Polyamides

Roda, Jan

doi:10.1002/9783527628407.ch7

Cited by 26 publications

(38 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initiator represents a key component for the anionic ROP of e-caprolactam and, therefore, influences significantly on the polymerization kinetics and the properties of obtained polymers [5,18,25,[28][29][30]. The results of the comparative study on the activity of CL 2 Mg (in the presence of magnesium halides) and widely used CLMgBr in the activated anionic polymerization of e-caprolactam are presented below.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the fast reaction rate (equilibrium content of polymer [17] is achieved for 5-10 min [25] and even in less than 5 min under optimized polymerization conditions [26]), this initiator was successfully used in the reaction injection molding technology to produce block copolymers of e-caprolactam with polyethers [25]. Other magnesium salt of e-caprolactam, magnesium di(e-caprolactamate) (CL 2 Mg), has received insignificant attention as initiator of e-caprolactam polymerization due to its low activity in comparison with CLMgBr [4,5,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Activated anionic ring-opening polymerization of ε-caprolactam with magnesium di(ε-caprolactamate) as initiator: effect of magnesium halides

et al. 2011

View full text Add to dashboard Cite

The activated anionic ring-opening polymerization of e-caprolactam initiated by 0.35 mol% of combined initiator, i.e., equimolar mixture of magnesium di(e-caprolactamate) (CL 2 Mg) with magnesium halides (MgCl 2 , MgBr 2 , and MgI 2 ) as well as of e-caprolactam magnesium bromide (CLMgBr) in the presence of 0.35 mol% of N-acetyl-e-caprolactam as an activator has been investigated in the temperature range 140-200°C. It was found that the reaction rate increased while the apparent activation energy decreased in the following series: CL 2 Mg/ MgCl 2 \ CL 2 Mg/MgBr 2 * CLMgBr \ CL 2 Mg/MgI 2 . In addition, the poly(ecaprolactam)s prepared with CL 2 Mg/MgX 2 (MgX 2 = MgCl 2 , MgBr 2 , and MgI 2 ) are characterized by slightly higher thermal stability than polymers obtained with CLMgBr as initiator. These observations were explained in terms of the coordination of Lewis acids (MgX 2 , where X = Cl, Br, and I) with imide carbonyl of N-acyllactam end groups leading to the increase of their reactivity and stability.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activated anionic ring-opening polymerization of ε-caprolactam with magnesium di(ε-caprolactamate) as initiator: effect of magnesium halides

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The carbon payloads used without 10, No.2 (2016) [160][161][162][163][164][165][166][167][168][169][170][171][172][173][174][175] functionalization are insoluble in the reaction medium. As known from detailed earlier studies [39], the initiation and propagation of lactam AAROP require an anionic initiator and an activator comprising imide links C(O)-N-C(O)-. It is important that this catalyst system should remain active in the presence of the carbon payloads and the solvent employed.…”

Section: Resultsmentioning

confidence: 99%

“…The higher M v in the latter case is because the bulk AAROP takes place at higher temperature, in the polar molten ECL and in strongly basic medium. These conditions favor complex side reactions leading to partially cross-linked PA6 characterized by increased molecular inhomogeneity [39]. between 20-35 µm with roundness values of 1.2-1.3.…”

Section: Resultsmentioning

confidence: 99%

Reactive microencapsulation of carbon allotropes in polyamide shell-core structures and their transformation in hybrid composites with tailored electrical properties

Oliveira¹,

Dencheva²,

Martins³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

“…The higher M v in the latter case is because the bulk AAP takes place at higher temperature, in the polar molten ECL and in strongly basic medium. These conditions favor complex side reactions leading to partially cross-linked PA6 characterized by increased molecular inhomogeneity [27].…”

Section: Resultsmentioning

confidence: 99%

Preparation and properties of metal-containing polyamide hybrid composites via reactive microencapsulation

et al. 2016

View full text Add to dashboard Cite

Polyamide 6 microcapsules (PAMC) loaded with 2-8 wt% of Cu, Zn or Fe and up to 30 wt% of Al particles are synthesized via activated anionic polymerization (AAP) of ε-caprolactam in suspension performed in the presence of the respective micro-or nanosized loads. The highmolecular weight porous PAMC are with typical diameters of 10-90 µm depending on the size of the metal filler particles. The latter are entrapped in the core of PAMC as proven by microscopy methods. The melt processing of the loaded microcapsules produced PA6/metal hybrid thermoplastic composites with homogeneous distribution of the loads without any functionalization. The crystalline structure of all PAMC and molded composites are studied by thermal and microfocus X-ray diffraction methods suggesting polymorph changes during the transition from PAMC to molded plates. Mechanical tests in tension showed that transforming Al-loaded PAMC into composites produces polyamide hybrids with higher modulus and strength at break. Measuring the conductivity and dielectric properties of the composites in linear and cyclic modes showed that 30 wt% of Al can change significantly the permittivity of the hybrid composites without increasing the conductivity of the PA6 matrix.

show abstract

Polyamides

Cited by 26 publications

References 93 publications

Activated anionic ring-opening polymerization of ε-caprolactam with magnesium di(ε-caprolactamate) as initiator: effect of magnesium halides

Activated anionic ring-opening polymerization of ε-caprolactam with magnesium di(ε-caprolactamate) as initiator: effect of magnesium halides

Reactive microencapsulation of carbon allotropes in polyamide shell-core structures and their transformation in hybrid composites with tailored electrical properties

Preparation and properties of metal-containing polyamide hybrid composites via reactive microencapsulation

Contact Info

Product

Resources

About