Shaoming Fang

Zhengzhou University of Light Industry, Cheng, Henan Sheng, China

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Publications (6)6.38 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: In this paper, polyhedral oligomeric silsesquioxanes (POSS) with three different substituents are blended with poly(L-lactic acid) (PLLA) solution to prepare the hybrid films. The three types of POSS are octa(3-chloroammoniumpropyl)silsesquioxane (OCAPS), octa(3-chloropropyl)silsesquioxane (OCPS) and octavinylsilsesquioxane (OVPS). The effects of POSS substituents on the dispersion and properties of PLLA are investigated by means of SEM, XRD, DSC, DMA, POM, TGA, tensile and in vitro tests. The results show that OCAPS and OCPS have better dispersion states than OVPS, supported by the fact that an obvious phase separation is observed in OVPS/PLLA hybrid film. OCAPS and OVPS hybrid materials show higher Tgs than that of PLLA, whereas OCPS acts as a plasticizer to decrease the Tg of PLLA. Meanwhile, the Tms of PLLA are all decreased by the incorporation of the three POSS. The thermal stability of PLLA has been improved by the presence of OCPS and OVPS. The addition of POSS does not change the crystalline structure of PLLA and POSS appears as the heterogeneous nucleating agents in PLLA matrix, as the Tcs of POSS/PLLA in the reheating cycles shift to lower temperatures. The elongations at break point of OCAPS and OCPS hybrid films increase due to their plasticizer effect when the mechanical force is put on. The hydrophobic character of OCPS and OVPS prohibits the degradation of PLLA, however, OCAPS/PLLA shows faster degradation rate than PLLA due to the high hydrophilic property of OCAPS.
    Journal of Macromolecular Science, Part A. 01/2012; 49(1):73-80.
  • [show abstract] [hide abstract]
    ABSTRACT: A series of organic-inorganic hybrid films were prepared based on octa(3-chloropropylsilsesquioxane) (OCPS) and poly(L-lactic acid) (PLLA) via simply solution blending method. The thermal, crystalline and mechanical properties of OCPS/PLLA hybrid films were characterized by Fourier transform infrared, scanning electron microscopy, energy dispersive spectrometer, differential scanning calorimetry (DSC), X-ray diffraction, polarized optical microscopy, thermogravimetric analysis (TGA), and tensile tests. The results showed that OCPS could be dispersed well at molecular level when its content was less than 3 wt % and began to crystallize in PLLA matrix when the content increased to 5 wt %. DSC study revealed that OCPS acted as a plasticizer to decrease both Tg and Tm of the PLLA matrix at various heating rates. The addition of OCPS did not change the crystal form of PLLA, while had an great influence on the cold crystallization and melting behaviors of PLLA in the second heating cycles. Moreover, the initial crystallinity of OCPS/PLLA was higher than that of pure PLLA. The results suggested that OCPS could be an effective heterogeneous nucleating reagent to promote the crystallization of PLLA. TGA showed that the PLLA thermal degradation mechanism remained unchanged, whereas the weight loss temperatures and residual weights were improved. Tensile tests indicated that the incorporation of OCPS into PLLA matrix changed the tensile behavior of the hybrid films from brittle to ductile, and the strain at break was improved remarkably as a result of the plasticizer effect of OCPS. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
    Journal of Applied Polymer Science 04/2011; 122(1):296 - 303. · 1.40 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: A novel series of organic-inorganic hybrid materials involving cage-like octa(3-chloroammoniumpropyl)silsesquioxane and Polyvinyl alcohol (OCAPS/PVA) were prepared via solution blending method. The obtained hybrid films were optically transparent and soluble in water. OCAPS/PVA hybrids were characterized by FT-IR, wide-angle X-ray diffraction (WAXD) scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA) and tensile test. The results showed that the hydrogen bond interactions were formed between OCAPS and PVA. OCAPS could be dispersed well in PVA matrix till its content was 10wt%, while the aggregation and crystallization of OCAPS were observed when the content was up to 15wt%. The glass transition temperature (T g ) of OCAPS/PVA was found to increase from 53°C to 60°C, and the melting temperature (T m ) decreased from 180°C to 171°C with increasing OCAPS content from 0wt% to 15wt%. The thermal stability of PVA main chain was improved by the addition of OCAPS and the thermal residue ratio also increased. The tensile strength of OCAPS/PVA decreased from 28MPa to 19MPa, while the elongation at break of hybrid films increased from 121% to 175%. KeywordsPolyhedral oligomeric silsesquioxane-Polyvinyl alcohol-Hybrid materials-Thermal properties-Mechanical properties
    Journal of Polymer Research 01/2010; 17(5):631-638. · 2.02 Impact Factor
  • Acta Polymerica Sinica - ACTA POLYM SIN. 01/2010; 010(8):1023-1029.
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    ABSTRACT: To reduce the smoke release of poly(vinyl chloride) (PVC) during burning, layered double hydroxides (LDHs) and zinc oxide (ZnO) powders were used to modify the polymer. The results indicated that the addition of LDHs‐ZnO had a significant effect on smoke suppression. The limiting oxygen index (LOI) reached a maximum value and the smoke density rank (SDR) exhibited a minimum value when the weight percentages of LDHs and ZnO in PVC were 3% and 2%, respectively. Thermal stabilities of the modified PVC and degradation products were investigated by means of thermogravimetry and pyrolysis‐gas chromatography‐mass spectra (Py‐GC‐MS). The LDHs‐ZnO obviously accelerated the decomposition of PVC to release hydrogen chloride, and the decomposed PVC consequently produced the trans‐conjugated polyene sequences, which easily formed crosslinked structures. However, a cyclization reaction in PVC chain without the additives produced aromatic compounds such as benzene, toluene, and naphthalene at 350°C. Even though, an amount of aromatic compounds was released from the PVC modified with LDHs‐ZnO at the temperature of 600°C, the content of the decomposed products is relatively lower compared to unmodified PVC.
    Journal of Macromolecular Science Part A 12/2005; 43(11):1807-1814. · 0.81 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: In this paper, a series of hybrid star PLLA (sPLLA) with different arm lengths was synthesized via the hydrosilylation between octakis(dimethylsiloxy) silsesquioxane (Q8M8) and functionalized PLLA macromolecules with vinyl end groups (mPLLA). mPLLA was synthesized by ring-opening polymerization of l-lactide using 2-hydroxyethylmethacryl as an initiator in the presence of stannous 2-ethylhexanoate as a catalyst. The obtained sPLLA has low polydispersity with polydispersity index values from 1.29 to 1.30. The arm numbers of sPLLA vary from 5 to 7 and decrease with the increase in the length of the mPLLA arm due to the steric hindrance, which are estimated by 1H NMR analysis. The branched structure of sPLLA is also evidenced by the lower intrinsic viscosity when compared with the linear mPLLA with similar molecular weight. Both the glass transition temperatures (T g’s) and melting temperatures (T m’s) of sPLLAs are higher than those of the mPLLA arms. The incorporation of polyhedral oligomeric silsesquioxane (POSS) does not change the crystalline structure of PLLA, while the crystallinity of sPLLA is enhanced as the result that the POSS core acts as a heterogeneous nucleating agent in the matrix to promote the crystallization ability of PLLA. High-resolution transmission electron microscopy observation suggests that POSS disperses in the crystalline PLLA matrix as 5–20 nm aggregates. Microspheres of sPLLA with mean diameter 1 to 2 μm were prepared via emulsion solvent evaporation method. The sPLLA microspheres have higher loading capacity and encapsulation efficiency and lower drug release rate than mPLLA microspheres.
    Colloid and Polymer Science 291(4). · 2.16 Impact Factor