Effect of melting temperature on interfacial interaction and mechanical properties of polypropylene (PP) fiber reinforced olefin block copolymers (OBCs)

Li, Zhen; Shi, Yunjie; Liu, Huili; Chen, Feng; Zhang, Qin; Wang, Ke; Fu, Qiang

doi:10.1039/c4ra06548d

Cited by 18 publications

(12 citation statements)

References 60 publications

(68 reference statements)

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“…This relationship is in accord with the general tendency that meltingp oints of organic compounds become higher when intermoleculara ttractivef orces, such as those arising from bonding orbitali nteractions, becomelarger in crystals. [51][52][53][54] Thus, the relationship suggestst hat intermolecular orbital interactions elongate l FL,C of 1a-gBF 2 .N ote that the S 0 -S 1 electronic transitions in the molecular arrays of 1fBF 2 and 1gBF 2 do not contribute to the FL emission because they are forbidden.T hus, other allowed S 0 -S n transitions are involved in FL emission of 1fBF 2 and 1gBF 2 . In fact, meltingp oints and experimentallyd etermined energies for fluorescencee mission of 1a-gBF 2 in crystals( E FL,C ), which were calculated from l FL,C ,a lso show linear relationships, except in the cases of 1fBF 2 and 1gBF 2 (Figure 8b).…”

Section: Packing-structure-dependent Fl Propertieso Fcrystalsmentioning

confidence: 95%

New Fluorescence Domain “Excited Multimer” Formed upon Photoexcitation of Continuously Stacked Diaroylmethanatoboron Difluoride Molecules with Fused π‐Orbitals in Crystals

Sakai

Ohta

Yoshimoto

et al. 2015

Chemistry A European J

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The crystal-packing structures of seven derivatives of diaroylmethanatoboron difluoride (1 a-gBF2 ) are characterized by no overlap of the π-conjugated main units of two adjacent molecules (type I), overlap of the benzene ring π-orbitals of two adjacent molecules (type II), and overlap of the benzene and dihydrodioxaborinine rings π-orbitals of adjacent molecules (type III). The crystal-packing structures govern the fluorescence (FL) properties in the crystalline states. The FL domain that is present in type I crystals, in which intermolecular orbital interactions are absent, leads to excited monomer-like FL properties. In the case of the type II crystals, the presence of intermolecular overlap of the benzene rings π-orbitals generates new FL domains, referred to as "excited multimers", which possess allowed S0 -S1 electronic transitions and, as a result, similar FL lifetimes at longer wavelengths than the FL of the type I crystals. Finally, intermolecular overlap of the benzene and dihydrodioxaborinine ring π-orbitals in the type III crystals leads to "excited multimer" domains with forbidden S0 -S1 electronic transitions and longer FL lifetimes at similar wavelengths as that in type I crystals.

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Section: Packing-structure-dependent Fl Propertieso Fcrystalsmentioning

confidence: 95%

New Fluorescence Domain “Excited Multimer” Formed upon Photoexcitation of Continuously Stacked Diaroylmethanatoboron Difluoride Molecules with Fused π‐Orbitals in Crystals

Sakai

Ohta

Yoshimoto

et al. 2015

Chemistry A European J

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“…For example, OBCs with different block architectures during uniaxial deformation were investigated and it was found that longer but fewer hard blocks in the OBCs resulted in fewer folded-chain lamellar crystals, a less effective network and an easier break, especially at high temperatures. 16 From the viewpoint of optimization of properties, there have been reports on enhanced mechanical strength via blending, 17 ber reinforcing [18][19][20] and ller reinforcing. 15 Furthermore, the structure and properties of OBCs can also be inuenced by external elds such as processing temperature and shear ow.…”

Section: Introductionmentioning

confidence: 99%

The effect of hard block content on the orientation and mechanical properties of olefin block copolymer films as obtainedviamelt stretching

