News Details
ADR chain extender chain extender effects of polylactic acid
2017-2-27 12:18:09
ADR chain extender chain extender effects of polylactic acid, PLA production at home and abroad the most common problem is that the low molecular weight, the main reason is that the purity of lactide is too low, not 99.5% purity L - lactic acid, cause poor mechanical properties; Another situation is due to polylactic acid molecules contain respectively on both ends - COOH and - OH groups in water, in the machining process of open inevitable absorb moisture, according to the survey found that in PLA under the condition of moisture content of less than 200 PPM, the PLA's moisture is the main reason for decline in performance degradation, hot oxygen degradation factors is minor.
ADR chain extender to extender chain effect of poly (lactic acid) : one, the PLA water degradation
The balance of moisture content and PLA degradation. If the moisture content change, Mw and product performance also changes; Every extrusion or injection molding processing hydrolysis to PLA degradation.
ADR chain extender to extender chain effect of poly (lactic acid) (PLA) : 2, the effects of chain extender on the PLA molecular weight (ADR)
According to the principle of ADR of chain extender chain extender, PLA raised its molecular weight after the chain extender (molecular chain growth), the result causes - COOH and - OH bibulous groups to reduce and lower the water absorption. Help because Mw reduce chain extender and cause performance degradation.
PLA using ADR modified molecular weight increased, BASF experimental results have proved that.
The Product Mw vs Joncryl ADR Concentration for PLA
(NW 6300 d/ADR processed @ 220 * C, 9 min RT)
Final Mw after Processing
The influence of ADR content on the PLA molecular weight. ADR - 4368 - c/CS and ADR - 4370 - s by branched response to the greatest extent improve the molecular weight to the application of high melt strength, suitable for blown film, sheet, and low density foam; ADR - 4300 and ADR - 4385 by moderately branched reaction increase molecular weight to the high speed machining application, applicable to the stripe, low density foam, one-way and two-way stretch film; ADR - 4380 through the main chain and lower branched chain extender to obtain the rheological and mechanical properties of ideal balance, suitable for high density foam, sheet, strip, fiber (short fiber, monofilament), etc.
0.20.40.60.81.01.21.41.61.82.0 Joncryl ADR Concentration (% w/w)
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
ADR chain extender to extender chain effect of poly (lactic acid) (PLA) : 3, the performance of the modified PLA ADR chain extension agent
(1) the influence of shear rate on viscosity of PLA
In need of high melt strength, ADR - 4368 - c/CS and ADR - 4370 - s by branching reaction maximize the PLA melt strength, solved the homogenizing plastic type embryo, abnormal droop, obturator structure/problems such as low density foam;
In need of high elasticity, ADR - 4300 and 4385 through proper PLA branched reaction melt strength increase, to solve the deep concave shaped product hot forming, balance the orientation/performance, etc.;
ADR - 4380 depend on the linear chain extension increases the melt strength, to adapt to the change of the shear rate, solved the directional fiber, high shear reduced crystallization, injection molding, and other issues.
The influence of ADR to melt strength
Not to join the PLA control situation of ADR PLA + 0.2% ADR4368 control situation - properties of irregular; - continuous, shape rules;
- keep the bubble tube size is difficult; - keep the bubble tube size;
Noise - film; - film low noise, high melt strength; - low melt strength, easy to break; Double - production speed; - film width change will happen. - stable and uniform film size.
It can be seen that ADR of PLA melt strength increase close to or even greater than that of PS melt strength.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
ADR chain extender to extender chain effect of poly (lactic acid) : one, the PLA water degradation
The balance of moisture content and PLA degradation. If the moisture content change, Mw and product performance also changes; Every extrusion or injection molding processing hydrolysis to PLA degradation.
ADR chain extender to extender chain effect of poly (lactic acid) (PLA) : 2, the effects of chain extender on the PLA molecular weight (ADR)
According to the principle of ADR of chain extender chain extender, PLA raised its molecular weight after the chain extender (molecular chain growth), the result causes - COOH and - OH bibulous groups to reduce and lower the water absorption. Help because Mw reduce chain extender and cause performance degradation.
PLA using ADR modified molecular weight increased, BASF experimental results have proved that.
The Product Mw vs Joncryl ADR Concentration for PLA
(NW 6300 d/ADR processed @ 220 * C, 9 min RT)
Final Mw after Processing
The influence of ADR content on the PLA molecular weight. ADR - 4368 - c/CS and ADR - 4370 - s by branched response to the greatest extent improve the molecular weight to the application of high melt strength, suitable for blown film, sheet, and low density foam; ADR - 4300 and ADR - 4385 by moderately branched reaction increase molecular weight to the high speed machining application, applicable to the stripe, low density foam, one-way and two-way stretch film; ADR - 4380 through the main chain and lower branched chain extender to obtain the rheological and mechanical properties of ideal balance, suitable for high density foam, sheet, strip, fiber (short fiber, monofilament), etc.
0.20.40.60.81.01.21.41.61.82.0 Joncryl ADR Concentration (% w/w)
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
ADR chain extender to extender chain effect of poly (lactic acid) (PLA) : 3, the performance of the modified PLA ADR chain extension agent
(1) the influence of shear rate on viscosity of PLA
In need of high melt strength, ADR - 4368 - c/CS and ADR - 4370 - s by branching reaction maximize the PLA melt strength, solved the homogenizing plastic type embryo, abnormal droop, obturator structure/problems such as low density foam;
In need of high elasticity, ADR - 4300 and 4385 through proper PLA branched reaction melt strength increase, to solve the deep concave shaped product hot forming, balance the orientation/performance, etc.;
ADR - 4380 depend on the linear chain extension increases the melt strength, to adapt to the change of the shear rate, solved the directional fiber, high shear reduced crystallization, injection molding, and other issues.
The influence of ADR to melt strength
Not to join the PLA control situation of ADR PLA + 0.2% ADR4368 control situation - properties of irregular; - continuous, shape rules;
- keep the bubble tube size is difficult; - keep the bubble tube size;
Noise - film; - film low noise, high melt strength; - low melt strength, easy to break; Double - production speed; - film width change will happen. - stable and uniform film size.
It can be seen that ADR of PLA melt strength increase close to or even greater than that of PS melt strength.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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