The Use of an In-Situ Measurement to Probe the Solidification Kinetics of Injection-Molded HDPE/PP Blends
DOI:
https://doi.org/10.6000/1929-5995.2013.02.01.1Keywords:
Solidification Kinetics, Crystallization, Injection Molding, Temperature Profile, BlendAbstract
The largest portion of an injection molding (IM) cycle is actually occupied by the melt cooling stage, which also significantly dictates many end-use properties of the final parts, especially for crystalline polymers which undergo both solidification and crystallization processes simultaneously. The solidification kinetics of HDPE/PP blends were investigated under injection molding conditions with the aid of an in-situ measurement of in-cavity temperature profiles throughout the IM process. The obtained experimental results were in good agreement with our previous theoretical predictions. The present study will be instructive to the optimization of processing variables, and supplies good insight into the formation of various crystalline structures in injection-molded articles.
References
Cao Y, Faghri A, Chang WS. A numerical analysis of Stefan problems for generalized multidimensional phase-change structures using the enthalpy transforming model. Int J Heat Mass Transfer 1989; 32: 1289-98. http://dx.doi.org/10.1016/0017-9310(89)90029-X DOI: https://doi.org/10.1016/0017-9310(89)90029-X
Yan B, Li Y, Kong XA, et al. Three-dimensional numerical simulation of polymer crystallization during plastic injection molding. Acta Polym Sin 2011; 2: 173-79. http://dx.doi.org/10.3724/SP.J.1105.2011.09432 DOI: https://doi.org/10.3724/SP.J.1105.2011.09432
Yang B, Fu XR, Yang W, et al. Numerical prediction of phase-change heat conduction of injection-molded HDPE thick-walled parts via the enthalpy transforming model with mushy zone. Polym Eng Sci 2008; 48: 1707-17. http://dx.doi.org/10.1002/pen.21076 DOI: https://doi.org/10.1002/pen.21076
Liang SP, Yang B, Fu XR, et al. A simple method for forecast of cooling time of high density polyethylene during gas-
assisted injection molding. J Appl Polym Sci 2010; 117: 729-35. http://dx.doi.org/10.1002/app.31259 DOI: https://doi.org/10.1002/app.31259
Yang B, Fu XR, Yang W, et al. Effect of melt and mold temperatures on the solidification behavior of HDPE during gas-assisted injection molding: an enthalpy transformation approach. Macromol Mater Eng 2009; 294: 336-44. http://dx.doi.org/10.1002/mame.200900017 DOI: https://doi.org/10.1002/mame.200900017
Yang B, Miao JB, Min K, et al. Solidification behavior of high-density polyethylene during injection molding process: enthalpy transformation method. J Appl Polym Sci 2013; 128: 1922-29. DOI: https://doi.org/10.1002/app.38376
Yang B, Fu XR, Yang W, et al. Simulation of phase-change heat transfer during cooling stage of gas-assisted injection molding of high-density polyethylene via enthalpy transformation approach. Polym Eng Sci 2009; 49: 1234-42. http://dx.doi.org/10.1002/pen.21291 DOI: https://doi.org/10.1002/pen.21291
Kwon K, Isayev AI, Kim KH. Theoretical and experimental studies of anisotropic shrinkage in injection moldings of semicrystalline polymers. Polym Eng Sci 2006; 46: 712-28. http://dx.doi.org/10.1002/pen.20546 DOI: https://doi.org/10.1002/pen.20546
Isayev AI, Lin TH, Kwon K. Frozen-in birefringence and anisotropic shrinkage in optical moldings: II. Comparison of simulations with experiments on light-guide plates. Polymer 2010; 51: 5623-39. http://dx.doi.org/10.1016/j.polymer.2010.09.055 DOI: https://doi.org/10.1016/j.polymer.2010.09.055
Sun N, Yang B, Wang L, et al. Crystallization behavior and molecular orientation of HDPE parts molded by gas-assisted injection molding. Polym Int 2012; 61: 622-30. http://dx.doi.org/10.1002/pi.3221 DOI: https://doi.org/10.1002/pi.3221
Deng SQ, Yang B, Miao JB, et al. Study on the solidification kinetics of high-density polyethylene during thin-walled injection molding process. J Polym Eng 2012; 32: 355-63. http://dx.doi.org/10.1515/polyeng-2012-0045 DOI: https://doi.org/10.1515/polyeng-2012-0045
Zhang K, Liu ZY, Yang B, et al. Cylindritic structures of high-density polyethylene molded by multi-melt multi-injection molding. Polymer 2011; 52: 3871-78. http://dx.doi.org/10.1016/j.polymer.2011.06.004 DOI: https://doi.org/10.1016/j.polymer.2011.06.004
Yang B, Xia R, Miao JB, et al. Probing solidification kinetics of high-density polyethylene during injection molding using an in-situ measurement technique. Polym Test 2013; 32: 202-208. http://dx.doi.org/10.1016/j.polymertesting.2012.10.004 DOI: https://doi.org/10.1016/j.polymertesting.2012.10.004
Wang X, Yang B, Xia R, et al. Thermal stability and rheological properties of polyethylene (PE)/polyvinylchloride (PVC)/wood composites. J Res Updates Polym Sci 2012; 1: 101-09. DOI: https://doi.org/10.6000/1929-5995.2012.01.02.6
Greco R, Mucciariello G, Ragosta G, et al. Properties of polyethylene-polypropylene blends. J Mater Sci 1980; 15: 845-53. http://dx.doi.org/10.1007/BF00552093 DOI: https://doi.org/10.1007/BF00552093
Katti SS, Schultz JM. The microstructure of injection-molded semicrystalline polymers: A review. Polym Eng Sci 1982; 22, 1001-17. http://dx.doi.org/10.1002/pen.760221602 DOI: https://doi.org/10.1002/pen.760221602
Yang B, Fu XR, Yang W, et al. Prediction of heat conduction with phase-change effects during cooling stage of injection molding of high density polyethylene: approximate integral approach. J Macromol Sci B: Phys 2010; 49: 734-49. DOI: https://doi.org/10.1080/00222341003600780
Wang L, Yang B, Yang W, et al. Morphology and mechanical property of high-density polyethylene parts prepared by gas-assisted injection molding. Colloid Polym Sci 2011; 289: 1661-71. http://dx.doi.org/10.1007/s00396-011-2483-z DOI: https://doi.org/10.1007/s00396-011-2483-z
Wang L, Yang B, Yang W, et al. Role of gas delay time on the hierarchical crystalline structure and mechanical property of HDPE molded by gas-assisted injection molding. Colloid Polym Sci 2012; 290: 1133-44. DOI: https://doi.org/10.1007/s00396-012-2610-5
Yang B, Yang MB, Wang WJ, et al. Effect of long chain branching on non-isothermal crystallization behavior of polyethylenes synthesized with constrained geometry catalyst. Polym Eng Sci 2012; 52: 21-34. http://dx.doi.org/10.1002/pen.22040 DOI: https://doi.org/10.1002/pen.22040
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2013 Bin Yang, Gui-Jing Li, Ming-Bo Yang, Li-Feng Su, Ji-Bin Miao, Ru Xia, Peng Chen, Shuang-Quan Deng, Jia-Sheng Qian
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Policy for Journals/Articles with Open Access
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are permitted and encouraged to post links to their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work
Policy for Journals / Manuscript with Paid Access
Authors who publish with this journal agree to the following terms:
- Publisher retain copyright .
- Authors are permitted and encouraged to post links to their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work .