The effect of unidirectional shear flow-induced orientation on foaming properties of polypropylene
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Yun Zhang
Abstract
When the semi-crystalline polymers undergo shearing during flow, the orientation of the molecular chains are induced. In order to study the effect of polypropylene orientation on foaming, we designed an injection mold with a long flow ratio. The samples were prepared by different process conditions and characterized by polarized Fourier transform infrared spectroscopy (FTIR). The degree of orientation was calculated by infrared dichroism. It was found that the orientation of the amorphous region has the greatest influence, and the subsurface layer in the cross section along the flow direction had the largest degree of orientation. The samples were foaming in a self-made sealed cavity under the same condition. The foamed samples were observed by scanning electron microscopy, and it was found that the shish-kebab crystal structure was induced in the surface layer and the subsurface layer under strong shear force. The shish-kebab crystal structure restricted the space for bubble nucleation and growth, and a large number of sub-micron and nano-scale cells appeared in the space of nucleation and growth. Along the flow orientation direction, the longitudinal and transverse sections of each foamed sample with the degree of orientation decreases, the density of cells and the average diameter of cells increases gradually, and the expansion of the foams have an advantage in the direction of flow orientation. The degree of orientation corresponding to the amorphous ribbon (1153 cm−1) of all the samples were arranged from small to large, and it was found that the expansion ratio decreased when the degree of orientation increased. The effect of orientation on foaming properties of polypropylene provides a new strategy for designing other polymer foams.
Funding: This work was financially supported by a grant from the National Key Research and Development Program of China (no. 2016YFB0302203).
References
[1] Okolieocha C, Raps D, Subramaniam K, Altstädt V. Eur. Polym. J. 2015, 73, 500–519.10.1016/j.eurpolymj.2015.11.001Search in Google Scholar
[2] Tadmor ZJ. Appl. Polym. Sci. 2010, 18, 1753–1772.10.1002/app.1974.070180614Search in Google Scholar
[3] Mendoza R, Régnier G, Seiler W, Lebrun JL. Polymer 2003, 44, 3363–3373.10.1016/S0032-3861(03)00253-2Search in Google Scholar
[4] Patcharaphun S, Mennig G. Polym.-Plast. Technol. Eng. 2006, 45, 759–768.10.1080/03602550600611651Search in Google Scholar
[5] Guo J, Huang B. Eng. Plast. Appl. 2003, 31, 25–28.10.1002/fors.200390015Search in Google Scholar
[6] Ozcelik B, Ozbay A, Demirbas E. Int. Commun. Heat Mass 2010, 37, 1359–1365.10.1016/j.icheatmasstransfer.2010.07.001Search in Google Scholar
[7] SadAbadi H, Ghasemi MJ. Reinf. Plast. Comp. 2007, 26, 1729–1741.10.1177/0731684407081352Search in Google Scholar
[8] Tiusanen J, Vlasveld D, Vuorinen J. Compos. Sci. Technol. 2012, 72, 1741–1752.10.1016/j.compscitech.2012.07.009Search in Google Scholar
[9] Fujiwara Y, Goto T, Yamashita Y. Polymer 1987, 28, 1253–1256.10.1016/0032-3861(87)90433-2Search in Google Scholar
[10] Pawlak A, Piorkowska E. Colloid Polym. Sci. 2001, 279, 939–946.10.1007/s003960100519Search in Google Scholar
[11] Liu F, Chao G, Xian W, Qian X, Liu H, Zhang J. Polym. Adv. Technol. 2012, 23, 686–694.10.1002/pat.1946Search in Google Scholar
[12] Kantz MR, Newman HD, Stigale FH. J. Appl. Polym. Sci. 1972, 16, 1249–1260.10.1002/app.1972.070160516Search in Google Scholar
[13] Fitchmun DR, Mencik Z. J. Polym. Sci. Polym. Phys. 1973, 11, 951–971.10.1002/pol.1973.180110512Search in Google Scholar
[14] Housmans JW, Gahleitner M, Peters GWM, Meijer HEH. Polymer 2009, 50, 2304–2319.10.1016/j.polymer.2009.02.050Search in Google Scholar
[15] Katti SS, Schultz M. Polym. Eng. Sci. 1982, 22, 1001–1017.10.1002/pen.760221602Search in Google Scholar
[16] Giboz J, Copponnex T, Mélé PJ. Micromech. Microeng. 2009, 19, 025023.10.1088/0960-1317/19/2/025023Search in Google Scholar
