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

Synthesis and self-assembly of biode...

Sun, Lu.

Linked to FindBook

Google Book

Amazon

博客來

Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends./
Author:	Sun, Lu.
Description:	262 p.
Notes:	Adviser: Lei Zhu.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3265807
ISBN:	9780549043980

Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends.
Sun, Lu.

Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends. - 262 p.

Adviser: Lei Zhu.

Thesis (Ph.D.)--University of Connecticut, 2007.

Polylactide (PLA), as an emerging biodegradable thermoplastic material derived from renewable resources, has attracted increasing research interest due to its biodegradability and biocompatibility. PLA containing block copolymers further diversify its application in the biomedical field, commodity materials, and even advanced nanoporous materials.

ISBN: 9780549043980Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends.
LDR:03440nam 2200289 a 45 001 957357
005 20110630
008 110630s2007 ||||||||||||||||| ||eng d
020 $a 9780549043980
035 $a (UMI)AAI3265807
035 $a AAI3265807
040 $a UMI $c UMI
100 1 $a Sun, Lu. $3 1280711
245 1 0 $a Synthesis and self-assembly of biodegradable polylactide containing block copolymers and their stereocomplex blends.
300 $a 262 p.
500 $a Adviser: Lei Zhu.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3086.
502 $a Thesis (Ph.D.)--University of Connecticut, 2007.
520 $a Polylactide (PLA), as an emerging biodegradable thermoplastic material derived from renewable resources, has attracted increasing research interest due to its biodegradability and biocompatibility. PLA containing block copolymers further diversify its application in the biomedical field, commodity materials, and even advanced nanoporous materials.
520 $a This thesis focuses on the fundamental aspects of morphology and phase behaviors of PLA-containing block copolymers, as well as their stereocomplex blends formed by blending incompatible enantiomeric PLA block copolymers. The work consists of two parts. First, using living ring-opening polymerization of L- and D-lactides (PLLA and PDLA), well-defined enantiomeric PLA block copolymers were synthesized from hydroxyl-terminated hydrophilic poly(ethylene oxide) (PEO) and hydrophobic poly(ethylene-co-1,2-butylene) (PEB) precursor polymers, respectively. Research effort was devoted to controlling the molecular weight of each block and narrow polydispersity. Quantitative stereocomplex formation was achieved by equimolar mixing of incompatible PEO- b-PLLA and PEB-b-PDLA.
520 $a Second, the morphology and phase behaviors of diblock copolymers and their stereocomplex blends were studied by small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) in both molten and crystalline states. In the stereocomplex systems, polymer brushes formed with PLLA/PDLA stereocomplex crystals as the substrate and PEO and PEB as the brushes. We were able to generate either balanced or unbalanced surface stresses on opposite sides of a stereocomplex crystal due to the crowded PEO and PEB brushes by changing the molecular weight of each block. When balanced surface stresses were generated, flat lamellar structure formed in both molten and crystalline states. Interestingly, if unbalanced surface stresses were generated, curved microstructures were found, and the detailed morphology depended on the molecular weights of PLLA/PDLA. A novel honeycomb structure with hexagonal cylinders being 2/3 of the volume fraction was achieved in the melt state when the PLLA/PDLA molecular weights were only 5,000 g/mol. Onion-like morphology was obtained in both the melt and crystalline states when the PLLA/PDLA molecular weights exceeded 10,000 g/mol. The detailed structures such as solid versus "hollow" onions were further controlled by the PLLA/PDLA molecular weights. Based on the SAXS and TEM results, tentative models were proposed to explain these novel structures.
590 $a School code: 0056.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 $a University of Connecticut. $3 1017435
773 0 $t Dissertation Abstracts International $g 68-05B.
790 $a 0056
790 1 0 $a Zhu, Lei, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3265807