Surface Defect Formation in the Injection Molding of Acrylonitrile-Styrene-Acrylate Polymers

1996 ◽  
Vol 11 (1) ◽  
pp. 76-81 ◽  
Author(s):  
M. C. O. Chang
Keyword(s):  
Injection Molding ◽  
Surface Defect ◽  
Defect Formation ◽  
Acrylate Polymers

Bubble morphological evolution and surface defect formation mechanism in the microcellular foam injection molding process

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70032-70050 ◽  
Author(s):  
Lei Zhang ◽  
Guoqun Zhao ◽  
Guiwei Dong ◽  
Shuai Li ◽  
Guilong Wang
Keyword(s):  
Injection Molding ◽  
Surface Defect ◽  
Defect Formation ◽  
Morphological Evolution ◽  
Injection Molding Process ◽  
Multiphase Model ◽  
Microcellular Foam ◽  
Molding Process ◽  
Foam Injection Molding ◽  
Surface Collapse

A multiphase model was established to simulate the bubble morphological evolution in MFIM, and a new phenomenon of surface collapse and pits with the gradient depth was discovered.

Facet-dependent evolution of surface defects in anatase TiO2 by thermal treatment: implications for environmental applications of photocatalysis

2019 ◽  
Vol 6 (6) ◽  
pp. 1740-1753 ◽  
Author(s):  
Tong Li ◽  
Zelin Shen ◽  
Yiling Shu ◽  
Xuguang Li ◽  
Chuanjia Jiang ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Surface Defect ◽  
Surface Defects ◽  
Defect Formation ◽  
Anatase Tio2 ◽  
Environmental Applications

Exposed crystal facets of TiO2 nanomaterials significantly affect the surface defect formation of the materials during thermal treatment.

Surface Defect Formation in Epitaxial Si Grown on Boron-Doped Substrates by Ultrahigh Vacuum Chemical Vapor Deposition

2001 ◽  
Vol 40 (Part 2, No. 10A) ◽  
pp. L1051-L1053
Author(s):  
Taisuke Furukawa ◽  
Takumi Nakahata ◽  
Shigemitsu Maruno ◽  
Junji Tanimura ◽  
Yasunori Tokuda ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Surface Defect ◽  
Defect Formation ◽  
Ultrahigh Vacuum ◽  
Chemical Vapor ◽  
Boron Doped

On an intrinsic mechanism of surface defect formation producing polar, multidomain real-structures in molecular crystals

1998 ◽  
Vol 213 (9) ◽  
Author(s):  
J. Hulliger
Keyword(s):  
Surface Defect ◽  
Defect Formation ◽  
Point Of View ◽  
Intrinsic Defect ◽  
Orientational Disorder ◽  
Surface Attachment ◽  
Pyroelectric Effect ◽  
Attachment Sites ◽  
Intrinsic Mechanism ◽  
Large Growth

AbstractDipolar but achiral organic molecules may undergo orientational disorder in the bulk but particularly at the surface of a seed crystal. In cases where the activation energy for reversal of the dipoles in the bulk is much larger than that for reversal at the growing crystal faces, thermodynamic arguments predict that orientational disorder occurring at surface attachment sites can produce metastable but macroscopically large growth sectors, featuring different polar properties than the seed. If the process of nucleation produces a non-pyroelectric symmetry group, then orientational disorder at the surface may give rise to pyroelectric properties during subsequent growth. Similarly, for seeds belonging to a pyroelectric group, orientational disorder can reduce the initial pyroelectric effect. According to this new surface-related mechanism of intrinsic defect formation, acentric and achiral molecules are likely to form real-structures which show a pyroelectric effect, although from a crystallographic point of view, such crystals may be described topologically by e.g. a centric structure. These present views are applied to the space group

scholarly journals Reducing the Burn Marks on Injection-Molded Parts by External Gas-Assisted Injection Molding

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4087
Author(s):  
Jiquan Li ◽  
Wenyong Liu ◽  
Xinxin Xia ◽  
Hangchao Zhou ◽  
Liting Jing ◽  
...  
Keyword(s):  
Image Processing ◽  
Injection Molding ◽  
Delay Time ◽  
Quantitative Method ◽  
Surface Defect ◽  
Processing Method ◽  
Traditional Methods ◽  
Molded Parts ◽  
Injection Molded ◽  
Conventional Injection Molding

A burn mark is a sort of serious surface defect on injection-molded parts. In some cases, it can be difficult to reduce the burn marks by traditional methods. In this study, external gas-assisted injection molding (EGAIM) was introduced to reduce the burn marks, as EGAIM has been reported to reduce the holding pressure. The parts with different severities of burn marks were produced by EGAIM and conventional injection molding (CIM) with the same molding parameters but different gas parameters. The burn marks were quantified by an image processing method and the quantitative method was introduced to discuss the influence of the gas parameters on burn marks. The results show that the burn marks can be eliminated by EGAIM without changing the structure of the part or the mold, and the severity of the burn marks changed from 4.98% with CIM to 0% with EGAIM. Additionally, the gas delay time is the most important gas parameter affecting the burn marks.

Deposition, Defect and Weak Bond Formation Processes in a-Si:H

1998 ◽  
Vol 507 ◽  
Author(s):  
J Robertson ◽  
M J Powell
Keyword(s):  
Hydrogen Evolution Reaction ◽  
Surface Defect ◽  
Defect Formation ◽  
Defect Density ◽  
Bond Formation ◽  
Surface Processes ◽  
Formation Processes ◽  
Weak Bond ◽  
Further Development ◽  
Surface Defect Density

ABSTRACTThe growth of a-Si:H and the resulting weak bond and defect formation mechanism is analysed in terms of the adsorbed Sill3 model of growth. It is found that this model describes the surface processes well, but it needs further development to correctly describe the temperature dependence of the formation of defects and weak bonds, since the surface defect density decreases monotonically with temperature and does not show a minimum near 250C. We show that the experimentally observed increase in hydrogen content, weak bond and defect density at lower deposition temperatures can be accounted for by a hydrogen evolution reaction from H2* sites.

Surface‐defect formation in graphite targets during magnetron sputtering

1990 ◽  
Vol 8 (4) ◽  
pp. 3157-3162 ◽  
Author(s):  
C. W. Chen ◽  
D. M. Makowiecki ◽  
C. S. Alford ◽  
M. A. McKernan ◽  
P. B. Ramsey
Keyword(s):  
Magnetron Sputtering ◽  
Surface Defect ◽  
Defect Formation
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