Enhancement of molecular weight of L-lactic acid polycondensates under vacuum in solid state

Kucharczyk, Pavel; Sedlařík, Vladimír; Junkar, Ita; Kreuh, Darij; Sáha, Petr

dc.title	Enhancement of molecular weight of L-lactic acid polycondensates under vacuum in solid state	en
dc.contributor.author	Kucharczyk, Pavel
dc.contributor.author	Sedlařík, Vladimír
dc.contributor.author	Junkar, Ita
dc.contributor.author	Kreuh, Darij
dc.contributor.author	Sáha, Petr
dc.relation.ispartof	Materiali in Tehnologije
dc.identifier.issn	1580-2949 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued	2012
utb.relation.volume	46
utb.relation.issue	1
dc.citation.spage	37
dc.citation.epage	41
dc.type	article
dc.language.iso	en
dc.publisher	Institut za Kovinske Materiale in Tehnologije Ljubljana	sl
dc.relation.uri	http://mit.imt.si/mit121.html
dc.relation.uri	http://mit.imt.si/izvodi/mit121/kucharczyk.pdf
dc.subject	poly(lactic acid)	en
dc.subject	solid state postpolycondensation	en
dc.subject	molecular weight enhancement	en
dc.description.abstract	Enhancement of L-lactic acid polycondensates by involving of postpolycondensation reactions in solid state under vacuum and catalyzed by stannous 2-ethylhexanoate were studied in the presented work. The catalyst was used only in postpolycondensation step. An effect of the catalyst concentration and postpolycondensation reaction time on resulting properties of poly(lactic acid) was studied by gel permeation chromatography. Fourier transform infrared spectroscopy and differential scanning calorimetry. Results show significant enhancement of molecular weight in case of the systems containing 2 wt. % of the catalyst due to the postpolycondensation procedure (M-W similar to 91.0 kg/mol; i.e. 1655 % after 24 hours). However, further progress can be assumed with increasing reaction time. This enhancement of poly(lactic acid) molecular weight had a response corresponding to changes of both physico-chemical and thermal properties of the solid state postpolycondensation products.	en
utb.faculty	Faculty of Technology
utb.faculty	University Institute
dc.identifier.uri	http://hdl.handle.net/10563/1002763
utb.identifier.rivid	RIV/70883521:28110/12:43868024!RIV13-MSM-28110___
utb.identifier.rivid	RIV/70883521:28610/12:43868024!RIV13-MSM-28610___
utb.identifier.obdid	43868115
utb.identifier.scopus	2-s2.0-84860740748
utb.identifier.wok	000300600100007
utb.source	j-wok
dc.date.accessioned	2012-03-30T12:13:09Z
dc.date.available	2012-03-30T12:13:09Z
dc.rights.uri	http://mit.imt.si/
dc.rights.access	openAccess
utb.ou	Centre of Polymer Systems
utb.contributor.internalauthor	Kucharczyk, Pavel
utb.contributor.internalauthor	Sedlařík, Vladimír
utb.contributor.internalauthor	Sáha, Petr
utb.fulltext.affiliation	Pavel Kucharczyk1, Vladimír Sedlařík1, Ita Junkar2, Darij Kreuh3, Petr Sáha1 1 Centre of Polymer Systems, Polymer Centre, Tomas Bata University in Zlin, nam. T. G. Masaryka 5555, 760 01 Zlin, Czech Republic 2 Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia 3 Ekliptik d.o.o., Teslova 30, 1000 Ljubljana, Slovenia sedlarik@ft.utb.cz
utb.fulltext.dates	Prejem rokopisa – received: 2011-06-05 sprejem za objavo – accepted for publication: 2011-07-18
utb.fulltext.references	1 A. Gregorova, M. Hrabalova, R. Wimmer, J. Appl. Polym. Sci., 114 (2010) 5, 2616–2623 2 V. Sedlarik, A. Vesel, P. Kucharczyk, P. Urbanek, Mater. Tehnol., 45 (2011) 3, 209–212 3 I. Poljansek, M. Gricar, E. Zagar, M. Zigon, Macromolecular Symposia, 272 (2008), 75–80 4 V. Sedlarik, N. Saha, J. Sedlarikova, P. Saha, Macromolecular Symposia, 272 (2008), 100–103 5 M. Hrabalova, A. Gregorova, R. Wimmer, V. Sedlarik, M. Machovsky, N. Mundigler, J.Appl. Polym. Sci, 118 (2010) 3, 1534–1540 6 S. Jacobsen, P. H. Degee, H. G. Fritz, P. H. Dubois, R. Jerome, Polym Eng Sci, 39 (1999), 1311–1319 7 H. R. Kricheldorf, Chemosphere, 43 (2001), 49–54 8 T. Maharana, B. Mohanty, Y. S. Negi, Prog. Polym. Sci., 34 (2009), 99–124 9 R. Auras, B. Harte, S. Selke, Macromol. Biosci., 4 (2004), 835–864 10 I. Poljansek, P. Kucharczyk, V. Sedlarik, V. Kasparkova, A. Salakova, J. Drbohlav, Mater. Tehnol., 45 (2011) 3, 261–264 11 V. Sedlarik, P. Kucharczyk, V. Kasparkova, J. Drbohlav, A. Salakova, P. Saha, J. Appl. Polym. Sci., 116 (2010) 2, 1597–1602 12 P. Kucharczyk, I. Poljansek, V. Sedlarik, V. Kasparkova, A. Salakova, J. Drbohlav, U. Cvelbar, P. Saha, J. Appl. Polym. Sci. DOI: 10.1002/app.34260 13 K. M. D. Silvia, T. Tarverdi, R. Withnall, J. Silver, Plast. Rubber. Compos., 40 (2011) 1, 17–24 14 J. R. Campanelli, D. G. Cooper, M. R. Kamal, J. Appl. Polym. Sci., 48 (1993), 443–451 15 A. Vesel, M. Mozetic, A. Zalar, Vacuum, 82 (2007) 2, 248–251 16 N. Krstulovic, I. Labazan, S. Milosevic, U. Cvelbar, A. Vesel, M. Mozetic, J. Phys. D: Appl. Phys., 39 (2006) 17, 3799–3804 17 A. Vesel, Mater. Tehnol., 45 (2011) 2, 121–124 18 W. X. Zhang, Y. Z. Wang, Chinese. J. Polym. Sci., 26 (2008) 4, 425–432 19 H. Xu, M. Luo, M. Yu, C. Teng, S. Xie, J. Macromol. Sci. B, 45 (2006), 681–687 20 F. Achmad, K. Yamade, S. Quan, T. Kokugan, Chem. Eng. J., 151 (2009), 342–350 21 E. W. Fischer, H. J. Sterzer, G. Wegner, Colloid. Polym. Sci., 251, (1973), 980–990
utb.fulltext.sponsorship	This research was financially supported by the Ministry of Education, Youth and Sports of the Czech Republic (project No. 2B08071 and ME09072) and Operational Program Research and Development for Innovations co-funded by the European Regional Development Fund (ERDF, project No. CZ.1.05/2.1.00/03.0111).
utb.fulltext.projects	MSM 2B08071
utb.fulltext.projects	MSM ME09072
utb.fulltext.projects	CZ.1.05/2.1.00/03.0111