Talcum powder, zinc oxide column brace organic soap stone composite filler on the crystallization of

2014-12-26

Polylactic acid is a kind of aliphatic polyester thermoplastic material, its main synthetic raw materials derived from renewable crops, is a kind of very has the application prospect of high performance material, in recent years is widely used in biomedical, food packaging, textile industry and engineering plastics. Polylactic acid (PLA), in the actual production process is low impact strength, brittle, heat distortion temperature and with a long cycle, slow crystallization rate, crystallization, these defects to a certain extent, affected the development and application of poly (lactic acid) (PLA). Research has found that a small amount of inorganic layered silicate modification agent can be used as a filler added to the substrate poly (lactic acid) (PLA), not only can increase the crystallization rate, enhance the crystallization properties of poly (lactic acid) (PLA), also can enhance the thermal stability and mechanical properties of polylactic acid materials.

Talcum powder is a kind of infinite nucleating agent, but because of its surface containing hydrophilic gene, has the high surface energy, lead to poor affinity with the hydrophobic polymer, thus the talcum powder surface treatment can improve the talcum powder and polymer dispersion and interface compatibility. Soapstone is unique to China's xinjiang 38 surface structure of layered silicate, its excellent surface properties, swelling properties, cation exchange capacity and high-profile, insert nanometer zinc chloride to soap stone layer between with hexadecyl trimethyl ammonium bromide in the organic modification preparation of zinc oxide column brace soapstone. With zinc oxide column brace organic soapstone as fillers added to the polylactic acid materials can not only improve the performance of poly lactic acid material, also can be the excellent properties of nanometer zinc oxide materials.

(1) the talcum powder after octadecyl trimethyl ammonium bromide intercalating modified after processing, in 9.42 ° diffraction peaks decreased significantly, and translation to the low Angle area, talcum powder layer spacing increases, colleagues because the surface of modified talcum powder with good interfacial compatibility of polylactic acid matrix, but also to the preparation of intercalated polylactic acid matrix nanocomposites;

(2) zinc oxide column brace organic soapstone, stripped nanoscale soap flake layer formation, heterogeneous nucleation effect, together with the modified talcum powder composite PMTZ3 crystallinity of 43.0%, a 87.0% increase over the Po;

(3) add 0.3 servings of zinc oxide column brace organic soap stone, the tensile strength of the material reached its maximum 40.3 MPa, increased about 140.9% than the pure polylactic acid; Composite material thermal decomposition temperature of 357.79 ℃, is 7.07 ℃ higher than the pure polylactic acid. Organic zinc oxide column brace soapstone and the composite filler modified talcum powder can effectively improve the mechanical properties of polylactic acid based composite material and thermal stability.