[17] Porter D. J. Non-Newton. Fluid 1997, 68, 141–152.10.1016/S0377-0257(96)01516-9Search in Google Scholar
[18] Samuels RJ. Macromol. Chem. Phys. 1981, 4, 241–270.10.1002/macp.1981.020041981117Search in Google Scholar
[19] Custódio FJMF, Steenbakkers RJA, Anderson PD, Peters GWM, Meijer HEH. Macromol. Theor. Simul. 2009, 18, 469–494.10.1002/mats.200900016Search in Google Scholar
[20] Xuan Y, Yong X. Polym. Mater. Sci. Eng. 2017, 32, 112–117.Search in Google Scholar
[21] Xuan Y, Yong X. Mater. Rep. 2018, 32, 327–332.Search in Google Scholar
[22] Lotz B. Polymer 1998, 39, 4561–4567.10.1016/S0032-3861(97)10147-1Search in Google Scholar
[23] Zhang J, Guo C, Wu X, Liu FH, Qian XY. J. Macromol. Sci. B 2011, 50, 15.10.1080/00222348.2011.562839Search in Google Scholar
[24] Lee ST. Polym. Eng. Sci. 1993, 33, 418–422.10.1002/pen.760330707Search in Google Scholar
[25] Ogino Y, Fukushima H, Takahashi N, Matsuba G, Nishida K, Kanaya T. Macromolecules 2006, 39, 7617–7625.10.1021/ma061254tSearch in Google Scholar
[26] Hsiao BS, Yang L, Somani RH, Avila-Orta CA, Zhu L. Phys. Rev. Lett. 2005, 94, 117802.10.1103/PhysRevLett.94.117802Search in Google Scholar PubMed
[27] Bao JB, Liu T, Zhao L, Barth D, Hu G-H. Ind. Eng. Chem. Res. 2011, 50, 13387–13395.10.1021/ie2018228Search in Google Scholar
[28] Lee J, Kim J, Hyeon T. Adv. Mater. 2006, 18, 2073–2094.10.1002/adma.200501576Search in Google Scholar
[29] Rouquerol J, Avnir D, Fairbridge CW, Everett DH, Haynes JM, Pernicone N, Ramsay JDF, Sing KSW, Unger KK. Pure Appl. Chem. 1994, 66, 1739–1758.10.1351/pac199466081739Search in Google Scholar
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Articles in the same Issue
- Frontmatter
- Material properties
- The effect of unidirectional shear flow-induced orientation on foaming properties of polypropylene
- An investigation on electro-induced shape memory performances of CE/EP/CB/SCF composites applied for deployable structure
- Nanocomposite film with green synthesized TiO2 nanoparticles and hydrophobic polydimethylsiloxane polymer: synthesis, characterization, and antibacterial test
- Preparation and assembly
- Binary solvent systems for durable self-adhesive conductive hydrogels
- Development of surface properties of ultra-high-molecular-weight polyethylene film using side-chain crystalline block copolymers
- Highly porous, fast responding acrylamide hydrogels through emulsion polymerization using coconut oil
- Engineering and processing
- Multizone barrel temperature control of the eccentric rotor extrusion process
- The influence of mold temperature on thermoset in-mold forming
- Innovative γ rays irradiated styrene butadiene rubber/reclaimed waste tire rubber blends: a comparative study using mechano-chemical and microwave devulcanizing methods
- Experimental study on influence of molding parameters on self-reinforcement characteristics of polymer co-injection molding
Articles in the same Issue
- Frontmatter
- Material properties
- The effect of unidirectional shear flow-induced orientation on foaming properties of polypropylene
- An investigation on electro-induced shape memory performances of CE/EP/CB/SCF composites applied for deployable structure
- Nanocomposite film with green synthesized TiO2 nanoparticles and hydrophobic polydimethylsiloxane polymer: synthesis, characterization, and antibacterial test
- Preparation and assembly
- Binary solvent systems for durable self-adhesive conductive hydrogels
- Development of surface properties of ultra-high-molecular-weight polyethylene film using side-chain crystalline block copolymers
- Highly porous, fast responding acrylamide hydrogels through emulsion polymerization using coconut oil
- Engineering and processing
- Multizone barrel temperature control of the eccentric rotor extrusion process
- The influence of mold temperature on thermoset in-mold forming
- Innovative γ rays irradiated styrene butadiene rubber/reclaimed waste tire rubber blends: a comparative study using mechano-chemical and microwave devulcanizing methods
- Experimental study on influence of molding parameters on self-reinforcement characteristics of polymer co-injection molding
