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New Findings Reported from University of Minnesota Describe Advances in Macromolecule Research (Polylactide Vitrimers)

August 22, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Macromolecule Research. According to news originating from Minneapolis, Minnesota, by NewsRx correspondents, research stated, "While much research has been aimed at new approaches to the healing of cross-linked polymers, there is a dearth of effort in the healing of renewable cross-linked polymers. In this study, the healing ability of renewable polylactide-based vitrimers containing Sn(Oct)(2) was investigated."

Our news journalists obtained a quote from the research from the University of Minnesota, "The vitrimers were prepared from hydroxyl-terminated star-shaped poly((+/-)-lactide) samples that were cross-linked with methylenediphenyl diisocyanate. Cross-linked samples were prepared with isocyanate:hydroxyl (IC:OH) ratios of 0.6:1 to 1.1:1 and initial catalyst:hydroxyl (Sn(Oct)(2):OH) ratios ranging from 0.013:1 to 0.050:1. The plateau modulus and T-g values for the cross-linked samples decreased with decreasing IC:OH ratio."

According to the news editors, the research concluded: "The materials were subjected to stress relaxation analyses, which confirmed that the materials not only were vitrimeric in nature but also exhibited remarkably short characteristic relaxation times of less than 50 s at 140 degrees C. Finally, vitrimers fractured in uniaxial tensile testing were healed by compression molding and exhibited up to 67% recovery of ultimate elongation, up to 102% recovery of tensile strength, and up to 133% recovery of tensile modulus values."

For more information on this research see: Polylactide Vitrimers. ACS Macro Letters, 2014;3(7):607-610. ACS Macro Letters can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; ACS Macro Letters -

The news correspondents report that additional information may be obtained from J.P. Brutman, University of Minnesota, Dept. of Chem, Minneapolis, MN 55455, United States. Additional authors for this research include P.A. Delgado and M.A. Hillmyer (see also Macromolecule Research).

Keywords for this news article include: Minnesota, Minneapolis, United States, Macromolecule Research, North and Central America

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Source: Science Letter

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