Advanced Materials Research Vols. 690-693

Abstract: This study evaluates the role of antistripping agents to resist moisture-induced damage in asphalt binders. A total of five different types of antistripping agents are used. Plastomer and elastomer modified asphalt binders are used to modify the original base binder. Functionalized and non-functionalized AFM tips are used to determine adhesion in asphalt. With-CH₃ tip, lime is found to be the most effective to protect moisture damage in asphalt binder as the adhesion loss is almost zero. The statistical tests show the Pearson values are very close to-1 that indicates a good correlation among the variables. Also the p-values are well below the prescribed value of 0.2% that indicates the test results to be significant from the statistical point of view.

Abstract: Solubilities of cellulose in several ionic liquids were investigated by using Thermal Platform Polarizing Microscope (TPPM) and mechanical stirring. The results showed that all the ionic liquids used could dissolve cellulose except 1-ethyl-3-methylimidazolium bromide ([EMIM]Br). The dissolution process of cellulose experienced five steps including infiltration, limited swelled, partially dissolved, dissociation and completely dissolved. Ionic liquids with the cellulose-dissolving temperatures from low to high in sequence was 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) < 1-butyl-3-methylimidazolium acetate ([BMIM]Ac) < 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) < 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) < 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) < 1-benzyl-3-methylimidazolium chloride ([BZMIM]Cl), while the solubility reduced in turn and the melting points or viscosities of the ionic liquids increased in the same order. Addition of some N,N-dimethyl sulfoxide to the solvents promoted ionic liquids to dissolve cellulose quickly. When dissolution process was applied by mechanical stirring, cellulose partially swelled and looked like "Lamb skewers" before dissolved. The dissolution mechanism was discussed.

Abstract: This paper, first of all, demonstrates the comparison between simulated results and direct measurements of the absorbing performance of polymer wool. It is found that simulated results are statistically coincided well with experiment results. Secondly, this paper discusses the influence of Biot parameters on the absorbing performance of the polymer wool. Besides, the influencing rules of these factors on the absorbing performance of the polymer wool are analyzed as well. This has great significances to the application of the polymer wool on noise reduction in automobile.

Abstract: A serious of silane-terminated poly (urethane-imide) (Si-PUI) was synthesized via prepolymer method using polycarbonatediols (PCDL), 2,4-tolylene diisocyanate (TDI), 4,4'-Oxydiphthalic Anhydride (ODPA) and silane coupling agent KH-550. The structure of the products was characterized by FT-IR. The thermal properties were measured by thermal gravimetric analysis (TGA). The thermal mechanical behavior was investigated by dynamic mechanical analysis (DMA).The mechanical characteristic was measured by tensile tests. The water absorption (Wa) was also been tested. With the imide content increasing, the thermal stability, tensile strength and storage modulus of poly (urethane-imide) improve significantly, and the glass transition temperature rises. The introduction of silanes improves the water resistance and further enhances the thermal stability of poly (urethane-imide).

Abstract: In this paper, ternary blends of PVC mixed with α-methyl styrene-acrylonitrile (α-MSAN) and toughening modifier was prepared, with the aim to obtain a high performance PVC profile with an improved heat resistant temperature, better impact property and good processability. The results of dynamic mechanical analysis (DMA) showed the good miscibility owing to the additional intermolecular interaction between α-hydrogen of PVC and AN of α-MSAN. The glass transition temperature (Tg) and vicat softening temperature (VST) were improved remarkably with introduction of α-MSAN due to excellent heat resistant property of α-MSAN. With regard to mechanical and process properties, the impact strength and dynamic rheological property were evaluated.

Abstract: Polymer blends consisting of chloride polyethylene (CPE), and enzymatic hydrolysis lignin(EHL) were prepared by compression molding. The thermal and mechanical properties of EHL-CPE composites were investigated. The results showed that the presence of EHL, which interfered with the intramolecular and intermolecular interactions and Impact strength of CPE were improved. The values of impact strength and thermal stability time rose quickly with ncreasingEHL content from 5 to 20 phr.There was a obvious increase color change time in Congo red dipstick experiment of CPE by adding EHL. The thermal testing results showed that EHL could be a novel additive for increasing thermal stability of CPE.

Abstract: The present work was concerned with the study on relationship between the migration level of BPA and thermal-oxidative aging degree of PC used as food and packaging materials. It was indicated that with the increasing of thermal-oxidative aging time, the migration level of BPA increased. The migration level was far beyond the GB/T5009.99-2003 (China). Variation of phenolic hydroxyl absorption intensity in IR spectra and the maximum absorption wavelength red shift of benzene in UV-Vis spectra indicated the same law; Initial weight loss temperature and maximum weight loss rate temperature of PC after thermal-oxidative aging were reduced by 1-2°C and 3-5°C respectively, and the thermal stability declined

Abstract: The water-soluble cationic polyfluorene derivatives PFP-N(Me)3+I- and PFP-T containing the thiazoline cycle on side chain was designed and synthesized. The preliminary bioassay was carried out for the thiazolines and polymers at different concentrations. The antibacterial activity of the polymers and thiazolines were determined with E.coli by growth inhibition assays. The results demonstrate that the polymer containing thiazoline cycle (PFP-T) has a higher inhibition ratio against E.coli than the thiazoline compound itself and the corresponding thiazoline quaternary ammonium.

Abstract: The cationic polymer PEA was synthesized by ring-opening reaction and quaterisation with epichlorohydrin and β-hydroxy alkyl propyl ether amine as the main materials.Study on the efffect of rate of charge, reaction time and reaction temperature on cationic degree and epoxy value. Capability of adsorption on the sand and anti-swelling resistance were studied. The results showed that the best polymerization conditions as follows,reaction temperature was 60 °C, reaction time was 6 h, the rate of charge of epichlorohydrin toβ-hydroxy alkyl propyletheramine was 2.5:1. Under these conditions , the cationic degree of PEA was 3.962 mmol/g, epoxy value was 0.12. Then it was performed the water absorption.

Abstract: UV-Writing Poly(FPS-co-GMA) for optical waveguide was synthesized and the refractive index of the polymer film was tuned in the range of 1.460~1.555 at 1550 nm by mixing with bis-phenol-A epoxy resin. The film, which was made by spinning coated the Poly(FPS-co-GMA) with photo initiator, had good UV light lithograph sensitivity. The optical waveguides with very smooth top surface were fabricated from the resulting polymer by direct UV exposure and chemical development. The propagation losses of the channel waveguides were measured to be below 0.6 dB/cm at 1550 nm.