We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
The preparation and crystallization of long chain branching polylactide made by melt radicals reaction.
- Authors
You, Jinxiu; Lou, Lijuan; Yu, Wei; Zhou, Chixing
- Abstract
Long chain branching (LCB) of polylactic acid (PLA) was successfully prepared by melt radicals reaction with pentaerythritol triacrylate (PETA) and bis (1-methyl-1-phenylethyl) peroxide (DCP). The topological structure of the LCB was investigated by rheology and branch-on-branch (BOB) model was used to estimate the exact chain structures of the products, where comb-like LCB structures were generated due to the complex coupling between different macro-radicals. LCB structure was found to affect the crystallization of PLA products. In the temperature range of 110-130°C, the crystallization rate parameter ( k) was improved sharply and the half crystallization time was decreased significantly after the grafting of PETA, which was ascribed to the enhanced hydrogen bonding in PETA-grafted long chain branching PLA. By comparing with the LCB PLA made from chain extension using multifunctional monomer, it shows that the crystallization becomes slower in a highly branched material with extremely long relaxation time if the effect of hydrogen bonding is similar. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
- Subjects
CRYSTALLIZATION; POLYLACTIC acid; RADICALS (Chemistry); CHEMICAL reactions; PENTAERYTHRITOL; RHEOLOGY
- Publication
Journal of Applied Polymer Science, 2013, Vol 129, Issue 4, p1959
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.38912