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Catalytic Synthesis of Bulk Hydrophilic Acetaldehyde-Modified Polyamide 46

Hamidreza Barghi (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Mikael Skrifvars ; Mohammad J. Taherzadeh
Current organic synthesis (1570-1794). Vol. 11 (2014), 2, p. 288-294.
[Artikel, refereegranskad vetenskaplig]

Hydrophilization of Polyamide 46 (PA46) via modification with acetaldehyde in continuous phase was studied. The chemical modification of PA 46 with acetaldehyde resulted in a water-swollen polymer with hydrophilic property. The polyamide 46 undergoes a nucleophilic addition with acetaldehyde in the presence of aluminum chloride as a catalyst. The extent of bulk hydroxyethylation using AlCl3 resulted in 95.65% modification counted as total N-hydroxyethylated polyamide 46. The modification resulted in improved hydrophilic properties, and a maximum surface free energy of 44.6 mJ/m2 was achieved after 3 h reaction, whereas the unmodified PA46 had a surface free energy of 11.2 mJ/m2. In addition, thermal properties of the polymers were studied using differential scanning calorimetry and thermogravimetric analyses. The functionalization leads to decrease in the crystallization energy from 88 J/g to 51 J/g, while the melting energy is changed from 110 J/g to 53 J/g. Furthermore, the thermal stability of the PA46 to pyrolysis was diminished after hydroxylation.

Nyckelord: Hydroxylation, Lewis acid, nucleophilic substitute reaction, polyamides, synthesis



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Denna post skapades 2014-01-13. Senast ändrad 2014-10-23.
CPL Pubid: 192219

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)

Ämnesområden

Materialvetenskap
Organisk syntes
Polymerkemi

Chalmers infrastruktur

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