Tough polylactide graft copolymers

Grayce Theryo; Feng Jing; Louis M. Pitet; Marc A. Hillmyer

doi:10.1021/ma101155p

Tough polylactide graft copolymers

Grayce Theryo, Feng Jing, Louis M. Pitet, Marc A. Hillmyer

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

111 Scopus citations

Abstract

A simplified synthetic approach for the facile synthesis of polylactide graft copolymers utilizing both ring-opening metathesis polymerization (ROMP) and ring-opening transesterification polymerization (ROTEP) was reported. A comparison of the ¹H NMR signals from the poly(DL-lactide) (PLA) initiation sites along the poly(1,5-cyclooctadiene-co-5-norbornene-2-methanol) (PCN) backbone and the terminating end groups revealed a slight excess of the terminal methine proton suggesting the graft copolymer may contain a small portion of PLA homopolymer. The calculated number-average molecular weight (Mⁿ) of all the PLA chains in the system was 57 kg/mol. The size exclusion chromatography (SEC) data for the macroinitiator, PCN-332-10.9, showed a relatively symmetric, monomodal peak. Transmission electron microscopy (TEM) of thin sections of PCNL-332-10.9-95 revealed a phase-separated morphology consisting of spheroidal domains rich in poly-(1,5-cyclooctadiene) surrounded by a matrix of PLA.

Original language	English (US)
Pages (from-to)	7394-7397
Number of pages	4
Journal	Macromolecules
Volume	43
Issue number	18
DOIs	https://doi.org/10.1021/ma101155p
State	Published - Sep 28 2010

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title = "Tough polylactide graft copolymers",

abstract = "A simplified synthetic approach for the facile synthesis of polylactide graft copolymers utilizing both ring-opening metathesis polymerization (ROMP) and ring-opening transesterification polymerization (ROTEP) was reported. A comparison of the 1H NMR signals from the poly(DL-lactide) (PLA) initiation sites along the poly(1,5-cyclooctadiene-co-5-norbornene-2-methanol) (PCN) backbone and the terminating end groups revealed a slight excess of the terminal methine proton suggesting the graft copolymer may contain a small portion of PLA homopolymer. The calculated number-average molecular weight (Mn) of all the PLA chains in the system was 57 kg/mol. The size exclusion chromatography (SEC) data for the macroinitiator, PCN-332-10.9, showed a relatively symmetric, monomodal peak. Transmission electron microscopy (TEM) of thin sections of PCNL-332-10.9-95 revealed a phase-separated morphology consisting of spheroidal domains rich in poly-(1,5-cyclooctadiene) surrounded by a matrix of PLA.",

author = "Grayce Theryo and Feng Jing and Pitet, {Louis M.} and Hillmyer, {Marc A.}",

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T1 - Tough polylactide graft copolymers

AU - Theryo, Grayce

AU - Jing, Feng

AU - Pitet, Louis M.

AU - Hillmyer, Marc A.

PY - 2010/9/28

Y1 - 2010/9/28

N2 - A simplified synthetic approach for the facile synthesis of polylactide graft copolymers utilizing both ring-opening metathesis polymerization (ROMP) and ring-opening transesterification polymerization (ROTEP) was reported. A comparison of the 1H NMR signals from the poly(DL-lactide) (PLA) initiation sites along the poly(1,5-cyclooctadiene-co-5-norbornene-2-methanol) (PCN) backbone and the terminating end groups revealed a slight excess of the terminal methine proton suggesting the graft copolymer may contain a small portion of PLA homopolymer. The calculated number-average molecular weight (Mn) of all the PLA chains in the system was 57 kg/mol. The size exclusion chromatography (SEC) data for the macroinitiator, PCN-332-10.9, showed a relatively symmetric, monomodal peak. Transmission electron microscopy (TEM) of thin sections of PCNL-332-10.9-95 revealed a phase-separated morphology consisting of spheroidal domains rich in poly-(1,5-cyclooctadiene) surrounded by a matrix of PLA.

AB - A simplified synthetic approach for the facile synthesis of polylactide graft copolymers utilizing both ring-opening metathesis polymerization (ROMP) and ring-opening transesterification polymerization (ROTEP) was reported. A comparison of the 1H NMR signals from the poly(DL-lactide) (PLA) initiation sites along the poly(1,5-cyclooctadiene-co-5-norbornene-2-methanol) (PCN) backbone and the terminating end groups revealed a slight excess of the terminal methine proton suggesting the graft copolymer may contain a small portion of PLA homopolymer. The calculated number-average molecular weight (Mn) of all the PLA chains in the system was 57 kg/mol. The size exclusion chromatography (SEC) data for the macroinitiator, PCN-332-10.9, showed a relatively symmetric, monomodal peak. Transmission electron microscopy (TEM) of thin sections of PCNL-332-10.9-95 revealed a phase-separated morphology consisting of spheroidal domains rich in poly-(1,5-cyclooctadiene) surrounded by a matrix of PLA.

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JO - Macromolecules

JF - Macromolecules

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ER -

Tough polylactide graft copolymers

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