Morphology and thermal expansion in large HDPE injection moldings
ABSTRACT Morphology and linear coefficients of thermal expansion (LCTE) within the wall of a large (10 kg) injection molded container were evaluated. The study employed polarized light microscopic birefringence techniques, differential scanning calorimetry, scanning electron microscopy (SEM), as wel...
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| Veröffentlicht in: | Journal of applied polymer science 2019-05, Vol.136 (19), p.n/a |
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| creator | Leung, Mathew Gnatowski, Marek Sun, Grace Stanese, Adrian Wong, Tonny |
| description | ABSTRACT
Morphology and linear coefficients of thermal expansion (LCTE) within the wall of a large (10 kg) injection molded container were evaluated. The study employed polarized light microscopic birefringence techniques, differential scanning calorimetry, scanning electron microscopy (SEM), as well as thermal mechanical analysis to determine the LCTE anisotropy in the skin and core of the wall. A difference in crystallinity between skin and core was found, and a region with distinct lamellas was seen under SEM without sample etching. A large variability in anisotropy of the LCTE was found in the relatively thick (~700 μm) skin of the molding. The LCTE differences between skin and core were attributed to molecular orientation related to resin flow. LCTE anisotropy as an important source of residual stress in the transition zone between skin and core was confirmed by fractographic analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47507.
Fractographic marks on the crack surface: (1) rib mark, (2) hackles radiating from the crack progression front and progressing towards the surface, (3) tip of the crack in arrest and likely crack progression front, (4) fracture step, and (5) direction of the crack propagation. |
| doi_str_mv | 10.1002/app.47507 |
| format | Article |
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Morphology and linear coefficients of thermal expansion (LCTE) within the wall of a large (10 kg) injection molded container were evaluated. The study employed polarized light microscopic birefringence techniques, differential scanning calorimetry, scanning electron microscopy (SEM), as well as thermal mechanical analysis to determine the LCTE anisotropy in the skin and core of the wall. A difference in crystallinity between skin and core was found, and a region with distinct lamellas was seen under SEM without sample etching. A large variability in anisotropy of the LCTE was found in the relatively thick (~700 μm) skin of the molding. The LCTE differences between skin and core were attributed to molecular orientation related to resin flow. LCTE anisotropy as an important source of residual stress in the transition zone between skin and core was confirmed by fractographic analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47507.
Fractographic marks on the crack surface: (1) rib mark, (2) hackles radiating from the crack progression front and progressing towards the surface, (3) tip of the crack in arrest and likely crack progression front, (4) fracture step, and (5) direction of the crack propagation.</description><identifier>ISSN: 0021-8995</identifier><identifier>EISSN: 1097-4628</identifier><identifier>DOI: 10.1002/app.47507</identifier><language>eng</language><publisher>Hoboken, USA: John Wiley & Sons, Inc</publisher><subject>Anisotropy ; Birefringence ; Differential scanning calorimetry ; Materials science ; Mechanical analysis ; microscopy ; molding ; Moldings ; Morphology ; Polarized light ; Polymers ; polyolefins ; Residual stress ; Scanning electron microscopy ; Thermal expansion ; thermal properties</subject><ispartof>Journal of applied polymer science, 2019-05, Vol.136 (19), p.n/a</ispartof><rights>2019 Wiley Periodicals, Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2977-3b4aa9d540708d66040e7b357008a44e44068e924c5d37b14fe41fd6fcae7b263</citedby><cites>FETCH-LOGICAL-c2977-3b4aa9d540708d66040e7b357008a44e44068e924c5d37b14fe41fd6fcae7b263</cites><orcidid>0000-0002-2163-3494</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fapp.47507$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fapp.47507$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Leung, Mathew</creatorcontrib><creatorcontrib>Gnatowski, Marek</creatorcontrib><creatorcontrib>Sun, Grace</creatorcontrib><creatorcontrib>Stanese, Adrian</creatorcontrib><creatorcontrib>Wong, Tonny</creatorcontrib><title>Morphology and thermal expansion in large HDPE injection moldings</title><title>Journal of applied polymer science</title><description>ABSTRACT
Morphology and linear coefficients of thermal expansion (LCTE) within the wall of a large (10 kg) injection molded container were evaluated. The study employed polarized light microscopic birefringence techniques, differential scanning calorimetry, scanning electron microscopy (SEM), as well as thermal mechanical analysis to determine the LCTE anisotropy in the skin and core of the wall. A difference in crystallinity between skin and core was found, and a region with distinct lamellas was seen under SEM without sample etching. A large variability in anisotropy of the LCTE was found in the relatively thick (~700 μm) skin of the molding. The LCTE differences between skin and core were attributed to molecular orientation related to resin flow. LCTE anisotropy as an important source of residual stress in the transition zone between skin and core was confirmed by fractographic analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47507.
