181285

Poly(acrylic acid)

average M_v ~450,000

• Synonym(s): PAA
• Linear Formula: (C₃H₄O₂)_n
• CAS Number: 9003-01-4
• MDL number: MFCD00084394
• UNSPSC Code: 12162002
• PubChem Substance ID: 24850924
• NACRES: NA.23

Properties

• crosslinking: ~0.1 % cross-linked
• mol wt: average M_v ~450,000
• viscosity: 350-2500 cP
• transition temp: T_g 106 °C
• InChI: 1S/C3H4O2.Na/c1-2-3(4)5;/h2H,1H2,(H,4,5);/q;+1/p-1
• InChI key: NNMHYFLPFNGQFZ-UHFFFAOYSA-M

Description

General description

Poly (acrylic acid) (PAA) is hygroscopic, brittle and colorless in nature with T_g at nearly 106^oC. At temperatures above 200 to 250^oC, it loses water and becomes an insoluble crosslinked polymer anhydride. Solubility of dried PAA in water increases with rise in temperatures. Concentrated solutions of PAA in water is thixotropic in nature.

Application

Poly (acrylic acid) (PAA)/Poly methyl methacrylate copolymers are used for drug delivery.
Other applications may include:

• to study solute diffusion in Polyvinyl alcohol/PAA copolymer hydrogel
• synthesizing poly(N-isopropylacrylamide)-block-PAA copolymer which responds to both temperature and pH stimuli
• in preparing block copolymer of oligo (methyl methacrylate)/PAA for micellar delivery of hydrophobic drugs
• as thickening agent for adhesives.

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable