Papers by Author: Xi Hai Hao

Abstract: Taking glycerol as the plasticizer, through its effect on melting and crystallization of PVA, this paper researches on the plasticizing properties and mechanism of PVA, and provides experimental and theoretical basis for the realization of PVA’s melt processing. Research Methods: Matching samples respectively, mix each sample in an electric high-speed mixer with a mixing temperature of 80 °C. And then, put each sample in a Banbury mixer, mixing for 10 minutes with a rotational speed of 45rm/min. Take out each sample to analyze its characterization and do some tests, including infrared analysis, DSC test, X-ray diffraction test, and rheological curve measurement. Experimental Results: After adding glycerol, there exist two more absorption peaks near the point of 1621cm-1 in the PVA infrared spectrum, and the crystallization peak at 1267cm-1 is decreased gradually. In the DSC chart, when the amount of glycerol increasing to 16.67%, the melting point of PVA is decreased to 212 °C, and its melting range is 191 °C-223 °C. Under this condition, the melting range has been completely separated from the decomposition temperature range. X-ray diffraction shows that glycerol is added no significant effect on the diffraction angle of the PVA, the diffraction peak intensity decreased significantly increases the degree of dispersion. Under the same temperature, with the shear rate increasing, the shear viscosity has a downward trend; as the temperature increases, the shear viscosity and shear stress of the system are gradually decreasing. Conclusion: Glycerol may lower the melting temperature because it can improve the segmental mobility of PVA and reduce the crystalline regions. However, the amount of glycerol should not be too much, or the plasticizing effects will be drastically reduced because of the separation. The research also find that a certain amount of glycerol used alone cannot reduce the decomposition temperature but decrease the melting temperature, which still cannot meet the melt processing conditions. The excessive glycerol can easily be precipitated from PVA, resulting in the product surface being oily and crisp.

Abstract: BMH is a new type of inorganic antibacterial agent. However, there is few study about BMH application in plastic film. So, in this study, BMH/PE films prepared by rolled was investigated in antimicrobial, mechanical and optical properties with different BMH contents. The results showed that the antibacterial properties increased with the BMH content, and the antibacterial films had strong antibacterial function when the adding amount of BMH was equal or greater than 2%. The mechanical properties firstly increased with the BMH content and then rapidly decreased. The optical properties decreased with BMH content. Taking all properties of the film into account in the study, the antimicrobial film contained 1% BMH was best.

Abstract: The antifungal PVA film was fabricated by addition of the clove oil/β-cyclodextrin (β-CD) inclusion complex into PVA. The migration of clove oil in different food simulation solution (A: 10% ethanol water. B: 50% ethanol water. C: 60% glycerin-water mixture. D: n-hexane) were evaluated by using solution food simulation and then treated with linear regression analysis. The diffusion coefficient was cultivated out by Matlab software. The migration of clove oil which was embedded by β-CD in PVA film was influenced by the quality of food simulation solution to a great degree and the relation among the migration rate was A>B>D>C. The film structure was loosed and the migration gallery was increased by adding clove oil/β-cyclodextrin inclusion complex. The migration amount in simulations was positively correlated with time and diffusion coefficient.This kind antibacterial film can be used in low water activity food system and kept long-term antibacterial action.

Abstract: The antibacterial PVA film was produced by addition of the clove oil/β-cyclodextrin(β-CD) inclusion complex into PVA directly with solvent salivating. The formation of clove oil /β-CD inclusion complex was characterized by Fourier transform infrared (FTIR).The influence of different additive amount of inclusion complex on the mechanical properties, transparency, and moisture permeable performance of the film had been studied. The elongation at break of films decreased in a low degree when the adding was less than 20%; The transmittance of films declined apparently when the inclusion complex adding was above 15%, and the visuality of the films didn’t change when the adding was over 25%. The inclusion complex adding had effect on the moisture permeability of films, and moisture permeability of films increased sharply when the adding was more than 15%.

Abstract: The antifungal PVA film was fabricated by addition of the clove oil/β-cyclodextrin inclusion complex into PVA, which is acted as the basic packaging material. The mechanical properties, oxygen permeability and the bacteriostatic action of the film varied with the additional amount of inclusion complex. The tensile strength of PVA film decreased with the addition of inclusion complex and the effect is little when the amount was less than 25%. Adding less than 25% had no obviously effect on oxygen permeability of the film. It proved that pure PVA films have no antibacterial property and the growth of aspergillus was inhibited in different degrees when the content was different. The growth range of aspergillus is smaller and the bacteriostatic action to aspergillus is increased with the increase of inclusion complex amount of agent. The inhibitory zone appeared when the inclusion complex amount was more than 20%.