Investigation of Nonisothermal Crystallization Behaviors of Poly and Silica Nanocomposites Using Differential Scanning Calorimetry

2005 ◽  
pp. 39-44
Author(s):  
Ling Xue Kong ◽  
Z. Peng
Keyword(s):  
Differential Scanning Calorimetry ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Crystallization Behaviors ◽  
Silica Nanocomposites

Investigation of Nonisothermal Crystallization Behaviors of Poly and Silica Nanocomposites Using Differential Scanning Calorimetry

2005 ◽  
Vol 295-296 ◽  
pp. 39-44 ◽  
Author(s):  
Ling Xue Kong ◽  
Z. Peng
Keyword(s):  
Differential Scanning Calorimetry ◽  
Cooling Rate ◽  
Crystallization Temperature ◽  
Self Assembly ◽  
Degree Of Crystallinity ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Crystallization Behaviors ◽  
Silica Nanocomposites

Nonisothermal crystallization behaviors of PVA and poly (vinyl alcohol) and Silica (PVA/SiO2) nanocomposites prepared via a self-assembly monolayer (SAM) technique are investigated in this study. Differential scanning calorimetry (DSC) is used to measure the crystallization temperature and enthalpy of PVA and nanocomposites in nitrogen at various cooling rate. The results show that the degree of crystallinity of PVA and nanocomposites decreases when the SiO2 content increases but increases with an increasing cooling rate. The peak crystallization temperature decreases with an increasing cooling rate.

Non-Isothermal Crystallisation Kinetics of Polyamide 6/Mesoporous Silica Nanocomposites

2007 ◽  
Vol 15 (7) ◽  
pp. 561-567
Author(s):  
Qingyuan Hu ◽  
Xiangling Ji ◽  
Yunfeng Lu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Mesoporous Silica ◽  
Polyamide 6 ◽  
Nucleating Agents ◽  
Scanning Calorimetry ◽  
Crystallisation Kinetics ◽  
Silica Nanocomposites ◽  
Crystallisation Process ◽  
Isothermal Crystallisation ◽  
Kinetics Of

Non-isothermal crystallisation kinetics of a polyamide 6/mesoporous silica nanocomposite (PA6-MS) has been investigated by differential scanning calorimetry (DSC) at different cooling rates. Mandelkern, Jeziorny-Ziabicki and Ozawa methods were applied to describe this crystallisation process. The analyses show that the mesoporous silica particles act as nucleating agents in the composite and that the Avrami exponent n varies from 3.0 to 4.6. The addition of mesoporous silica influenced the mechanism of nucleation and the growth of polyamide 6 (PA 6) crystallites.

Nonisothermal Crystallization Kinetics of Poly(m-xylylene adipamide)

2014 ◽  
Vol 971-973 ◽  
pp. 103-106
Author(s):  
Xiao Hua Gu ◽  
Peng Zeng ◽  
Xi Wei Zhang ◽  
Xue Song
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystallization Kinetics ◽  
Three Dimensional ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Thermal Nucleation ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of ◽  
Dimensional Crystal

Abstract.In this paper, the nonisothermal crystallization kinetics was investigated by differential scanning calorimetry for the poly(m-xylylene adipamide) (MXD6) which were prepared by polymerization in reactor. The Avrami theory modified by Jeziorny and Z.S. Mo equation were used to describe the nonisothermal crystallization kinetics. The analysis based on the Avrami theory modified by Jeziorny shows that the Avrami exponent n of MXD6 ranges from 2.3 to 3.3, Moreover, both Avrami exponent (n) were around 3.0, which probably suggests a thermal nucleation and a three-dimensional crystal growth. The good linearity of the plots indicates the successful application of Z.S. Mo method in this case.

