Temperature dependent swelling

Temperature dependent swelling behavior of the poly(AAm-BMA) gel consisting 10% BMA (Initial gel), PAAc gel (secondary gel) and IPNs composed of poly(AAm-co-BMA-10) with PAAc are shown in Fig. 11 and compared with a corresponding random copolymer gel. The IPNs and random gels show... 

Gosline, J. M. (1978). The temperature-dependent swelling of elastin. Biopolymers 17, 697-707. 

Hegewald J, Schmidt T, Eichhom KJ, Kretschmer K, Kuckling D, Arndt KF (2006) Electron beam irradiation of poly(vinyl methyl ether) films. 2. temperature-dependent swelling behavior. Langmuir 22(11) 5152—5159... 

Our group has demonstrated that the catalytic properties of immobilized enzymes can be manipulated by the temperature-dependent swelling behavior of the microgel. The hydrolytic activity of adsorbed and native P-D-glucosidase was determined as a function of temperature. Desorption of immobilized enzyme upon... 

The lower critical solution temperature (LCST) of the pure, weakly cross-linked PNIPAAm gel is 34°C determined by the swelling method (Shibayama et al. 1994). In order to increase the mechanical properties hydrogels with higher cross-linking densities can be prepared. In Fig. 2 the temperature-dependent swelling behaviour... 

In Fig. 3 the temperature-dependent swelling behaviour for PNIPAAm copolymer gels with different amounts of acidic comonomer (e.g. AAmPA 2 corresponds to 2 mol-% of AAmPA) is shown. In de-ionized (DI) water the comonomer is partly... 

P2VP side chains can be estimated from the NIPAAm/P2VP macromonomer ratio. The temperature-dependent swelling curves of the graft copolymers at different pH values are shown in Fig. 5. 

Fig. 2 Temperature-dependent swelling behaviour of PNIPAAm and poly(NiPAAm-co-DEG-MA) thin films immobilised by low-pressure argon plasma treatment (reproduced from (Nitschke et al. 2007a) with permission)...

Thermal sensitivity, based on temperature-dependent swelling as monitored using the EQCM, resulted from deposition in the presence of such polymers as 2-acrylamido-2-methyl-l -propane sulfonic add (AMPS) [148],... 

Preparation of thermoresponsive [141, 142] cryogels with entrapped oily emulsions, study of the temperature-dependent swelling behavior and emulsion release... 

Preparation of thermoresponsive [ 144] poly(iV//-diethylacrylamide) cryogels and study of their temperature-dependent swelling behavior... 

Phase separation temperature as detected by temperature-dependent swelling ratio measurement. 

The temperature-dependent swelling behavior of these hydrogels can be represented in a graph hy plotting a dimensional property of the hydrogel (e. g., the thickness or diameter of a hydrogel disc) as a function of the temperature stimulus. The resultant graph for poly-[N-isopropylacrylamide] is shown in Fig. 2. 

Figure 6.2 Temperature-dependent swelling behaviour in water of PNiPAAm and poly(NiPAAm-co-DEGMA) thin films.

Figure 6.7 Temperature-dependent swelling behaviour of electron beam-immobilised poly(vinyl methyl ether) thin films in water during heating and cooling.

Temperature/pH-dependent swelling behaviours of PVA-PAAc IPN (a) temperature-dependent swelling behaviour before equilibrium (6h) at 25X, (b) temperature-dependent swelling behaviour after equilbrium (24h) at 25X, (c) pH-dependent swelling behaviours at 25X ( ) IPN 46, ( ) IPN 55, (A) IPN 64. 

All the samples exhibited higher release rates at higher temperatures. These results are in correspondence with the temperature-dependent swelling behaviours of PVA/PAAc IPN hydrogels. All IPN samples showed positive temperature-sensitive systems before they reached the equilibrated state. The... 

A positively temperature-sensitive hydrogel is characterized by an UCST and these hydrogels contract upon cooling below the UCST Polymer networks consisting of poly(acrylic acid) (PAA) and polyacrylamide (PAAm) show such positive temperature-dependent swelling (Ward and Georgiou, 2011). 

The temperature-dependent swelling behavior of the pol mier layers can also be measured by optical microscopy. Spin-coated and photo cross-linked polymer films on a Si wafer are swollen in cold water, and then the layer thickness is observed while successively increasing the bath temperature. The swelling ratio at a certain temperature is determined by the ratio of the layer thickness in the swollen/collapsed state at that temperature and the thickness in the dry state [31]. 

For the investigation of the temperature dependent swelling behaviour of micropattemed features swollen gel dots were immersed in cold water and the bath temperature was increased while observing the gel dot dimensions from a 90° side view. The swelling ratio q is determined from the quotient of the dot thickness in the swollen state at a certain temperature and the thickness in foe dry state. The change of polymer chain conformation with temperature results in a... 

Figure 6 Temperature dependent swelling behaviour of gel dots of photopolymer A with different irradiation times ((A) 7 min, (O) 10 min, (O) 16 min) (28)...

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