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Moisture-induced properties

Moisture-induced properties of supramolecular shape memory polymers containing pyridine... [Pg.196]

Moisture-induced properties of polymers 205 Table 8.1 TGA data of BIN-SMPU with various BINA contents... [Pg.205]

Tomohiro Y, Forbes RT, Peter Y, Yoshiaki K. The improved compaction properties of mannitol after a moisture-induced polymorphic transition. Int J Pharma 2003 258(1-2) 121 131. [Pg.152]

The moisture-solid interaction is an inevitable aspect of pharmaceutical development. Elucidation of moisture-induced physical alterations in amorphous pharmaceuticals is crucial, especially for ASD. Gravimetric measurement on the rate and extent of moisture gain (sorption) by or loss (desorption) from amorphous samples as a function of RH or as a function of time at a constant RH (isohumic condition) can provide a wealth of information of ASD. The key structural properties of ASD measureable by moisture sorption/desorption are drug-polymer interactions, moisture-induced glass transition, crystallization, hydrate formation/dehydration, etc. while that associated with particulate or bulk properties are hygroscopicity, diffusivity, pore size, surface area, etc. (Burnett et al. 2009). [Pg.447]

C. C. Sun, Mechanism of moisture induced variations in true density and compaction properties of micro crystalline cellulose. Int. J. Pharm. 346, 93-101 (2008). [Pg.418]

Abstract This chapter introduces the moisture-induced shape memory effect (SME) observed in supramolecular shape memory polymers, particularly shape memory polyurethane (SMPU), containing pyridine moieties. The moisture absorption of polyurethane networks containing pyridine moeties (PUPy) is discussed followed by an investigation into the effect of relative humidity (RH), temperature, BINA content and MDI-BDO content. The induence of moisture absorption on both the thermal properties and the dynamic mechanical properties of SMPUs is also described, along with the moisture-induced SME mechanism. [Pg.196]

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