Halogenated sorbitol derivatives using as nucleating agent and their effect on orientation of polypropylene fiber

Authors

  • Thanita Sutthatang Department of Chemistry, Naresuan University
  • Supatra Wangsoub Department of Chemistry, Naresuan University
  • Uthai Wichai Department of Chemistry, Naresuan University

Keywords:

Fibril morphology, Sorbitol derivatives, Polypropylene, Nanostructure

Abstract

In this work, two halogenated derivatives of benzylidene sorbitol were synthesized by reacting D-sorbitol with an aromatic aldehyde in the present of an acid catalyst. ie.chloro and bromo derivatives for using as nucleating agent for polypropylene. For chloro derivative, different positions of substituent (ortho, meta and para) were also synthesised. SEM and TEM micrographs of gel extracted from organic solvent revealed long fibril network of chloro and bromo substitutes which their diameters are in the range of about 10-200 nm. Small amount (0.1-1%wt) of these materials was blended with isotactic polypropylene (iPP) by two roll mill machine and the mixture was made to fiber form by extrusion. It was found that these fibrils formed in polymer melt and shear flow during fiber preparation process. The effect of fiber preparation conditions such as die temperature, screw speed and crystallization rate on crystal orientation of polypropylene were studied. The effect of halogenated sorbitol derivatives on the crystallization of iPP were studied using different scanning calorimeter technique. It was found that 0.5 wt% of para chloro derivative show the most effective as a nucleating agent for iPP compared to the other substitution positions. The crystallization temperature of iPP containing 0.5 wt% of para chloro sorbitol increases up to 15% compared to the crystallization of neat PP. The para bromo shows less effective in an increasing the crystallization temperature when compared to the para chloro. No further increase in the crystallization temperature when the amounts of all derivatives are higher than 0.5%wt. It was found that the beta structure of iPP can be changed to alpha structure when small amount of sorbitol derivatives are presented below their solubility temperature.

Downloads

Download data is not yet available.

References

Keith, H. D., Padden, F. J., Walt, N. M. and Wyckoff, H. W. (1959). Evidence for a second crystal form of polypropylene. Jpn. J. Appl. Phys. 30 : 1485-1488.

Natta, G. and Porradini, P. (1960). Structure and properties of isotactic polypropylene. Nuovo Cimento, Suppl. 15 : 40-51.

Addink, E. J. and Beintema, J. (1961). Polymorphism of crystalline polypro-pylene. Polymer. 2 : 185-193.

Jones, A. T., Aizlewood, J. M. and Beckett, D. R. (1964). Crystalline form of isotacticpolypropylene. Makromolekulare Chemie. 75(1) : 134-158.

Beta nucleating masterbatch offers enhanced properties in polypropylene products. (2007). Online Available : http://www. mayzo.com/pdf/Beta-Nucleation-ArticlePlastics-Additives-Compounds.pdf.

Merurio, D. J. and Spontak, R. J. (2001). Morphological characteristics of 1,3:2,4- dibenzylidene sorbitol/poly (propylene glycol) organogels. J. Phys. Chem. B. 105(11) : 2091-2098.

Mahaffey, R. L. and Inman, Jr. S.C. (1981). Polyolefin plastic compositions comprising meta- or papa-derivatives (choro- or bromo-) of di-benzyuidene sorbitol. United States Patent 4371645.

Nagarajan, K., Levon, K. and Myerson, A.S. (2000). Nucleating agents in polypropylene. J. Therm. Anal. Cal. 59 : 497–508.

Shepard, T. A., Delsorbo, C. R., Louth, R. M., Walborn, J. L., Norman, D. A., Harvey, N. G. and Spontak, R. (1997). Self-organization and polyolefin nucleation efficacy of 1,3:2,4-di-p-methylbenzylidene sorbitol. J. Polym. Sci., Part B: Polym. Phys. 35(16) : 2617-2628.

Lipp, J., Shuster, M., Feldman, G. and Cohen, Y. (2008). Oriented Crystallization in Polypropylene Fibers Induced by a Sorbitol-based Nucleator. Macromolecules. 41 : 136-140.

Kristiansen, M., Werner, M., Tervoort, T. and Smith, P. (2003). The binary system isotactic polypropylene/bis(3,4-dimethyl-benzylidene) sorbitol : phase behavior, nucleation, and optical properties. Macromolecules. 36(14) : 5150-5156.

Somani, R. H., Yang, L. and Hsiao, B. S. (2005). Shear-induced molecular orientation and crystallization in isotactic polypropylene: effect of the deformation and strain. Macromolecules. 38(4) : 1244-1255.

Zhu, P., Tung, J., Phillips, A. and Edward, G. (2006). Morphological development of oriented isotactic polypropylene in the presence of a nucleating agent. Macromolecules. 39(5) : 1821-1831.

Chen, Y.H., Mao, Y.M., Li, Z.M. and Hsiao, B.S. (2010). Competitive growth of α- and β- crystals in β-nucleated isotactic polypropylene under shear flow. Macromolecules. 43(16) : 6760-6771.

Nogales, A., Blsiao, B. S., Somani, R. H., Srinivas, S., Tsou, A. H., Balta-Cellega, F.J. and Ezquerra , T.A. (2001). Shear-induced crystallization of isotactic polypropylene with different molecular weight distributions: in situ small- and wide-angle X-ray scattering studies. Polymer. 42(12) : 5247-5256.

Huo, H., Jaing, S., An, L. and Feng, J. (2004). Influence of shear on crystallization behavior of the ß phase in isotactic polypropylene with ß-nucleating agent. Macromolecules. 37 : 2478-2483.

Somani, R. H., Hsiao, B. S. and Nogales, A., Fruitwala, H., Srinivas, S. and Tsou, A.H. (2001). Structure development during shear flow induced crystallization of i-PP : in situ wide-angle X-ray diffraction study. Macromolecules. 34(17) : 5902-5909.

Kumaraswamy, G., Verm, R. K., Kornfield, J. A., Yeh, F. and Hsiao, B. S. (2004). Shear-enhanced crystallization in isotactic polypropylene : In-situ synchrotron SAXS and WAXD. Macromolecules. 37 : 9005-9017.

Downloads

Published

2013-06-30

How to Cite

[1]
T. Sutthatang, S. Wangsoub, and U. Wichai, “Halogenated sorbitol derivatives using as nucleating agent and their effect on orientation of polypropylene fiber”, J Met Mater Miner, vol. 23, no. 1, Jun. 2013.

Issue

Section

Original Research Articles