Study Polyacrylates and Fluoropolymer and Perfluoroalkylacrylate Modified Polyacrylates.pdf

1、Due to the high electro-negative properties of fluorine atom (4.0), the short atom radius (0.132nm), the short C-F bond and the high bond energy, the fluorinated polymers are distinguished particularly by their high ther

2、mal, chemical and weather resistance, unique electrical properties, excellent surface properties (especially oil and water repellency) and optical properties,the results of many applications in such as building industrie

3、s (paintings and coatings), and treatment of textile. In this paper, the interaction between polyvinylidene fluoride(PVDF) and atatic-poly methyl methacrylate(at-PMMA),thereactivityratiosandQ,evaluesofperfluoroalkyl meth

4、acrylate(Zonyl<'R> TM), methyl methacrylate(MMA) and butyl acrylate(BA), and the core-shell emulsion polymerization of Zonyl('R) TM/MMA/BA have been studied and the results were shown as below: In chapter two, the intera

5、ction between PVDF and at-PMMA has been confirmed although such kind of force is weak. With the increment of PVDF weight fraction, the blends exhibit more heterogeneous properties and the films thus made appear to be mor

6、e opaque. The difference spectra after subtraction of PVDF and PMMA showed that the interaction between carbonyl groups of PMMA and the hydrogen atoms of PVDF as the shift of υ c=o band to a lower frequency with higher P

7、VDF content. The contact angle measurement demonstrated that the hydrophobicityagainst water increased with PVDF contents and that contact angles against water are larger than90° when PVDF contents exceed 30％ indicating

8、good water repellency. The contact anglesagainst n-hexane, however, cannot be measured because of the complete wetting of the film byn-hexane.In chapter three, the solution polymerization was adopted to determine the rea

9、ctivity ratiosand Q, e values of Zonyl<'R> TM, MMA and BA. From the results one can see that the reactivityratio of Zonyl<'R> TM(0.88) is not that larger than that of MMA(0.10)and the e value of Zonyl<'R> TM(0.76) is onl

10、y little higher than those of MMA(0.40) and BA(-0.165), which mean thatalthough the electronegativity of perfluoroalkyl side chain exerts a great influence on themonomer reactivity, the blocking of the OCH<,2>CH<,2> grou

11、p dramatically reduced such kind of effect.Therefore, it was assumed that in the solution polymerization MMA and Zonyl<'R> TM are good for copolymerization with copolymer composition almost the same as monomer feed which

12、 allows us to control the composition of copolymer by adjusting the monomer feed. However, in the emulsion polymerization of these two kinds of monomer the condition may not be as ideal as predicted because the high hydr

13、ophobicity of perfluoroalkyl group would probably induce the self-polymerization of Zonyl<'R> TM thus leading to coagulation. In chapter four, core-shell latex with polyacrylate rich in core and fluoropolymer rich in she

14、ll was synthesized by semicontinuous emulsion polymerization with SDS/DNS-86 served as surfactants(3~4wt％) and KPS as an initiator. The polymerization temperature was about 80℃and the solids content of latex was about 20

15、 wt％. The stability of the final latex particles was very good but the core-shell structure of latex particles can not be clearly seen. FTIR spectra of the latex clearly show the copolymerization of Zonyl<'R> TM with MMA

16、 and BA. DSC thermograms indicate that the core and the shell have different Tg s without sharp peaks representing the extinction of transition between the core and the shell phase. The contact angles against water and c

17、etane were all above 90° and about 50° respectively when Zonyl<'R> TM was copolymerized into latex. The results demonstrated that the core-shell latex film could only be wetted by water and cetane with difficulty when on

18、ly small amount of the fluoromonomer was used (2-6wt％ Zonyl<'R>TM). By preparing core-shell latex with fluoropolymer rich in the shell phase, we can efficiently modify the surface property of the film by using only small

19、 amounts of fluorinated monomers. At present, in the foreign countries, perfluoalkyl acrylates polymers have been successfullyapplied in the coatings for optical components, architecture coatings and the textile industry

20、. As inour country, however, the industrial production of perfluoroalkyl acrylates has not been achievedand the high price of importing perfluoroalkyl acrylates dramatically blocks the market, which isnow occupied by the

21、 classical fluoro-industry (PTEF, PVDF). The development of theperfluoroalkyl acrylates production and the related researches will bring the broader investigationof fluoro-polymers without doubt and accelerate their indu