東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Melt compounding and characterizatio...

The University of Wisconsin - Madison.

Linked to FindBook

Google Book

Amazon

博客來

Melt compounding and characterizations of polymer alumina nanocomposites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Melt compounding and characterizations of polymer alumina nanocomposites./
Author:	Chandra, Alexander.
Description:	139 p.
Notes:	Advisers: Lih-Sheng Turng; Padma Gopalan.
Contained By:	Dissertation Abstracts International69-05B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314294
ISBN:	9780549633648

Melt compounding and characterizations of polymer alumina nanocomposites.
Chandra, Alexander.

Melt compounding and characterizations of polymer alumina nanocomposites. - 139 p.

Advisers: Lih-Sheng Turng; Padma Gopalan.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.

This study is intended to produce nanocomposites with well-dispersed spherical alumina nanoparticles that can be effectively compounded using existing and traditional mixing instruments, and to characterize their resultant mechanical, optical, and tribological properties.

ISBN: 9780549633648Subjects--Topical Terms:

783786
Engineering, Mechanical.

Melt compounding and characterizations of polymer alumina nanocomposites.
LDR:03586nmm 2200325 a 45 001 862816
005 20100721
008 100721s2008 ||||||||||||||||| ||eng d
020 $a 9780549633648
035 $a (UMI)AAI3314294
035 $a AAI3314294
040 $a UMI $c UMI
100 1 $a Chandra, Alexander. $3 1030674
245 1 0 $a Melt compounding and characterizations of polymer alumina nanocomposites.
300 $a 139 p.
500 $a Advisers: Lih-Sheng Turng; Padma Gopalan.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3225.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
520 $a This study is intended to produce nanocomposites with well-dispersed spherical alumina nanoparticles that can be effectively compounded using existing and traditional mixing instruments, and to characterize their resultant mechanical, optical, and tribological properties.
520 $a The first approach involved melt compounding of polystyrene and various titanium dioxide nanoparticles, surfactants, and mixing aggressiveness using a co-rotating twin screw extruder. However, the overall nanoparticle dispersion was found to be unsatisfactory, and the nanoparticles caused severe catalytic degradation on the host polystyrene. The second approach involved introducing a direct covalent bonding between the nanoparticles and host matrix through the solution method with the aid of a coupling agent and ultrasonic mixing. The material system used was alumina nanoparticles and the high molecular weight poly(styrene maleic anhydride). It was found that although good polymer-filler wetting and better nanoparticle dispersion were achieved, the coupling agent alone was not enough to prevent nanoparticle reagglomeration, resulting in a combination of nanoscaled dispersion and larger agglomerates.
520 $a The direct covalent bonding method was then modified to develop a novel approach to coat the nanoparticles with a thin layer of polymer. The polymer coating masked the van der Waals forces and introduced steric repulsive forces among the nanoparticles for easier dispersion. Chemical analyses were performed to confirm the resulting covalent bonding between the polymer coating and the nanoparticle surface. Excellent nanoparticle dispersion and modest light transmittance for specimens of 2 mm thick were effectively achieved through melt compounding using the high intensity thermokinetic mixer.
520 $a Among the various nanocomposites characterized and produced using the third method, it was found that polycarbonate alumina nanocomposites possess moderate light transmittance, which depends on the population and size of the nanoparticles, and the treatment method. Furthermore, the ductility of polycarbonate could be retained provided that the alumina size and population were small enough and the material was tested at slower deformation speed. In addition, the brittle impact fracture behavior of polycarbonate could be alleviated by the alumina nanoparticles through the creation of multilevel microcrazes that absorbed considerable fracture energy. Preliminary results also suggested that the polycarbonate/alumina nanocomposites, even at a low loading content, exhibited improved wear performance.
590 $a School code: 0262.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Plastics Technology. $3 1023683
690 $a 0548
690 $a 0795
710 2 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertation Abstracts International $g 69-05B.
790 $a 0262
790 1 0 $a Gopalan, Padma, $e advisor
790 1 0 $a Turng, Lih-Sheng, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314294