Aliphatic Polyester Thermoplastic Elastomers Containing Hydrogen-Bonding Ureidopyrimidinone Endgroups

Annabelle Watts, Marc A Hillmyer

Research output: Contribution to journalArticle

Abstract

Polylactide-block-poly(γ-methyl-ϵ-caprolactone)-block-polylactide (LML) is a sustainable thermoplastic elastomer (TPE) candidate that exhibits competitive mechanical properties as compared to traditional styrenic TPEs. The relatively low glass transition temperature of the polylactide endblocks, however, results in stress relaxation and low levels of elastic recovery. We report the synthesis and characterization of poly(γ-methyl-ϵ-caprolactone) (PMCL) and LML end-functionalized with ureidopyrimidinone (UPy) hydrogen-bonding moieties to improve the elastic performance of these polymers. Although UPy-functionalized PMCL shows dynamical mechanical behavior that is distinct from the unfunctionalized homopolymer, it does not exhibit elastomeric behavior at room temperature. The addition of UPy endgroups to LML increases the ultimate tensile strength, elongation at break, and tensile toughness compared to unfunctionalized LML. Stress relaxation studies at a fixed strain show reduced levels of stress relaxation in LML with UPy endgroups. The stress relaxation was further reduced by including semicrystalline poly((S,S)-lactide) as endblocks with UPy endgroups.

Original languageEnglish (US)
Pages (from-to)2598-2609
Number of pages12
JournalBiomacromolecules
Volume20
Issue number7
DOIs
StatePublished - Jul 8 2019

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Thermoplastic elastomers
Polyesters
Stress relaxation
Hydrogen bonds
Homopolymerization
Toughness
Elongation
Polymers
Tensile strength
Recovery
Mechanical properties
caprolactone
poly(lactide)
Temperature

PubMed: MeSH publication types

  • Journal Article

Cite this

Aliphatic Polyester Thermoplastic Elastomers Containing Hydrogen-Bonding Ureidopyrimidinone Endgroups. / Watts, Annabelle; Hillmyer, Marc A.

In: Biomacromolecules, Vol. 20, No. 7, 08.07.2019, p. 2598-2609.

Research output: Contribution to journalArticle

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