Some observations on transitions in aliphatic polymaides

Northolt, M. G.; Tabor, B.J.; Aartsen, J. J. Van

doi:10.1007/bfb0117190

Cited by 15 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 3, that can be sure by X-ray diffraction experiments that nylon 12 raw material is indeed in the form of γ-phase, its diffraction peak at (001) crystal plane and (200) crystal plane is consistent with the reported in the literature [5,6].…”

Section: Lattice Parameter and Crystallinity Change Of Materials Duri...supporting

confidence: 87%

Internal Structure Changes of Nylon 12 in Balloon Forming Process

et al. 2014

AMM

View full text Add to dashboard Cite

Medical balloon has been widely used for the treatment of cardiovascular and cerebrovascular diseases, but the theoretical studies in processing process of medical balloon have reported less in the domestic. This paper briefly introduce in the processing process of medical balloon from the nylon 12 as raw materials, through control the conditions of primary molding, secondary molding and final molding process of the operating, then investigate the stress-strain curve of each sample in the molding process by Hydraulic Pressure Tester. And further investigated the material's lattice parameter, melting point, crystallinity and the structure changes of internal groups during the molding process separately by X-ray diffraction (XRD), differential scanning caborimetry (DSC) and infrared transmission spectroscopy (FTIR) experiment. It could be founded that the acting force between the polymeric chain of nylon 12 reduced at first, so that the material has better plasticity and machinability for forming, and then the acting force of polymer chain is enhanced, so that the final balloon has higher strength and stability were discovered during the balloon forming process.

show abstract

Section: Lattice Parameter and Crystallinity Change Of Materials Duri...supporting

confidence: 87%

Internal Structure Changes of Nylon 12 in Balloon Forming Process

et al. 2014

AMM

View full text Add to dashboard Cite

show abstract

“…WAXD patterns for POSS and PA 12/POSS composites with various POSS contents are shown in Figure 1. PA 12 itself displays two reflections at 2θ = 5.5° and 21.3° corresponding to the (200) and (001) planes of pseudo‐hexagonal γ‐form crystals, respectively 27, 28. No new crystalline structure or crystal transformation was observed in PA 12/POSS composites with POSS content from 0.5 to 1 wt %, which indicates that the presence of low loading of POSS did not influence the crystalline structures of the melt‐crystallized PA 12 samples.…”

Section: Resultsmentioning

confidence: 99%

“…The Amide II band at 1560 cm −1 reflects the γ‐form in PA 1227–29 [Fig. 3 (b)], which moves to a lower frequency region with the intensity decreasing, as temperature increases.…”

Section: Resultsmentioning

confidence: 99%

Effect of POSS on crystalline transitions and physical properties of polyamide 12

Wan

Zhao

Bao

et al. 2008

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Polyamide 12/Trisilanolphenyl‐POSS (PA 12/POSS) composites were prepared via melt‐compounding. The effect of polyhedral oligomeric silsesquioxane (POSS) on crystalline structure and crystalline transition of PA 12 was investigated by wide‐angle X‐ray diffraction (WAXD) and real time fourier transform infrared spectroscopy (FTIR). WAXD results indicated that PA 12 crystallized into γ‐form as slowly cooling from melt and the presence of POSS did not influence the crystalline structure of PA 12. Both PA 12 and PA 12/POSS composites underwent Brill transitions when they were heated from room temperature to melt point. Real time FTIR patterns showed that an absorption band at 697 cm−1 ascribed to Amide V (α) mode was emerged along with the disappearance of Amide VI (γ) band at 628 cm−1 with the increase of the temperature for PA 12 and PA 12/POSS composites, which suggested that the γ‐form crystalline has transformed into α form. The Brill bands were identified and the transformed mechanism was discussed based on the real FTIR results. The addition of POSS enhanced the tensile strength and thermal stability of PA 12. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 121–129, 2009

show abstract

Glass transition in polyesteramides

Akçatel

Jasse

1978

J. Polym. Sci. Polym. Chem. Ed.

View full text Add to dashboard Cite

The glass transition of three different polyesteramides, polyundecanamide‐undecanoates, polyundecanamide‐nonanoates, and polyundecanamide–p‐methylbenzoates has been investigated by differential thermal analyses. As the amino acid content in the polymer increases, the evolution of the glass transition temperature is strongly influenced by the comparative length and the stiffness of the two monomer units. The experimental data are discussed in terms of the disruption of a hydrogen‐bonded network in the amorphous regions of the copolymers.

show abstract

Some observations on transitions in aliphatic polymaides

Cited by 15 publications

References 8 publications

Internal Structure Changes of Nylon 12 in Balloon Forming Process

Internal Structure Changes of Nylon 12 in Balloon Forming Process

Effect of POSS on crystalline transitions and physical properties of polyamide 12

Glass transition in polyesteramides

Contact Info

Product

Resources

About