scholarly journals Effect of Diamine Addition on Structural Features and Physical Properties of Polyamide 6 Synthesized by Anionic Ring-Opening Polymerization of ε-Caprolactam

ACS Omega ◽  
2019 ◽  
Vol 4 (17) ◽  
pp. 17117-17124 ◽  
Author(s):  
Kyunghwan Oh ◽  
Hoyeon Kim ◽  
Yongsok Seo
Keyword(s):  
Physical Properties ◽  
Ring Opening ◽  
Polyamide 6 ◽  
Structural Features ◽  
Ring Opening Polymerization ◽  
Anionic Ring

In situsynthesis of polyamide 6/MWNTs nanocomposites by anionic ring opening polymerization

2009 ◽  
Vol 111 (3) ◽  
pp. 1278-1285 ◽  
Author(s):  
Dongguang Yan ◽  
Tingxiu Xie ◽  
Guisheng Yang
Keyword(s):  
Ring Opening ◽  
Polyamide 6 ◽  
Ring Opening Polymerization ◽  
Anionic Ring

scholarly journals Enhanced Tensile Properties of Multi-Walled Carbon Nanotubes Filled Polyamide 6 Composites Based on Interface Modification and Reactive Extrusion

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 997
Author(s):  
Min Park ◽  
Ji-un Jang ◽  
Jong Hyuk Park ◽  
Jaesang Yu ◽  
Seong Yun Kim
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Properties ◽  
Ring Opening ◽  
Reactive Extrusion ◽  
Polyamide 6 ◽  
Ring Opening Polymerization ◽  
Uniform Dispersion ◽  
Multi Walled Carbon Nanotubes ◽  
Anionic Ring ◽  
Walled Carbon Nanotubes

To induce uniform dispersion and excellent interfacial properties, we adopted a strategy of combining both polyamide 6 (PA6) grafting for multi-walled carbon nanotubes (MWCNTs) and reactive extrusion of PA6 matrix, based on anionic ring-opening polymerization of ε-caprolactam (CL). Compared to –COOH and –NCO treatments of MWCNTs, enhanced MWCNT dispersion and tensile properties of the composites were achieved using the applied strategy, and the tensile strength and modulus of the PA6-grafted MWCNT-filled PA6 composites were 5.3% and 20.5% higher than those of the purified MWCNT-filled PA6 composites, respectively. In addition, they were almost similar to the theoretical ones calculated by the modified Mori–Tanaka method (MTM) assuming a perfect interface, indicating that the tensile properties of MWCNT-filled PA6 composites can be optimized by PA6 grafting and reactive extrusion based on the anionic ring-opening polymerization of CL due to uniform MWCNT dispersion and excellent interfacial property.

Synthesis and characterization of novel β-cyclodextrin cored poly(α-caprolactone)s by anionic ring opening polymerization

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Yingzhi Guo ◽  
Changjiang Yu ◽  
Zhongwei Gu
Keyword(s):  
Molecular Weight ◽  
Physical Properties ◽  
Ring Opening ◽  
Monomer Conversion ◽  
Ring Opening Polymerization ◽  
Molar Ratio ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Anionic Ring ◽  
Feed Molar Ratio

Abstract By anionic ring opening polymerization initiated by cyclodextrin oxyanions generated from NaH and β-cyclodextrin(β-CD), novel biodegradable β- CD cored star-shaped poly(ε-caprolactone)s (s-PCLs) were synthesized and then characterized by means of FTIR, GPC, 1H-NMR. The effects of different feed molar ratios of NaH and β-CD on arm number and on the molecular weight of s-PCLs, and the relationship between the polymerization time and monomer conversion were investigated. Moreover, the physical properties of linear PCL (l-PCL) and s- PCLs with similar molecular weights but different arm number were studied and compared by DSC, SEM and intrinsic viscosity measurement, respectively. It was found that the feed molar ratio of NaH and β-CD is an important factor which influences both the molecular weight and arm number. The melting points and intrinsic viscosities of s-PCLs with similar molecular weights were lower than that of l-PCL, and were found to decrease with increasing arm number. Both SEM and AFM showed that the surface morphology of s-PCL films was different from that of l-PCL. These results indicated that s-PCL with different arms and physical properties could be synthesized using just a β-CD core by adjusting the feed molar ratio of NaH and β-CD

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