20.500.12556/DKUM-52985 Influence of crosslinker and monomer ratio on bead size distribution, swelling and polymer network flexibility of 4-nitrophenylacrylate polymer supports Sphere shaped polymer supports with styrene and 4-nitrophenylacrylate as monomers and divinylbenzene (DVB) or ethyleneglycoldimethacrylate (EGDMA) as crosslinkers were prepared by free radical polymerization in suspension medium. Ratio of monomers as well as the crosslinking degree varied in order to test the influences on head size distribution, swelling and polymer network flexibility. The amount of crosslinker had an effect on bead size, average bead diameters being between 10 µm and 35 µm when 5% of crosslinker was applied and between 35 µm and 55 µm when 20% was used. The crosslinking degree also affected swelling in dichloromethane, water, methanol, toluene and acetonitrile, being more intense with lower concentrations of DVB or EGDMA. The flexibility of polymer networkwas investigated using reactions with 1,8-diaminooctane. High degrees of additional crosslinking was observed, namely between 58 and 95% indicating high flexibility of polymer network. Stirenske in 4-nitrofenilakrilatne nosilce zamrežene z divinilbenzenom ali etilen glikol dimetakrilatom smo pripravili s suspenzijsko polimerizacijo. Pri različnem razmerju monomerov in stopnji zamreženja smo analizirali porazdelitev velikosti delcev, nabrekanje v različnih topilih in fleksibilnost polimerne matrike. Ugotovili smo, da stopnja zamreženja vpliva tako na velikost delcev kot tudi na njihovo nabrekanje v različnih topilih. Povprečmi premer 5% zamreženih nosilcev je v intervalu med 10 in 35 µm, premer 20% zamreženih nosilcev pa v intervalu med 35 in 55 µm. 5% zamreženi nosilci nabrekajo bolj kot 20% zamreženi, kar velja za obe zamreževali. Fleksibilnost polimerne matrike smo določili z modelno reakcijo z 1,8-diaminooktanom. Visoka stopnja dodatnega zamreženja (48 do več kot 95%) kaže na fleksibilnost polimerne matrike. organic chemistry polymer supports 4-nitrophenilacrylate suspension polimerization bead size distribution organska kemija polimerni nosilci 4-nitrofenilakrilat emulzijska polimerizacija porazdelitev velikosti delcev true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-07-10 18:52:10 2015-07-10 18:52:10 2022-06-02 03:08:30 2021-05-10 03:31:48 2005 0 0 str. 215-223 št. 3 Letn. 52 2005 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1318-0207 547:678 14086149 9868566 1318-0207 URN:SI:UM:DK:0WNLLVLC Acta_Chimica_Slovenica_2005_Pulko,_Krajnc_Influence_of_crosslinker_and_monomer_ratio_on_bead_size_distribution,_swelling_and_polymer_net.pdf Acta_Chimica_Slovenica_2005_Pulko,_Krajnc_Influence_of_crosslinker_and_monomer_ratio_on_bead_size_distribution,_swelling_and_polymer_net.pdf 1 AE8510259E598C75753A5CBA815449B3 46413ad1f8c8e351b6ebe1d9bc5c8d43496b097d674da9e8eb593a095a494e0e 87cf774e-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=115528 http://acta-arhiv.chem-soc.si/52/52-3-215.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=77545 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0