Thermally stable and solvent resistant honeycomb structured polystyrene films via photochemical cross-linking

Li, Lei; Zhong, Yawen; Li, Jian; Chen, Caikang; Zhang, Aijuan; Xu, Jinjun; Ma, Zhi

doi:10.1039/b911714h

Cited by 70 publications

(66 citation statements)

References 36 publications

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“…That is, the change of spectra intensity in transmittance spectra lags behind that of reflectance spectra in 20 min (see Figure 3a and b). This difference can be attributed that photochemical cross-linking of PS mainly takes place on the PCs surface, [21] which affects more reflectance spectra than transmittance spectra. [23] In our case, the optimized UV irradiation time is 20 min for the PC films with good optical properties and mechanical stability.…”

Section: Characterizationmentioning

confidence: 99%

“…It has been reported that PS could be effectively cross-linked under deep UV irradiation under certain conditions. [20,21] The process includes cross-linking, chain scission and oxidation, as shown in Scheme 1. After UV irradiation, the free radicals can form due to the removal of hydrogen atoms from polymer molecules, and the cross-linking may occur when two active points are close to each other.…”

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Tough and Hydrophilic Photonic Crystals Obtained from Direct UV Irradiation

Zhang

Xin

Zhou

et al. 2010

Macromol. Rapid Commun.

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Tough and hydrophilic polystyrene (PS) photonic crystals (PCs) were obtained from direct UV irradiation. The irradiation procedure results in photochemical cross-linking of PS spheres, which leads to the enhanced mechanical strength of the PC films, without degrading the spectra quality of the PCs. Otherwise, the irradiation induces the formation of the carbonyl groups upon the latex surface, which changes the wettability of the films from hydrophobicity to high hydrophilicity. The results provide a facile and effective approach to fabricate functional PC films with high mechanical strength and special wettability, which will be of great importance for the practical application of PCs.

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Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Tough and Hydrophilic Photonic Crystals Obtained from Direct UV Irradiation

Zhang

Xin

Zhou

et al. 2010

Macromol. Rapid Commun.

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show abstract

“…These results report low efficiency of energy transfer and linear relation between perylene fluorescence sensitization with its amount loaded in the film. The preparation of nanoporous PS films by 'breath figures' was reported in literature due to the condensation of water droplets caused by endothermic evaporation of the solvent from the film under a humid atmosphere [15]. It was assumed that pyrene and perylene can be assembled into the pores of PS film prepared from solution containing appropriate amounts of these components in humid atmosphere.…”

mentioning

confidence: 99%

Fluorescence enhancement effect in pyrene and perylene doped nanoporous polystyrene films: Mechanistic and morphology

Desai

Gupta

Kolekar

et al. 2013

Physica Status Solidi (a)

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Luminescent porous polystyrene (PS) films containing pyrene and various amounts of perylene were prepared in humid atmosphere by solution casting technique for use as a plastic scintillator. The fluorescence spectra of doped PS films monitored at pyrene excitation show quenching of monomer fluorescence of pyrene with simultaneous sensitization of perylene monomer fluorescence appearing towards red. The observed enhancement in fluorescence of perylene was explained by considering excitation energy transfer (EET) from pyrene to perylene molecules accommodated in the pores generated during film formation. The fluorescence quenching data do not fit into the Stern–Volmer relation, but the sensitized fluorescence is fitted by an exponential growth equation, y = 201 860 433.29 ex/0.64366 + 0.49262, with correlation coefficient R2 = 0.997. The results on absorption and excitation spectroscopy indicated that the pyrene and perylene filled in pores of the PS films exist as isolated molecules. The porosity of the films was examined by atomic force microscopy (AFM) and scanning electron microscopy (SEM), showing randomly oriented holes, and their mean size and size distribution were found to be depending upon the dopant concentration. Pyrene and perylene doped porous PS films prepared by solution casting method in humid atmosphere showed highly intense blue perylene fluorescence by fluorescence resonance energy transfer (FRET) at pyrene excitation. The SEM and AFM images revealed that nanosized pores are perylene concentration dependent, both pyrene and perylene held in the cavity of the pores in close proximal distance less than 10 nm is required to cause efficient energy transfer between them.

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“…188 Li et al also fabricated honeycomb structured films from PS-block-polyacrylic acid (PS-b-PAA) amphiphilic diblock copolymer at saturated humidity in a vessel at room temperature. They cross-linked both PS and PAA parts efficiently by applying simple UV irradiation.…”

mentioning

confidence: 99%

Droplet condensation on polymer surfaces: A review

UÇAR¹

2013

Turk J Chem

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A novel root inclusion net method was designed to determine the fine root productions and turnover rates of 13-, 22-, and 38-year-old Larix principis-rupprechtii plantations in the whole growing season of 2012, and it was compared with the results of the sequential coring method and in-growth core method. All following values are reported in order for 13-, 22-, and 38-year-old L. principis-rupprechtii plantations. The mean values of fine root biomasses were 103, 261, and 356 g m -2 , about 76-78% of which were live fine root biomasses. The fine root productions were 86-118 g m -2 year -1 , 124-138 g m -2 year -1 , and 134-160 g m -2 year -1 , respectively. The fine root turnover rates were 1.12, 0.61, and 0.51 times year -1 , respectively, suggesting a relative slow fine root turnover in L. principisrupprechtii plantations. The carbon inputs into soil accompanying fine root turnover were 52, 58, and 94 g C m -2 year -1 . This organic carbon is a sizeable pool in the forest ecosystem. The results suggest that our new modified root inclusion net method is suitable for field-based assessment of fine root production and turnover.

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Thermally stable and solvent resistant honeycomb structured polystyrene films via photochemical cross-linking

Cited by 70 publications

References 36 publications

Tough and Hydrophilic Photonic Crystals Obtained from Direct UV Irradiation

Tough and Hydrophilic Photonic Crystals Obtained from Direct UV Irradiation

Fluorescence enhancement effect in pyrene and perylene doped nanoporous polystyrene films: Mechanistic and morphology

Droplet condensation on polymer surfaces: A review

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