et al. 2015

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In this study, the orientation, structure and mechanical performance of a series of uniaxially oriented films based on olefin block copolymers (OBC) have been investigated in terms of the differences in hard block content and draw ratio (DR). Three OBCs with different hard block contents of 35 wt%, 25 wt% and 12 wt% were used. For un-stretched films, a change from close-packed spherulites into tiny crystallites is observed with decreasing hard block content, accompanied by an almost linear decrease in crystallinity.However, the change in mechanical properties does not follow the same path, with obviously higher tensile strength and modulus for OBC-35, but a lower and almost the same tensile strength and modulus for OBC-25 and OBC-12, in spite of the big difference in hard block content and crystallinity between them. For melt-stretched films, the degree of orientation of the amorphous phase is almost the same and slightly increases with the increase in the draw ratio for the three OBCs, disregarding their hard block contents. Crystalline orientation and shish content are much higher for OBC-35, and an obvious increase is seen as the draw ratio increases from 4.95 to 8, corresponding to the sharp increase in Young's modulus and stress. For OBC-25 and OBC-12, similar crystalline orientation and shish content are seen, which increase linearly with draw ratio and are consistent with the linear increase in modulus and stress as the draw ratio increases. Our study demonstrates the importance of the hard block content of OBC to determine the mechanical properties and the response to external stretching. A critical hard block content exists (in this case 35 wt%), above which a strong network is constructed by the hard block crystalline phase, resulting in a higher tensile strength and modulus. This strong network is destroyed as the draw ratio reaches a certain value (herein, 4.95 to 8), leading to an obvious increase in crystalline orientation, as well as a sharp increase in tensile strength and modulus. When the hard block is below the critical content (herein, 25 wt% and 12 wt%), the network constructed by the hard block is weak and less dependent on its content.

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“…The interface between the resin matrix and fiber is one of the important factors that decide the final mechanical properties of polymer/fiber composites. Here, the surface tensions of copolymers PPS‐NH 2 and GF were calculated from the following equation:

γ_{l} true(1 + cos θ true) = 2 \sqrt{γ_{normals}^{d} γ_{normall}^{d}} + 2 \sqrt{γ_{normall}^{p}}; γ_{normall}^{d} + r_{normall}^{p}; γ_{s} = γ_{normals}^{d} + γ_{normals}^{p}

where

γ_{normall}

is surface tension of standard solution,

γ_{s}

is surface tension of solid. θ is contact angle,

γ_{s}^{d}

and

γ_{s}^{p}

are the disperse part and polar part of solid, respectively,

γ_{l}^{d}

and

γ_{l}^{p}

are the disperse part and polar part of standard solution, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of polyphenylene sulfide containing amino unit on thermal and mechanical properties of polyphenylene sulfide/glass fiber composites

Ren

Xu²,

et al. 2017

J of Applied Polymer Sci

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Three kinds of high-molecular-weight compatibilizers [copoly(1,4-phenylene sulfide)-poly(2,5-phenylene sulfide amine)] (PPS-NH 2 ) containing different proportions of amino units in the side chain) were synthesized by the reaction of dihalogenated monomer and sodium sulfide via nucleophilic substitution polymerization under high pressure. The intrinsic viscosity of the obtained copolymers was 0.354-0.489 dL/g and they were found to have good thermal performance with melting point (T m ) of 271.3-281.0 8C and initial degradation temperature (T d ) of 490.0-495.7 8C. There was an excellent physical compatibility between PPS-NH 2 and the pure industrial PPS. The results of dynamic mechanical analysis and macro-and micromechanical test showed that the selective compatibilizer PPS-NH 2 (1.0) (1.0% mol aminated ratio) can improve the mechanical and interfacial properties of polyphenylene sulfide/ glass fiber (PPS/GF) composite. The macro-optimal tensile strength, Young's modulus, bending strength, and notched impact strength of 5%PPS-NH 2 (1.0)/PPS/GF composite raised up to 141 MPa, 1.98 GPa, 203 MPa, and 6.15 kJ/m 2 , which increased 12.8%, 9.4%, 4.1%, and 13.8%, respectively, comparing with the pure PPS/GF composite (125 MPa, 1.81 GPa, 195 MPa, and 5.40 kJ/m 2 , respectively).

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Effect of melting temperature on interfacial interaction and mechanical properties of polypropylene (PP) fiber reinforced olefin block copolymers (OBCs)

Abstract: Transcrystalline structures for the first time were observed at the interface of OBC/PP fiber, proving that the partially melted (170 °C) and totally melted (190 °C) PP fibers have stronger interactions with OBC than unmelted PP fibers does.

Cited by 18 publications

References 60 publications

New Fluorescence Domain “Excited Multimer” Formed upon Photoexcitation of Continuously Stacked Diaroylmethanatoboron Difluoride Molecules with Fused π‐Orbitals in Crystals

New Fluorescence Domain “Excited Multimer” Formed upon Photoexcitation of Continuously Stacked Diaroylmethanatoboron Difluoride Molecules with Fused π‐Orbitals in Crystals

The effect of hard block content on the orientation and mechanical properties of olefin block copolymer films as obtainedviamelt stretching

Effect of polyphenylene sulfide containing amino unit on thermal and mechanical properties of polyphenylene sulfide/glass fiber composites

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