Structural Matching between the Polymeric Nucleating Agent Isotactic Poly(vinylcyclohexane) and Isotactic Polypropylene

Alcazar, Daniel; Ruan, Jrjeng; Thierry, A.; Lotz, Bernard

doi:10.1021/ma052651r

Cited by 55 publications

(45 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The periodicity matching between 6.5 and 6.6 Å was found in other α‐nucleating agents and iPP. Alcazar et al found that the polyvinylcyclohexane (PVCH) shared the same chain axis ( c ‐axis) repeat (≈ 6.5 Å) with iPP, and repeat distances normal to the chain axis were ≈ 21.9 Å for the (110) face of the α‐iPP and the (100) face of PVCH 33. Yoshimoto et al found that the b ‐axis dimension of sodium 2,2′‐methylene‐bis(4,6‐di‐ t ‐butylphenylene) phosphate (NA‐11) was very close to the c ‐axis dimension of iPP (≈ 6.5 Å), and further the a ‐axis dimension of the NA‐11 was about four times of the a value of iPP 34.…”

Section: Resultsmentioning

confidence: 99%

Crystal structure and morphologies of polypropylene homopolymer and propylene‐ethylene random copolymer: Effect of the substituted 1,3,5‐benzenetrisamides

Wang¹,

Dou²,

Chen³

et al. 2008

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Four different substituted 1,3,5‐benzenetrisamides were synthesized and two of them were reported for the first time. Their effects on the crystal structure and morphologies of the iPP homopolymer (PPH) and propylene‐ethylene random copolymers (PPR) were investigated. The results showed that they had versatile nucleating ability among the different crystal forms of PPH. The N,N′,N′′‐tris‐tert‐butyl‐1,3,5‐benzene‐tricarboxamide, N,N′,N′′‐tris‐cyclohexyl‐1,3,5‐benzene‐tricarboxamide, and N,N′,N′′‐tris‐isopropyl‐1,3,5‐benzene‐tricarboxamide suppressed the formation of detectable spherulites with the common α‐form of the PPH, as well as the N,N′,N′′‐n‐butyl‐1,3,5‐benzene‐tricarboxamide induced the spherulites of the β‐form. The combination of the ethylene segment and the nucleating agent facilitated the formation of the γ‐form. These trisamides had limited effects on the packing of the PPH segments but induced more compacted packing of the PPRs. The nucleation mechanism of such compounds was discussed for the first time, it was found that the nucleation ability of these compounds rooted in matching of their dimension of the b‐axis with dimension of the c‐axis of iPP, and their butterfly‐shape further enhanced it. The (001) face of the trisamides was in contact with the (010) face of iPP. This epitaxial crystallization led to preferential growth along the b‐axis, and the ethylene segment indeed enhanced this effect. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1067–1078, 2008

show abstract

Section: Resultsmentioning

confidence: 99%

Crystal structure and morphologies of polypropylene homopolymer and propylene‐ethylene random copolymer: Effect of the substituted 1,3,5‐benzenetrisamides

Wang¹,

Dou²,

Chen³

et al. 2008

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

show abstract

“…123 (B) schematic lattice matching (from Ref. 124 reproduced with permission from American Chemical Society, 2018) and crystal lattice parameters (from 107,125)…”

Section: Additive‐ and Blend‐based Modificationsmentioning

confidence: 99%

Designing polymer crystallinity: An industrial perspective

Mileva

Tranchida

Gahleitner

2018

Polymer Crystallization

View full text Add to dashboard Cite

More than 50% of the thermoplastic polymers applied globally are semi‐crystalline, making crystallization part of the material and component design process for these materials. The mechanical and optical performance, but also the long‐term stability of the final articles and applications will depend upon three major groups of influence factors: Polymer structure and monomer composition, additive addition (especially nucleation) and blending with secondary components, and processing parameters. In the present review, we try to establish a connection between these three areas, the resulting combination of crystallinity and morphology, and the final application properties. Examples are drawn from the two major polyolefins, polyethylene and polypropylene, technical polymers like polyamide and polyester, but also polymers from renewable sources like poly(lactic acid).

show abstract

“…When the epitaxy involves two polymers with helical conformation, the tilts of the helical paths (defined as the pitch angle) can be either additive or, occasionally, compensate each other. The latter situation is found for the iPP/isotactic polyvinylcyclohexane (iPVCH, a polymeric nucleating agent for iPP) . Dimensional and structural matching is linked with the fact that the two helices have identical c ‐axis repeat distances and the tilt of the rows of side chains is similar for the two polymers: cyclohexyls in the (100) iPVCH and methyls in the (110) iPP contact planes, respectively …”

mentioning

confidence: 98%

Oriented Overgrowths of Poly(l‐Lactide) on Oriented Isotactic Polypropylene: A Sequence of Soft and Hard Epitaxies

Guan

Zhang

Sun

et al. 2018

Macromol. Rapid Commun.

Self Cite

View full text Add to dashboard Cite

The crystallization behavior of an amorphous poly(l-lactide) (PLLA) layer deposited on uniaxially oriented isotactic polypropylene (iPP) substrate is been studied by atomic force microscopy (AFM) and electron microscopy combined with electron diffraction. A patterned PLLA structure with two fixed lamella and chain orientations is observed. Electron diffraction demonstrates that the major lamellar set is oriented with molecular chains perpendicular to the chain direction of the iPP. The minor lamellar set is inclined at ≈64° to both the iPP chain axis direction and the lamellae of the major set as judged from both the bright field electron micrograph and the AFM image. The orientation of the main set is explained in terms of "soft" epitaxy or graphoepitaxy, in which PLLA chains oriented parallel to the ditches of the iPP substrate caused by alternatively arranged crystalline and amorphous regions. The minor set is due to a homoepitaxy of PLLA with parallelism of the helical paths. The orientation of this minor set of lamellae therefore depends on and can help determine the chirality-l or d-of the PLA investigated.

show abstract

Structural Matching between the Polymeric Nucleating Agent Isotactic Poly(vinylcyclohexane) and Isotactic Polypropylene

Cited by 55 publications

References 16 publications

Crystal structure and morphologies of polypropylene homopolymer and propylene‐ethylene random copolymer: Effect of the substituted 1,3,5‐benzenetrisamides

Crystal structure and morphologies of polypropylene homopolymer and propylene‐ethylene random copolymer: Effect of the substituted 1,3,5‐benzenetrisamides

Designing polymer crystallinity: An industrial perspective

Oriented Overgrowths of Poly(l‐Lactide) on Oriented Isotactic Polypropylene: A Sequence of Soft and Hard Epitaxies

Contact Info

Product

Resources

About