Cover Picture: Plasma Process. Polym. 7/2018

Almansoori, Alaa; Masters, Robert; Abrams, Kerry J.; Schäfer, Jan; Gerling, Torsten; Majewski, Candice; Rodenburg, Cornelia

doi:10.1002/ppap.201870015

Cited by 3 publications

(4 citation statements)

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“…The three samples display quite similar spectra in the 4000–600 cm −1 being typical of PA6 and PA12 30,31 . Thus, the bands at 3298–3300 cm −1 are assigned to hydrogen‐bonded stretching vibrations in secondary NH groups.…”

Section: Resultsmentioning

confidence: 79%

“…720 cm −1 . Based on previous detailed spectral studies on PA6 and PA12, 30,31 it can be assigned to the rocking vibrations of more than four consecutive methylene groups. As expected, the relative intensity of this band is higher in PA12 with 11 CH 2 groups in the repeat unit (curve 2) and in the PA12‐6 copolymer (curve 3) than in PA6 MP (curve 1) with five CH 2 groups (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and properties of neat, hybrid, and copolymeric polyamide 12 microparticles and composites on their basis

Dencheva

Braz

Denchev

2021

J of Applied Polymer Sci

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Neat and hybrid polyamide 12 (PA12) based powders are important raw materials for additive manufacturing. This study describes a facile method for the synthesis of pure, hybrid and copolymeric microparticulate materials based on one‐pot activated anionic ring‐opening polymerization (AAROP) of laurolactam in solution. The results reveal the possibility to obtain in good yields, for reaction times of 2 h and temperatures of up to 110°C neat and hybrid PA12 microparticles (MP) carrying metal or carbon fillers. Copolymeric PA12/PA6 MP can also be successfully prepared. All MP materials are analyzed by spectral, microscopy, thermal, and synchrotron X‐ray scattering methods in order to clarify their morphology, chemical and crystalline structure, melting and degradation behavior. The melting temperature of the PA12 MP is lower than of the commercial PA12, the presence of metal particles or copolymerization with PA6 additionally decrease it well below 170°C. The composites prepared by compression molding of PA12 MP display elastic modulus of up to 1.49 GPa, the stresses at yield and break reaching 50 and 69 MPa, respectively. It is concluded that the neat, hybrid, and copolymeric pulverulent materials obtained via microencapsulation by AAROP in solution may be useful in additive manufacturing processing.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of neat, hybrid, and copolymeric polyamide 12 microparticles and composites on their basis

Dencheva

Braz

Denchev

2021

J of Applied Polymer Sci

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“…Figure 7 illustrates the FTIR spectra of PA12 samples for several polymerization conditions. Characteristic infrared bands and their physical meaning were interpreted based on previous studies 41–44 . As noted in Figure 7, the spectra of all samples are extremely similar between 4000 and 400 cm −1 , which is expected for PA12 44,45 …”

Section: Resultsmentioning

confidence: 79%

New perspectives on poly(lauryllactam) PA12: Optimization of process parameters for AROP of ω‐lauryllactam

Hamou,

Bruning,

LaPlante

et al. 2024

J of Applied Polymer Sci

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This study focuses on how catalyst concentration, activator concentration, and initial polymerization temperature impact in‐situ anionic ring‐opening polymerization (AROP) of ω‐lauryllactam. Catalyst and activator roles are fulfilled by NaH and toluene‐2,4‐diisocyanate (TDI), respectively, with varying catalyst/activator ratios to assess the influence of a bifunctional activator on the polymerization process. The materials produced undergo a thorough analysis, with a specific emphasis on solidification time. The examination extends to scrutinizing how different concentrations of catalyst/activator and polymerization temperatures affect crucial physical and chemical parameters. The study identifies NaH‐6 mol%/TDI‐3 mol% as the optimal formulation for solidification among the three explored temperatures. Notably, at 180 and 200°C, PA12 exhibits enhanced monomer conversion when a catalyst/activator ratio of 1.7 or 2 is applied. These findings underscore the significant impact of the catalyst/activator ratio and their individual concentrations on the polymer's final properties. This influence extends to factors such as crystallinity, polymer chain regularity, and dynamic mechanical properties. Additionally, the experimental conditions utilized for anionic polymerization are observed to shape the characteristics of PA12.

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“…When compared to other techniques, plasma‐based methods are characterized by very high flexibility and adaptivity of the process, [ 62 ] while thermochemical methods may be simpler and cheaper, requiring less complex equipment and control means. [ 63,64 ] In general, thermal processes involve mainly surface‐localized chemical and physical processes and reactions while the plasma‐based technology includes also a very complex set of processes in plasma [ 65,66 ] (ionization, [ 67 ] acceleration of ions by electric fields, [ 68 ] redistribution of ion fluxes by near‐surface electric fields, [ 69 ] charging the plasma‐immersed surfaces via electron fluxes, [ 70 ] and many others [ 71 ] ). Figure 2 presents a comparison of the processes near the surface during material synthesis using thermal and plasma‐based technologies.…”

Section: Plasma and Thermal Methods For Nanosynthesis: A General Comp...mentioning

confidence: 99%

Functional Nanomaterials from Waste and Low‐Value Natural Products: A Technological Approach Level

Levchenko

Mandhakini

Prasad

et al. 2022

Adv Materials Technologies

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Low‐ and negative‐value (waste) products represent a valuable resource. Its use as a source for the fabrication of high value materials represents a lucrative pathway to increasing sustainability and decreasing the economic cost of various industries. Thermochemical methods for the valorization of biowaste and low‐value natural products are simple and cheap yet sufficiently efficient to deliver significant economic benefits. Plasma‐based methods represent another family of technologies for waste‐to‐value conversion. The nanostructure nucleation and growth in plasmas involve a complex set of physical and chemical processes that occur in bulk plasma and on surfaces. The choice between these two types of technology assumes a complex optimization that takes into account several factors including the cost of precursors; initial outlay and operating cost of equipment; the cost of labor; the cost of production engineering including the research and development efforts for designing the industrial technology, which is typically higher for the plasma‐based systems, and so on. In this article a technology level comparison of thermochemical and plasma‐based techniques for the valorization of raw and waste biomass, where the intent is to use the resulting products for environmental remediation, energy storage, optoelectronics, and biomedical applications, is presented.

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Cover Picture: Plasma Process. Polym. 7/2018

Cited by 3 publications

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Synthesis and properties of neat, hybrid, and copolymeric polyamide 12 microparticles and composites on their basis

Synthesis and properties of neat, hybrid, and copolymeric polyamide 12 microparticles and composites on their basis

New perspectives on poly(lauryllactam) PA12: Optimization of process parameters for AROP of ω‐lauryllactam

Functional Nanomaterials from Waste and Low‐Value Natural Products: A Technological Approach Level

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