Melting, Crystallization Behaviors and Mechanical Properties of iPP Nucleated by β Nucleation Masterbatches

2014 ◽  
Vol 941-944 ◽  
pp. 1229-1232
Author(s):  
Guo Rui Dou ◽  
Qiang Dou
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Impact Strength ◽  
Isotactic Polypropylene ◽  
Tensile Strain ◽  
Mechanical Tests ◽  
Crystalline Form ◽  
Scanning Calorimetry ◽  
Crystallization Behaviors ◽  
Injection Molded

Injection-molded β-isotactic polypropylene (β-iPP) specimens were prepared by adding three β nucleation masterbatches, i.e., NT-MA, NT-MB and NT-MC, respectively. The melting, crystallization and mechanical properties of β-iPP specimens were investigated by means of differential scanning calorimetry (DSC) and mechanical tests. It is revealed that β crystalline form contents were enhanced by the β nucleation masterbatches, and the β contents of the cores were higher than those of the skins of injection molded specimens. The tensile strain at break and Izod notched impact strength of iPP were greatly improved by the β nucleation masterbatches. It was found that the β nucleation efficiency was in the order: NT-MC > NT-MA > NT-MB.

Miscibility and crystallization kinetics of poly(ε- caprolactone)/bezoxazine blends

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Hsiu-Jung Chiu ◽  
Ruey-Shi Tsai ◽  
Jieh-Ming Huang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Crystallization Kinetics ◽  
Equilibrium Temperature ◽  
Cooling Process ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Polarized Optical Microscopy ◽  
Equation Analysis ◽  
Kinetics Of

Abstract The miscibility and crystallization kinetics of the blends of poly(e- caprolactone) (PCL) and bezoxazine (B-m) resin was investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that PCL/B-m blends were miscible in the melt. Thus the blend exhibited a single glass transition temperature (Tg), which increased with increasing B-m composition and the crystal equilibrium temperature (Tmo) depressed with the addition of B-m from the Hoffman-Weeks equation analysis. The freezing crystallization temperature (Tfc) for the nonisothermal crystallization on the cooling process, and the spherulitic growth and overall crystallization rates of PCL for the isothermal crystallization were depressed with the addition of B-m component, attributing it to the dilution of PCL concentration due to the addition of B-m.

Isothermal Crystallization Behavior of PLA/PIL Composites

2015 ◽  
Vol 1096 ◽  
pp. 465-469
Author(s):  
Ping Zhou ◽  
Mi Zhou ◽  
Jing Ying Hu ◽  
Xin Qian
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ionic Liquid ◽  
Heterogeneous Nucleation ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Poly Ionic Liquid

The effect of Poly (ionic liquid) (PIL) on the crystallization of polylactide (PLA) has been investigated by means of differential scanning calorimetry. The nonisothermal crystallization result showed that PIL enhanced the crystallization of PLA. The Avrami method was used to describe the isothermal crystallization behavior of PLA/PIL composites. The Avrami exponent (n) revealed that the PIL accelerated PLA crystallization through heterogeneous nucleation.

Kinetic nature of hard magnetic Nd50Al15Fe15Co20 bulk metallic glass with distinct glass transition

2004 ◽  
Vol 19 (5) ◽  
pp. 1307-1310 ◽  
Author(s):  
L. Xia ◽  
M.B. Tang ◽  
H. Xu ◽  
M.X. Pan ◽  
D.Q. Zhao ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Ideal Model ◽  
Scanning Calorimetry ◽  
Suction Casting ◽  
Crystallization Behaviors ◽  
Glass Forming

A hard magnetic Nd50Al15Fe15Co20 bulk metallic glass (BMG) was prepared in the shape of a rod up to 3 mm in diameter by suction casting. The glass transition and crystallization behaviors as well as their kinetic nature have been studied. In contrast to the previously reported hard magnetic Nd–Al–Fe–Co BMGs, Nd50Al15Fe15Co20 as-cast rod exhibits a distinct glass transition and multistep crystallization behaviors in the differential scanning calorimetry traces and lower coercivity. The BMG provides an ideal model for the investigation of glass transition and crystallization of hard magnetic Nd–Al–Fe–Co glass-forming alloys.

Sign in / Sign up

Export Citation Format

Share Document