Novel Zwitterionic Surfactants: Synthesis and Surface Active Properties of N-(3-Alkoxy-2-Hydroxypropyl)-N, N-Dimethyl glycine Betaines

Five new zwitterionic surfactants with long chain alkyl betaine structure incorporated with hydroxylpropyl group have been synthesized. Their structures were identified by elemental analysis, IR (HNMR)-H-1, and (CNMR)-C-13. Surface tension experiments showed that these surfactants have higher surface activity than those without hydroxypropyl group. The values of CMC and gamma(CMC) of these surfactants have been determined.

SYNIHESIS AND SURFACE ACTIVE PROPERTIES OF OXYETHYLENATED FATTY ALCOHOL 2-HYDROXYPROPYL SULFONATES

Synthesis and surface active properties of the oxyethylenated fatty alcohol 2-hydroxypropyl sulfonates were investigated.Of all surface active compounds studied,those with a 2-hydroxypropyl (HP) moiety in the molecule are more surface-active than the corresponding compounds without it.

Self-cleaning Property of Tencel Fabric by Air Plasma and Cross-Linking Treatment Based on TiO_2/SiO_2 Sol-Gel Method

The ionic cross-linking treatment with 3-chloro-2-hydroxypropyl trimethyl ammonium chloride( CHTAC) and 1,2,3,4-butanetetracarboxylic acid( BTCA) was treated on untreated and plasma treated Tencel fabrics,and then TiO_2/SiO_2 sol was applied to the treated samples. Self-cleaning characteristic was investigated using the color measurement spectrophotometer with 7 h UV irradiation. Moreover, the surface morphology, structure change of samples were observed by scanning electron microscopy( SEM) and Fourier transform infrared spectroscopy( FTIR),respectively. The results revealed that with the increase of CHTAC concentration, breaking strength of Tencel fabric increased,whiteness index decreased,and wrinkle recovery angle first dropped and then rose. It was also found that increasing concentration of BTCA,breaking strength of Tencel fabric decreased,whiteness index and wrinkle recovery angle increased. FTIR studies revealed that CHTAC and BTCA had grafted on Tencel fabric. Nevertheless,the molar ratio of 50∶1 of TiO_2/SiO_2 sol endowed Tencel fabric with better self-cleaning properties,compared with sample treated with pure TiO_2. Furthermore,compared with sample treated with TiO_2/SiO_2 sol alone, the combination of plasma and cross-linking treatment( plasma + CHTAC + BTCA + TiO_2/SiO_2) decreased the value of K/S,and increased the value of ΔE,ensured more efficient photodegradation of methylene blue, and thus got a better performance of self-cleaning.

Comb-like Poly(N-(2-hydroxypropyl) methacrylamide) Doxorubicin Conjugates: The Influence of Polymer Architecture and Composition on the Biological Properties

The synthesis and structure-property correlation of poly（N-（2-hydroxypropyl） methacrylamide） （PHPMA） conjugates with various architectures including random, block, branched or star-like structures and compositions have been thoroughly explored. However, related synthesis and structure-property data are still lacking for comb-like PHPMA. In this work, we report the synthesis of comb-like PHPMA copolymer-doxorubicin （DOX） conjugates with different backbone/side-chain lengths and location of drug moieties. Well-defined comb-like PHPMA-DOX conjugates are obtained via the combination of controlled radical polymerization and fractional precipitation techniques. The influences of structural factors on the biological properties such as cellular uptake, blood circulation and tumor accumulation have been investigated. Long blood circulation and efficient tumor accumulation can be achieved by proper control of the comb number, length and location of drug moieties. These facile comb-like structures possess great potentials in future theranostics for brachytherapy or surgical navigation.

Role of Mononuclear Rare Earth Metal Complexes in Promoting the Hydrolysis of 2-Hydroxypropyl p-Nitrophenyl Phosphate

Two long-chain multidentate ligands： 2,9-di-（n-2＇,5＇,8＇-triazanonyl）-1,10-phenanthroline （L^1） and 2,9-di- （n-4＇,7＇,10＇-triazaundecyl）-1,10-phenanthroline （L^2） were synthesized. The hydrolytic kinetics of 2-hydroxypropyl p-nitrophenyl phosphate （HPNP） catalyzed by the complexes of L^1 or L^2 with La（Ⅲ） or Gd（Ⅲ） have been studied in aqueous solution at （298.2±0.1） K, I=0.10 mol·dm^-3 KNO3 in pH 7.5-9.1, respectively, finding that the catalytic effect of GdL^1 was the best among the four complexes for hydrolysis of HPNP. Its kLnLH-1, kLnLand pKa are 0.047 mol^-1·L·s^-1, 0.000074 mol^-1·L·s^-1 and 8.90, respectively. This paper expounded the studied result with the structure of the ligands and the properties of the metal ions, and deduced the catalysis mechanism.