Efekat sadržaja umreživača na svojstva bubrenja inteligentnih gelova

Autor: Snežana Ilić-Stojanović, D Slobodan Petrovic, B Ljubisa Nikolic, D Vesna Nikolic, S Aleksandar Zdravkovic, V Jakov Stamenkovic
Rok vydání: 2014
Předmět:
Zdroj: Savremene tehnologije
Savremene tehnologije (2014) 3(2):10-15
ISSN: 2217-9712
Popis: This paper presents the procedure for the synthesis of hydrogels based on N-isopropylacrylamide (NIPAM) and 2-hydroxypropyl methacrylate (HPMet) using dioxan as a solvent. Hydrogels were obtained by radical polymerization using different contents of ethylene glycol dimethacrylate as a cross-linker and benzoyl peroxide as the initiator. In the FTIR spectra of poly(N-isopropylacrylamide-co- 2-hydroxypropylmethacrylate) (p(NIPAM-HPMet)) xerogel, new absorption bands are present and there are no specific bands characteristic of a monomer NIPAM, which indicates that copolymerization was performed. SEM micrographs show porous surfaces of xerogels. The aim of this work was the investigation of the swelling behavior for all synthesized hydrogels with different cross-linker content at the temperature from 20 to 40°C. The sample of p(NIPAM-HPMet) with the lowest cross-linker content reached the highest swelling degree at 20°C (α=20.23). The degree of swelling decreased with increa-sing the cross-linker content and temperature, so the samples with highest cross-linker content at 40°C reached the swelling degree of 2.05. U radu je izvršena sinteza hidrogelova na bazi N-izopropilakrilamida (NIPAM) i 2-hidroksipropil metakrilata (HPMet), primenom dioksana kao rastvarača. Hidro­gelovi su dobijeni radikalskom polimerizacijom uz upotrebu različitog sadržaja etilenglikoldimetakrilata (EDGM) kao umreživača i benzoil peroksida kao inicijatora. U FTIR spektrima kserogelova poli(N-izopropilakrillamid-ko-2-hidrok­sipropil metakrilata) (p(NIPAM-HPMet)) prisutne su nove apsorpcione trake, a nisu prisutne pojedine trake karakteristične za monomere, što ukazuje na izvršenu kopolimerizaciju. SEM mikrografije pokazuju poroznu površinu ksero­gelova. Svojstva pri bubrenju svih sintetisanih hidrogelova praćena su na temperaturama od 20 do 40°C. Najveću sposobnost bubrenja pokazao je uzorak p(NIPAM-HPMet)-a sa najmanjim sadržajem umreživača na 20°C (α = 20,23). Sposobnost bubrenja opada pri povećanju sadržaja umreživača i temperature, tako da uzorci sa najvećim sadržajem umreživača (3 mol% EGDM-a) na 40°C dostižu stepen bubrenja od samo 2,05.
Databáze: OpenAIRE