R&D result detail

Original Title

Modification of Poly(Lactic Acid) by Radical Grafting for Application in Advanced Polymeric Materials

English Title

Modification of Poly(Lactic Acid) by Radical Grafting for Application in Advanced Polymeric Materials

Type

Paper in proceedings (conference paper)

Original Abstract

Post-reactor modification of poly(lactic acid) (PLA) was realized by free-radical grafting of PLA with itaconic anhydride (IAH) which are both derived from renewable resources. The reaction was initiated using 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (L-101). The influence of reaction conditions on IAH conversion, thermal properties and material structure was investigated. Hydrolytic scission of backbone or IAH homopolymerization was observed as undesired reactions. Evidence of grafted IAH and relation between reaction conversion and IAH/L-101 ratio were confirmed by acid-base titration, FTIR spectroscopy and NMR spectroscopy. Thermal properties and crystallization behavior of neat PLA and modified PLA (i.e, Tg, Xc) were determined as a function of monomer conversion by temperature modulated scanning calorimetry - TMDSC. Molecular weight and polydisperzity of grafted PLA samples were determined by GPC, contact angle was measured to predict adhesion properties. Modified PLA could be used in industrial application, especially by chemical compatibilization of grafted PLA with other polymers or fillers coatings. Such processes based on reactive extrusion could form polymer blends or composites with combined properties of both blended materials.

English abstract

Post-reactor modification of poly(lactic acid) (PLA) was realized by free-radical grafting of PLA with itaconic anhydride (IAH) which are both derived from renewable resources. The reaction was initiated using 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (L-101). The influence of reaction conditions on IAH conversion, thermal properties and material structure was investigated. Hydrolytic scission of backbone or IAH homopolymerization was observed as undesired reactions. Evidence of grafted IAH and relation between reaction conversion and IAH/L-101 ratio were confirmed by acid-base titration, FTIR spectroscopy and NMR spectroscopy. Thermal properties and crystallization behavior of neat PLA and modified PLA (i.e, Tg, Xc) were determined as a function of monomer conversion by temperature modulated scanning calorimetry - TMDSC. Molecular weight and polydisperzity of grafted PLA samples were determined by GPC, contact angle was measured to predict adhesion properties. Modified PLA could be used in industrial application, especially by chemical compatibilization of grafted PLA with other polymers or fillers coatings. Such processes based on reactive extrusion could form polymer blends or composites with combined properties of both blended materials.

Keywords

polylactic acid, reactive extrusion, grafting, itaconic anhydride

Key words in English

polylactic acid, reactive extrusion, grafting, itaconic anhydride

Authors

KUČERA, F.; PETRUŠ, J.

Released

07.04.2014

Publisher

AMCA spol. s r.o.

Location

Praha

ISBN

978-80-86238-61-6

Book

Proceeding of 2nd International Conference on Chemical Technology

Pages from

309

Pages to

315

Pages count

7

BibTex

@inproceedings{BUT107318,
  author="František {Kučera} and Josef {Petruš}",
  title="Modification of Poly(Lactic Acid) by Radical Grafting for Application in Advanced Polymeric Materials",
  booktitle="Proceeding of 2nd International Conference on Chemical Technology",
  year="2014",
  pages="309--315",
  publisher="AMCA spol. s r.o.",
  address="Praha",
  isbn="978-80-86238-61-6"
}