Single-Component Polymer Composites

Gürarslan, Alper; Tonelli, Alan E.

doi:10.1021/ma200530w

Cited by 20 publications

(48 citation statements)

References 18 publications

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“…Similar to Inoue et al we found (n-s)-nylon-6-CD-ICs to effectively nucleate the melt crystallization of neat bulk nylon-6, leading to improved mechanical properties [9,10]. We subsequently used such nucleated nylon-6 as the reinforcement for as-received nylon-6 matrices to form single polymer composites with necessarily compatible and strong interfaces [10]. In addition, the "shape-memory" of our (n-s)-nylon-6-CD-ICs was demonstrated by heating them above the melting temperatures (T m s) of the un-included nylon-6 chain portions, deforming and quenching the deformed sample, and finally reheating above T m and regaining the original un-deformed sample shape [9].…”

Section: Introductionsupporting

confidence: 83%

Section: Introductionsupporting

confidence: 67%

“…The methods used to form and characterize stoichiometric polymer-ICs made with CD and urea (U) hosts (see Figure 2) and (n-s)-polymer-CD-ICs have been described many times [8][9][10][11][12][13] and will not be repeated here. Instead we briefly describe the techniques and instruments used to probe the un-included portions of the guest chains in (n-s)-CD-ICs and polymer samples coalesced from their stoichiometric CD-and U-ICs.…”

Section: Methodsmentioning

confidence: 99%

“…Consequently, they, along with (n-s)-polymer-CD-ICs, may be used as effective self-nucleants [9][10][11][12][13]. Melt nucleation of as-received bulk polymers with small amounts of the same coalesced polymer has an important advantage over (n-s)-polymer-CD-ICs.…”

Section: Semi-crystalline Polymers In (N-s)-cd-ics and Coalesced Frommentioning

confidence: 99%

“…Our research group began to examine the formation, behaviors, and uses of (n-s)-polymer-CD-ICs [8][9][10][11][12][13] by forming them with both α-and γ-CD hosts and guest nylon-6 with different molecular weights obtained by anionic ring-opening polymerization of ε-caprolactam [8,9]. Similar to Inoue et al we found (n-s)-nylon-6-CD-ICs to effectively nucleate the melt crystallization of neat bulk nylon-6, leading to improved mechanical properties [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Non-Stoichiometric Polymer-Cyclodextrin Inclusion Compounds: Constraints Placed on Un-Included Chain Portions Tethered at Both Ends and Their Relation to Polymer Brushes

Tonelli

2014

Polymers

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When non-covalently bonded crystalline inclusion compounds (ICs) are formed by threading the host cyclic starches, cyclodextrins (CDs), onto guest polymer chains, and excess polymer is employed, non-stoichiometric (n-s)-polymer-CD-ICs, with partially uncovered and "dangling" chains result. The crystalline host CD lattice is stable to ~300 °C, and the uncovered, yet constrained, portions of the guest chains emanating from the CD-IC crystal surfaces behave very distinctly from their neat bulk samples. In CD-IC crystals formed with α-and γ-CD hosts, each containing, respectively, six and eight 1,4-α-linked glucose units, the channels constraining the threaded portions of the guest polymer chains are ~0.5 and 1.0 nm in diameter and are separated by ~1.4 and 1.7 nm. This results in dense brushes with ~0.6 and 0.4 chains/nm 2 (or 0.8 if two guest chains are included in each γ-CD channel) of the un-included portions of guest polymers emanating from the host CD-IC crystal surfaces. In addition, at least some of the guest chains leaving from a crystalline CD-IC surface re-enter another CD-IC crystal creating a network structure that leads to shape-memory behavior for (n-s)-polymer-CD-ICs. To some extent, (n-s)-polymer-CD-ICs can be considered as dense polymer brushes with chains that are tethered on both ends. Not surprisingly, the behavior of the un-included portions of the guest polymer chains in (n-s)-polymer-CD-ICs are quite different from those of their neat bulk samples, with higher glass-transition and melt crystallization temperatures and crystallinities. Here we additionally compare their behaviors to samples coalesced from their stoichiometric ICs, and more importantly to dense polymer brushes formed by polymer chains chemically bonded to surfaces at only one end. Judging on the basis of their glass-transition, crystallization and melting temperatures, and crystallinities, we generally find the un-included portions of OPEN ACCESSPolymers 2014, 6 2167 chains in (n-s)-polymer-CD-ICs to be more constrained than those in neat bulk as-received and coalesced samples and in high density brushes. The last observation is likely because many of the un-included chain portions in (n-s)-polymer-CD-ICs are tethered/constrained at both ends, while the chains in their dense brushes are tethered at only one end.

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Section: Introductionsupporting

confidence: 83%

Section: Introductionsupporting

confidence: 67%

Section: Methodsmentioning

confidence: 99%

Section: Semi-crystalline Polymers In (N-s)-cd-ics and Coalesced Frommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Stoichiometric Polymer-Cyclodextrin Inclusion Compounds: Constraints Placed on Un-Included Chain Portions Tethered at Both Ends and Their Relation to Polymer Brushes

Tonelli

2014

Polymers

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Preparation of polypropylene single‐polymer composites by injection molding

Jian

Mao

Chen

2013

J of Applied Polymer Sci

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The hot compaction process is still the principle method to produce single-polymer composites (SPCs) at present, which limits the industrial mass production of SPCs. In this article, an approach of preparing SPCs by injection molding was demonstrated. Polypropylene (PP) SPCs were prepared at different temperature and pressure. The flexural properties of the PP SPCs were tested. The optimum processing parameters, injection pressure of 140 MPa and nozzle temperature of 220 C were obtained. Flexural strength of the PP SPCs reached up to 43.3 MPa, which is 54.2% higher than that of nonreinforced PP. Flexural strength can be promoted by raising the injection pressure and nozzle temperature. The morphology of the fibers in the PP SPCs was investigated by optical microscope and scanning electron microscopy techniques. The matrix melt was able to penetrate into fiber webs under appropriate temperature and pressure, good interfacial compatibility and bonding properties were obtained. As the injection and holding pressure increased, the penetration capacity could be improved and the arrangement of fibers tended to be closer.

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Improving Poly(ethylene terephthalate) Through Self‐nucleation

Joijode

Hawkins

Tonelli

2013

Macro Materials & Eng

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As‐received poly(ethylene terephthalate) (asr‐PET) may be reorganized by precipitation from trifluoroacetic acid upon gradual addition to a large excess of rapidly stirred acetone (p‐PET). Unlike asr‐PET, p‐PET repeatedly crystallizes rapidly from the melt, and can be used in small quantities (a few %) as an effective self‐nucleating agent to control and improve the bulk semi‐crystalline morphology and properties of asr‐PET. Nuc‐PET film has significantly increased hardness and Young's modulus and is much less permeable to CO2, while its un‐drawn fibers exhibit higher tenacities and moduli. Because nuc‐PET contains no incompatible additives, it may be readily recycled.

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Single-Component Polymer Composites

Cited by 20 publications

References 18 publications

Non-Stoichiometric Polymer-Cyclodextrin Inclusion Compounds: Constraints Placed on Un-Included Chain Portions Tethered at Both Ends and Their Relation to Polymer Brushes

Non-Stoichiometric Polymer-Cyclodextrin Inclusion Compounds: Constraints Placed on Un-Included Chain Portions Tethered at Both Ends and Their Relation to Polymer Brushes

Preparation of polypropylene single‐polymer composites by injection molding

Improving Poly(ethylene terephthalate) Through Self‐nucleation

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