Thermal analysis and non-isothermal kinetics of poly(ethylene glycol) with different molecular weight

2014 ◽  
Vol 54 (12) ◽  
pp. 2872-2876 ◽  
Author(s):  
Ting Wei ◽  
Baicun Zheng ◽  
Hongling Yi ◽  
Yanfeng Gao ◽  
Weihong Guo
Keyword(s):  
Thermal Analysis ◽  
Molecular Weight ◽  
Ethylene Glycol ◽  
Isothermal Kinetics ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Kinetics Of ◽  
Different Molecular Weight

scholarly journals Studies on Chemical IR Images of Poly(hydroxybutyrate–co–hydroxyhexanoate)/Poly(ethylene glycol) Blends and Two-Dimensional Correlation Spectroscopy

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 507 ◽  
Author(s):  
Yeonju Park ◽  
Sila Jin ◽  
Yujeong Park ◽  
Soo Kim ◽  
Isao Noda ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Ethylene Glycol ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Poly Ethylene Glycol ◽  
Biodegradable Poly ◽  
Poly Ethylene ◽  
Increasing Temperature ◽  
Kinetics Of

Biodegradable poly-[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoates] (PHBHx) have been widely studied for their applications in potentially replacing petroleum-based thermoplastics. In this study, the effect of the high molecular weight (Mn = 3400) poly(ethylene glycol) (PEG) blended in the films of PHBHx with different ratios of PEG was investigated using chemical FTIR imaging. Chemical IR images and FTIR spectra measured with increasing temperature revealed that PEG plays an important role in changing the kinetics of PHBHx crystallization. In addition, two-dimensional correlation spectra clearly showed that thermal properties of PHBHx/PEG blend film changed when the blending ratio of PHBHx/PEG were 60/40 and 50/50. Consequently, PEG leads to changes in the thermal behavior of PHBHx copolymers.

Influence of Adding Different Poly (ethylene glycol) in the Biosynthesis of Bacterial Cellulose

2011 ◽  
Vol 418-420 ◽  
pp. 589-592
Author(s):  
Hai Fang Liu ◽  
Yu Hong Feng ◽  
Jin Ke Yan ◽  
De La Zhang ◽  
Jia Cheng Li
Keyword(s):  
Molecular Weight ◽  
Ethylene Glycol ◽  
Bacterial Cellulose ◽  
Culture Medium ◽  
Tensile Tests ◽  
Poly Ethylene Glycol ◽  
Sem Images ◽  
X Ray ◽  
Poly Ethylene ◽  
Different Molecular Weight

Bacterial cellulose-poly (ethylene glycol) composites (BC-PEG) were biosynthesized by adding different molecular weight of poly (ethylene glycol) into Acetobacter xylimum culture medium. The obtained BC-PEG composites were characterized by scanning electron microscopy (SEM), thermogravimetry (TG), X-ray diffractometry (XRD) and tensile test. SEM images showed that the morphology of BC-PEG composites changed. TG results indicated their thermal stability also changed. XRD profiles suggested their crystalline morphology no much difference. But the tensile tests appeared that the adding of different molecular weight PEG modified the mechanical properties of BC-PEG composites.

scholarly journals Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1156
Author(s):  
Dejia Chen ◽  
Lisha Lei ◽  
Meishuai Zou ◽  
Xiaodong Li
Keyword(s):  
Ethylene Glycol ◽  
Heterogeneous Nucleation ◽  
Isothermal Crystallization ◽  
Crystallization Process ◽  
Poly Ethylene Glycol ◽  
Ozawa Method ◽  
Isothermal Crystallization Kinetics ◽  
Fast Cooling ◽  
Poly Ethylene ◽  
Kinetics Of

The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(l-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time t1/2. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and growth.

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