Effect of PP-g-LCP compatibilizer on the structure and crystallization of blends of isotactic polypropylene (PP) with a semiflexible liquid crystalline polymer (LCP)

Miteva, Tsenka; Minkova, L.

doi:10.1002/macp.1998.021990414

Cited by 3 publications

(3 citation statements)

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“…These findings show that a preexisting LC phase affects nucleation during crystallization of POE moiety and accelerates crystallization of POE, which is very similar to blends consisting of crystalline polymer/LC polymer. [48][49][50][51][52][53][54] Finally, ChEO10 was cooled from 160°C to a crystallization temperature (T c ) -14°C) with two thermal histories: (1) cooling at a constant rate of 100°C/min; (2) first cooling to 20°C at a rate of 10°C/min, held at 20°C for 5 min to form perfect LC phase, and finally cooled to -14°C. Figure 14 shows the Avrami plots for two crystallization conditions.…”

Section: Resultsmentioning

confidence: 99%

Competition of Crystalline and Liquid Crystalline Moieties in Self-Assembly of Poly(oxyethylene) Cholesterol Ethers

Xue

Fan

et al. 2006

Macromolecules

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Self-assembly of a series of poly(oxyethylene) (POE) cholesterol ethers (ChEOn, n ) 5, 10, 15, 20, 24, 30, and 45) bearing both liquid crystalline (LC) and crystalline moieties was studied by differential scanning calorimetry, wide-angle X-ray diffraction, Raman spectrometry, and small-angle X-ray scattering. In ChEO5 where POE is amorphous, the LC moiety was found to be dominant in determining morphology, and the repeating lamellar structure of ChEO5 is composed of double layers of cholesterol and a single layer of amorphous POE. In ChEO10 and ChEO15, LC and crystalline phases coexist and polymorphism is observed. The repeating lamellar structures of ChEO10 and ChEO15 are similar to that of ChEO5, except for the crystalline helical conformation of POE. With further increase in the chain length of POE, the crystalline POE becomes dominant in determining morphology, and the LC phase is not detected. The crystalline conformation of POE induces LC moieties to pack more closely, and the two LC layers gradually merge into a single LC layer in the repeating lamellar structure. Nonisothermal and isothermal crystallization experiments show that the preexisting LC phase can nucleate and accelerate POE crystallization, whereas the dimension of crystal growth of POE is reduced.

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Section: Resultsmentioning

confidence: 99%

Competition of Crystalline and Liquid Crystalline Moieties in Self-Assembly of Poly(oxyethylene) Cholesterol Ethers

Xue

Fan

et al. 2006

Macromolecules

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“…The compatibility improvement of the components in the blends, characterized by reduced interfacial energy, finer dispersions, stability against segregation, and increased adhesion [11], has been attempted in a number of studies. Maleic anhydride grafted, acrylic acid functionalized and LCP grafted polypropylene (PP) have been used to compatibilize several PP/LCP blends [6][7][8][9][11][12][13][14][15][16][17], as well as the similarly modified PEs, PE-LCP block and graft copolymers in compatibilization of PE/LCP mixtures [18][19][20]. In another approach, the LCP fibrillation was reported to have improved when silica fillers were introduced into the PP/LCP blend.…”

Section: Introductionmentioning

confidence: 97%

Reinforcement of high density polyethylene with a side chain LCP by graft copolymerization—thermal, mechanical and morphological properties

Soykan

Çetin

2015

J Polym Res

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In this study, high density polyethylene (PE) has been reinforced with a side chain LCP by graft copolymerization of p-benzophenoneoxycarbonylphenyl acrylate (BPOCPA). The mechanical and thermal behavior of the graft coproducts were investigated in relation to the structural changes (in unit cell parameters) of PE matrix. The crystalline melting temperature of PE, varying consistently with the poly(BPOCPA) content in the coproducts, significantly increased (from 131°C to 132-138°C). The unit cell dimensions, a and b, of the orthorhombic structure, the ab basal area and particle size of PE crystals initially expanded, and then consistently contracted with the graft content. The c parameter, however, remained relatively unchanged. Remarkable improvements were achieved in the tensile properties of the material; with the maxima of 38 % increase in tensile strength and 67 % increase in Young's modulus with the coproduct comprising 9.3 % poly(BPOCPA). These developments were found to be explained by the advances in the orientation and alignment of PE chains, conduced by greater chain mobility in the larger ab basal area and intensifying cohesive forces arising from the glassy nematic structured graft units.

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“…PP grafted with acrylic acid has been used as a compatibilizer for an LCP-containing sebacic acid, 4,4Ј-dihydroxybiphenyl and 4-hydroxybenzoic acid. 8 The potential problem of decreasing interfacial tension by addition of a third component is that the finer dispersion may be less fibrillar and thus less reinforcing, although most of the above research indicates that this is counteracted somewhat by improved adhesion.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and compatibilization of polypropylene-liquid crystalline polyester blends

Simon

Shanks

et al. 2000

J. Appl. Polym. Sci.

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Effect of PP-g-LCP compatibilizer on the structure and crystallization of blends of isotactic polypropylene (PP) with a semiflexible liquid crystalline polymer (LCP)

Cited by 3 publications

References 0 publications

Competition of Crystalline and Liquid Crystalline Moieties in Self-Assembly of Poly(oxyethylene) Cholesterol Ethers

Competition of Crystalline and Liquid Crystalline Moieties in Self-Assembly of Poly(oxyethylene) Cholesterol Ethers

Reinforcement of high density polyethylene with a side chain LCP by graft copolymerization—thermal, mechanical and morphological properties

Crystallization and compatibilization of polypropylene-liquid crystalline polyester blends

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