Regulation of Gemini Surfactant on Photochromic Behavior of PVA Dispersed Spiropyran Organogel Thin Film†

doi:10.7503/cjcu20170754

Abstract

Abstract:

Polyvinyl alcohol(PVA) dispersed spiropyran(SP) organogel thin film(PDPG-SP) was prepared by a facile co-solvent-evaporation strategy. 1,6-Didodecyl(dimethyl) azanium bromide hexamethylene used to regulate interface interaction between PVA/organogel was used as one sort of Gemini surfactant. The photochromic and fading behavior, microstructure morphology, mechanical properties and light fatigue resistance of PDPG-SP were investigated. The results show that the thermal decay behavior for PDPG-SP film is similar to that of SP/PPG solution. Interestingly, PDPG-SP also has excellent mechanical property with elastic modulus and tensile strength as high as ca. 547 and ca. 23.5 MPa respectively. After 10 repeated coloration-discoloration cycles, the intensity at the maximum absorption wavelength decreases by about 35%, which was decreased dramatically comparing with that using PVA1 as a surfactant(ca. 53%). Based on the separation force by head-end gathering process of Gemini, the anchor effect of PVA/organogel interface on SP is suppressed. Meanwhile, more SP molecules were protected within micro-solvent environment, which was homogeneously dispersed in PVA matrix. The anchor effect increases the number of SP molecules that could conduct reversible free isomerization, accelerating the fading rate and improving the fatigue resistance of the PDPG-SP thin film concurrently.

Key words: Photochromic, Spiropyran, Gemini surfactant, Polyvinyl alcohol, Fading rate, Fatigue resistance

CLC Number:

O631

TrendMD:

LONG Shijun,CHEN Mingmin,ZHAO Youjiao,WANG Xiaotao,LI Xuefeng,LIAO Yonggui. Regulation of Gemini Surfactant on Photochromic Behavior of PVA Dispersed Spiropyran Organogel Thin Film^†[J]. Chem. J. Chinese Universities, 2018, 39(5): 1078.

Figures/Tables 7

Scheme 1 Photochromic reactions of spiropyran

Fig.1 UV-Vis spectra of PDPG-SP film before(a) and after 1 min(b) of UV light irradiation(λmax=577 nm)(A) and time-dependent normalized absorbance at the maximum absorption wavelength(λmax) in PDPG-SP film from the first to the sixth thermal bleaching process(B) Note:Inset shows the fade kinetics illustrating the large fade-speed enhancement.

Table 1 Decoloring kinetic parameters of PDPG-SP film during thermal bleaching process

UV light irradiation times	A_∞	A₀	k
1	0.006	0.942	0.0418
2	0.0076	0.996	0.0398
3	0.01	0.972	0.0374
4	0.013	0.957	0.0373
5	0.009	0.866	0.0344
6	0.011	0.849	0.0322

Fig.2 SEM images for SP-PDPM film before(A) and after removal of SP and PPG by immersed in n-hexane for 24 h(B, C)

Scheme 2 Schematic diagram of PVA dispersed SP organogel

Fig.3 Changes of A(λ=577 nm) during repeated coloration-discoloration cycle of PDPG-SP film

Table 2 Mechanical properties of PVA, PVA-SP and PDPG-SP films

Sample	Elastic modulus/MPa	Tensile strength/MPa	Elongation at break(%)
PVA^[17]	1211±173	42.0±6.2	138±57
PVA-SP	685±109	30.1±2.1	179±41
PDPG-SP	547±104	23.5±2.1	202±45

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