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Aluminum- and calcium-incorporated MCM-41-type silica as supports for the immobilization of titanium(IV) isopropoxide in ring-opening polymerization of l-lactide and ε-caprolactone

Paper ID Volume ID Publish Year Pages File Format Full-Text
49753 46764 2014 6 PDF Available
Title
Aluminum- and calcium-incorporated MCM-41-type silica as supports for the immobilization of titanium(IV) isopropoxide in ring-opening polymerization of l-lactide and ε-caprolactone
Abstract

•Ti-grafted Al- and Ca-incorporated MCM-41 catalysts were prepared for ROP.•The prepared catalysts better controlled ROP of l-lactide compared to Ti(OiPr)4.•The incorporation of Al or Ca in MCM-41 framework improved Mw of the polymers.•Al-MCM-41 support was more favorable than Ca-MCM-41 for ROP reactions.

Aluminum- and calcium-incorporated MCM-41-type silica with various Al/Si and Ca/Si ratios were evaluated as catalytic supports for ring-opening polymerization (ROP) of l-lactide and ε-caprolactone. The catalytic centers were generated by grafting titanium(IV) isopropoxide onto the support. All prepared heterogeneous catalysts better restrained the ROP of lactide than the homogeneous analog, titanium(IV) isopropoxide. Compared to siliceous MCM-41, the incorporation of aluminum or calcium in MCM-41 framework improved the molecular weight of the polymers although it lessened the polymerization rate. The more acidic Al-MCM-41 support appeared to be more favorable than the more basic Ca-MCM-41 support for the ROP reactions.

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Keywords
MCM-41; Ring-opening polymerization; Lactide; ε-Caprolactone; Mesoporous silica; Titanium alkoxide catalyst
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Aluminum- and calcium-incorporated MCM-41-type silica as supports for the immobilization of titanium(IV) isopropoxide in ring-opening polymerization of l-lactide and ε-caprolactone
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 45, 5 February 2014, Pages 118–123
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us