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Fundamental Studies on the Thermoplastic Konjac Glucomannan/Polylactide Blends

Author: XuChangGang
Tutor: LuoXueGang
School: Southwest University of Science and Technology
Course: Applied Chemistry
Keywords: Glucomannan Polylactic acid Thermoplastic modified Melt blending Basic Research
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 57
Quote: 0
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Abstract


The projects funded under the \The konjac glucomannan sugar (KGM) as raw material, surrounding environment-friendly, meet the requirements of new thermoplastic materials research and development, study the basic characteristics of a thermoplastic glucomannan polylactic acid melt blending materials. And for the konjac glucomannan thermoplastic modified polylactic acid melt blending compatibility characteristics, thermal properties, the rheological properties of the melt blending and application characteristics, system testing and analysis. The results show that: (1) konjac glucomannan by methyl acrylate and vinyl acetate thermoplastic modified with hydrophobic and oleophobic characteristics; and maintain a fully biodegradable performance, and the cycle is controlled. Thermoplastic glucomannan IR spectrum at 1062cm-1, 1635 cm-1, 3373 cm-1 at characterized in the disappearance of the absorption peak; Meanwhile, in the 1089 cm-1 and 1164cm-1, produced a glucomannan ring on C6-O-CO stretching vibration of the characteristic absorption of the CO stretching vibration peak and methacrylate functional group-COOCH3, characteristic absorption peaks. Its thermal decomposition temperature is increased about 70 ℃ to about 320 ℃, a glass transition temperature of 18 ° C, having the properties of certain thermoplastic processing. (2) thermoplastic glucomannan / polylactic acid melt blending research on thermal analysis and scanning electron microscopy the thermoplastic GLUCOMANNAN with poly lactic good compatibility system, thermoplastic blends glucomannan / polylactic acid there is only one glass transition temperature in the range between the two single-component, and increases with increasing polylactic acid; thermoplastic the glucomannan / polylactide blends the liquid nitrogen brittle sectional observed at 5000-fold, and rendered a relatively flat cross-sectional state, and does not appear the interface phase. (3) has a certain regularity and controllability thermoplastic glucomannan / polylactic acid blends dynamic rheological properties, the blends melt strength increasing As the thermoplastic GLUCOMANNAN increase. Which enhanced liquidity thermoplastic glucomannan and poly lactic acid melt strength increase; weakened increase thermoplastic the temperature sensitivity Glucomannan / polylactic acid blends with the thermoplastic glucomannan; same time , blends of thermoplastic Glucomannan / polylactic acid does not appear the phenomenon of phase separation. (4) as control the rheological properties of the low density polyethylene, polylactic acid controllable to improved processing properties of the thermoplastic glucomannan. Wherein, in 180 ℃, PE's balance torque 5.0Nm, the plasticizing time of 40s; when thermoplastic Glucomannan / polylactic acid ratio of 40/60 blend material balance torque 4.8nm, plasticized 50s, PE is closer conducive processing; maximum torque value and balance torque value thermoplastic glucomannan / polylactic acid blends decreased with increasing temperature. When the temperature from 160 ℃ rose to 190 ℃, thermoplastic Glucomannan / polylactic acid ratio of 40/60 when the maximum torque value of the blend material dropped from 26.6Nm 23.7Nm, can effectively reduce the energy in the production process consumption; balancing torque dropped from 7.8Nm 2.6Nm, vary greatly; same time the plasticizing time from the 130s down to 50s. (5) With thermoplastic glucomannan content increases, the tensile strength decreased, elongation at break increases gradually. Wherein greater than 50% of the content of the polylactic acid, the tensile strength of the composite material is more than 20MPa, and when the the thermoplastic glucomannan ratio is 80%, the elongation at break increased to a maximum of 520.5%. When thermoplastic Glucomannan / polylactic acid ratio of 40/60, a blend material having a higher overall performance, its tensile strength was 36.5MPa, the elongation at break was 234.8%. Thermoplastic glucomannan / polylactic acid blends the impact strength with the increase of thermoplastic glucomannan increase, wherein when the thermoplastic glucomannan was 80%, the impact strength for pure poly lactic acid 2.5 times or so.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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