Crystallization kinetics and morphology of biodegradable poly(l-lactic acid)/graphene oxide nanocomposites: Influences of graphene oxide loading and crystallization temperature

2012 ◽  
Vol 527 ◽  
pp. 40-46 ◽  
Author(s):  
Huishan Wang ◽  
Zhaobin Qiu
Keyword(s):  
Graphene Oxide ◽  
Lactic Acid ◽  
Crystallization Kinetics ◽  
Crystallization Temperature ◽  
Biodegradable Poly

Crystallization kinetics and morphology of biodegradable poly(lactic acid) with a hydrazide nucleating agent

2015 ◽  
Vol 45 ◽  
pp. 101-106 ◽  
Author(s):  
Ting Xu ◽  
Anjiang Zhang ◽  
Yongqing Zhao ◽  
Zhen Han ◽  
Lixin Xue
Keyword(s):  
Lactic Acid ◽  
Crystallization Kinetics ◽  
Nucleating Agent ◽  
Poly Lactic Acid ◽  
Biodegradable Poly

scholarly journals An Investigation of the Effect of Chitosan on Isothermal Crystallization, Thermal Decomposition, and Melt Index of Biodegradable Poly(L-lactic acid)

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Yan-Hua Cai ◽  
Li-Sha Zhao
Keyword(s):  
Thermal Decomposition ◽  
Lactic Acid ◽  
Crystallization Temperature ◽  
Isothermal Crystallization ◽  
Decomposition Temperature ◽  
Temperature Zone ◽  
Melt Index ◽  
Analysis Instrument ◽  
Biodegradable Poly ◽  
Higher Temperature

Biodegradable chitosan (CS) was introduced into another biodegradable poly(L-lactic acid) (PLLA) to prepare the PLLA/CS composites, and the effect of CS on thermal behavior and melt index of PLLA was investigated using modern testing technologies including optical depolarizer, thermogravimetric analysis instrument, and melt index instrument. The relevant testing results showed that both crystallization temperature and CS concentration affected the isothermal crystallization behavior of PLLA. Compared to neat PLLA, thet1/2of PLLA/5% CS decreased from 2991.54 s to the minimum value 208.76 s at 105°C. However, thet1/2of PLLA/CS composites in high crystallization temperature zone was different from that in low crystallization temperature zone. The increase of CS concentration and heating rate made the thermal decomposition temperature of PLLA/CS composites shift to higher temperature. The melt index results indicated that 3% CS made the fluidity of PLLA become better.

Non-Isothermal Crystallization Kinetics of Polyvinyl Alcohol-Graphene Oxide Composites

2013 ◽  
Vol 446-447 ◽  
pp. 206-209
Author(s):  
Cheng Peng Li ◽  
Mary She ◽  
Ling Xue Kong
Keyword(s):  
Graphene Oxide ◽  
Side Effects ◽  
Crystallization Kinetics ◽  
Crystallization Temperature ◽  
Isothermal Crystallization ◽  
Nucleating Agent ◽  
Crystallization Time ◽  
Isothermal Crystallization Kinetics ◽  
Blending Method ◽  
Kinetics Of

Polyvinlyl alcohol (PVA)/graphene oxide (GO) composites are prepared by solution blending method. And the non-isothermal crystallization kinetics of as-prepared composites is evaluated by differential scanning calorimetry (DSC). The results indicate the graphene oxide can significantly modify the non-isothermal crystallization behavior of the PVA, for instance improved crystallization temperature and prolonged crystallization time. Enhanced crystallization temperature illustrates that GO can act as effective nucleating agent. However, prolonged crystallization time means that GO can retard the whole crystallization. Further kinetics analysis indicates that both the crystallization kinetics of neat PVA and PVA/GO match the Mo model very well. According to the Mo model, during the whole crystallization process, graphene oxide perform as a retardant. In conclusion, graphene oxide can act as effective nucleating agent due to strong interaction bewteen graphene oxide and PVA matrix. On the other hand, graphene oxide loaded may lead to other side effects. This side effects may lead to the retarded crystallization speed finally.

Peculiar crystallization kinetics of biodegradable poly(lactic acid)/poly(propylene carbonate) blends

2015 ◽  
Vol 55 (12) ◽  
pp. 2698-2705 ◽  
Author(s):  
Maria Laura Di Lorenzo ◽  
Roxanne Ovyn ◽  
Mario Malinconico ◽  
Paolo Rubino ◽  
Yves Grohens
Keyword(s):  
Lactic Acid ◽  
Propylene Carbonate ◽  
Crystallization Kinetics ◽  
Poly Lactic Acid ◽  
Biodegradable Poly ◽  
Poly Propylene ◽  
Kinetics Of
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