Poly 2- transmittance decrease

The phase transition temperatures (lower critical solution temperature, LCST) of the pol5miers were obtained from the change in the transmittance of their aqueous solutions (Figure 1). The aqueous solution of the obtained pol5uner was prepared and its transmittance at 500 nm was monitored with increase in the ambient temperature. Both of poly-NIPA and poly-NEA showed a sudden decrease in the transmittance at 37.5 and 69.2 °C, respectively. The result shown in Figure 1 clearly suggests the thermosensitivity of the pol5mers, and the obtained LCST values are close to those reported for poly-NIPA (34.8 °C) [8] and poly-NEA (72 °C) [9]. 

Figure 8 Transmittance of poly(methacryloyl sulfamethazine monomer-co-iV -dimethyl acrylamide) as pH values of the solution at decrease, (a) 20mol% sulfamethazine, (b) 30mol% sulfa-...

It would be of interest to add some functionalities such as properties in response to changes in pH, temperature, electrical potential and so on as well as hydrophilic properties to PTFE surfaces by the combined technique just described. Poly(AT-isopropylaoylamide) (PNIPA ) is a well-known thermo-responsive polymer whose hydrogel undergoes a volume change around 31 C in an aqueous solution. And further, poly 2-(dimethylamino)ethyl methacrylate (PDMA) in a pH 10 buffer solution exhibits a drastic decrease in the transmittance around 28 °C, which is considered to come from a phase transition of PDMA chains (ii). Therefore, we have tried to prepare JV -isopropylacrylamide (NIPAAm) or 2-(dimethylamino)ethyl... 

Studies of the photochemical behavior of polyamides based nanocomposites were run using MMT [116] or silica [10, 144]. As in other thermoplastics, MMT enhanced the photooxidative processes and accelerated the nanocomposite degradation [116]. In poly(trimethylhexamethylene terephthalamide)-silica nanocomposites, the silica enhanced the light transmittance and the effect decreased gradually when its amount increased over 5 wt% [144]. 

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