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Synthesis of Cyclic and Linear Poly(...

Shaik, Muneer.

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Synthesis of Cyclic and Linear Poly(Hydroxybutyrates) by Ring-Opening Polymerization of beta-Butyrolactone with Amido-Oxazolinate Zinc Catalysts.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis of Cyclic and Linear Poly(Hydroxybutyrates) by Ring-Opening Polymerization of beta-Butyrolactone with Amido-Oxazolinate Zinc Catalysts./
作者:	Shaik, Muneer.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	76 p.
附註:	Source: Masters Abstracts International, Volume: 58-02.
Contained By:	Masters Abstracts International58-02(E).
標題:	Inorganic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10845075
ISBN:	9780438395664

Synthesis of Cyclic and Linear Poly(Hydroxybutyrates) by Ring-Opening Polymerization of beta-Butyrolactone with Amido-Oxazolinate Zinc Catalysts.
Shaik, Muneer.

Synthesis of Cyclic and Linear Poly(Hydroxybutyrates) by Ring-Opening Polymerization of beta-Butyrolactone with Amido-Oxazolinate Zinc Catalysts. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 76 p.

Source: Masters Abstracts International, Volume: 58-02.

Thesis (M.S.)--The University of North Dakota, 2018.

A series of amido-oxazolinate zinc complexes have been employed for the ring opening polymerization of beta-butyrolactone (BBL). Experimental results show that these complexes efficiently catalyze the reactions, yielding cyclic poly(hydroxybutyrate)s (PHBs) with high molecular weights (M n up to 196 kg/mol) and low dispersity. In contrast, in the presence of alcohol co-catalysts, the zinc-catalyzed ring-opening polymerization (ROP) reactions lead to the formation of linear PHBs end-capped by the alcohol initiator and hydroxylbutyrate. A possible mechanism for cyclic PHBs is proposed, in which the zinc catalysts function as a loose Lewis pair at elevated temperature, followed by a fast propagation through a zwitterionic intermediate. Use of diols such as 1,4-cyclohexane diol and 1,4-benzenedimethanol results in the formation of polyester diols. The thermal properties were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to differentiate between the cyclic and linear polyesters.

ISBN: 9780438395664Subjects--Topical Terms:

3173556
Inorganic chemistry.

Synthesis of Cyclic and Linear Poly(Hydroxybutyrates) by Ring-Opening Polymerization of beta-Butyrolactone with Amido-Oxazolinate Zinc Catalysts.
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