in fracture toughness, and about 40% increase in abrasion resistance with 5wt% clay content. A separate study on kinetics of clay-polymer reactions revealed that these reactions are much slower than urethane reactions and therefore, longer times must be provided to generate enough clay-polymer tethering.

ISBN: 9780542137334Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Clay-tethered thermoplastic polyurethane nanocomposites by bulk polymerization methods.
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520 $a In this study, thermoplastic polyurethane nanocomposites of reactive silicate clays were synthesized by bulk polymerization methods and their thermal, rheological, and mechanical properties were evaluated and compared with those of non-reactive clays. The --OH groups contained in quaternary ammonium ions were used for clay-polymer tethering. Two methods were used for synthesis of nanocomposites. In Method I, the clay particles were allowed to react with prepolymer, followed by chain extension by butanediol with residual --NCO groups. In Method II, chain extended polyurethane polymer was mixed with organoclay particles. It was found that both clay-polymer reactions and shear stress of mixing are necessary for clay exfoliation. It was also found that hydrogen bonding did not contribute to clay exfoliation and to final mechanical properties. We found that nanocomposites were produced only in the case of reactive clays with Method II, which provided 110% increase in tensile modulus, 170% increase in tensile strength, 110% increase in tear strength, 120% increase in fracture toughness, and about 40% increase in abrasion resistance with 5wt% clay content. A separate study on kinetics of clay-polymer reactions revealed that these reactions are much slower than urethane reactions and therefore, longer times must be provided to generate enough clay-polymer tethering.
520 $a Composites prepared by Method I, with --NCO to --OH molar ratio of 1.0 failed to produce good nanocomposites due to appreciable reactions of --NCO groups with moisture present in clay. It was found that with excess --NCO, e.g., with --NCO : --OH ratio of 1.1, 60% increase in tensile strength and 50% increase in strain at break with 5 wt% clay can be obtained.
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