Fractographic marks on the crack surface: (1) rib mark, (2) hackles radiating from the crack progression front and progressing towards the surface, (3) tip of the crack in arrest and likely crack progression front, (4) fracture step, and (5) direction of the crack propagation.</description><subject>Anisotropy</subject><subject>Birefringence</subject><subject>Differential scanning calorimetry</subject><subject>Materials science</subject><subject>Mechanical analysis</subject><subject>microscopy</subject><subject>molding</subject><subject>Moldings</subject><subject>Morphology</subject><subject>Polarized light</subject><subject>Polymers</subject><subject>polyolefins</subject><subject>Residual stress</subject><subject>Scanning electron microscopy</subject><subject>Thermal expansion</subject><subject>thermal properties</subject><issn>0021-8995</issn><issn>1097-4628</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp1kMFOwzAMhiMEEmVw4A0qceLQzWmdpD1WY2NIQ-wA5yht065T15RkE-ztyShXTpb9f7alj5B7ClMKEM_UMExRMBAXJKCQiQh5nF6SwGc0SrOMXZMb53YAlDLgAclfjR22pjPNKVR9FR622u5VF-rvQfWuNX3Y9mGnbKPD1dNm4budLg_n-d50Vds37pZc1apz-u6vTsjHcvE-X0Xrt-eXeb6OyjgTIkoKVCqrGIKAtOIcELQoEiYAUoWoEYGnOouxZFUiCoq1RlpXvC6V52KeTMjDeHew5vOo3UHuzNH2_qWMqeCcsgQTTz2OVGmNc1bXcrDtXtmTpCDPhqQ3JH8NeXY2sl9tp0__gzLfbMaNH28uZkI</recordid><startdate>20190515</startdate><enddate>20190515</enddate><creator>Leung, Mathew</creator><creator>Gnatowski, Marek</creator><creator>Sun, Grace</creator><creator>Stanese, Adrian</creator><creator>Wong, Tonny</creator><general>John Wiley & Sons, Inc</general><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0002-2163-3494</orcidid></search><sort><creationdate>20190515</creationdate><title>Morphology and thermal expansion in large HDPE injection moldings</title><author>Leung, Mathew ; Gnatowski, Marek ; Sun, Grace ; Stanese, Adrian ; Wong, Tonny</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2977-3b4aa9d540708d66040e7b357008a44e44068e924c5d37b14fe41fd6fcae7b263</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Anisotropy</topic><topic>Birefringence</topic><topic>Differential scanning calorimetry</topic><topic>Materials science</topic><topic>Mechanical analysis</topic><topic>microscopy</topic><topic>molding</topic><topic>Moldings</topic><topic>Morphology</topic><topic>Polarized light</topic><topic>Polymers</topic><topic>polyolefins</topic><topic>Residual stress</topic><topic>Scanning electron microscopy</topic><topic>Thermal expansion</topic><topic>thermal properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Leung, Mathew</creatorcontrib><creatorcontrib>Gnatowski, Marek</creatorcontrib><creatorcontrib>Sun, Grace</creatorcontrib><creatorcontrib>Stanese, Adrian</creatorcontrib><creatorcontrib>Wong, Tonny</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of applied polymer science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Leung, Mathew</au><au>Gnatowski, Marek</au><au>Sun, Grace</au><au>Stanese, Adrian</au><au>Wong, Tonny</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Morphology and thermal expansion in large HDPE injection moldings</atitle><jtitle>Journal of applied polymer science</jtitle><date>2019-05-15</date><risdate>2019</risdate><volume>136</volume><issue>19</issue><epage>n/a</epage><issn>0021-8995</issn><eissn>1097-4628</eissn><abstract>ABSTRACT
Morphology and linear coefficients of thermal expansion (LCTE) within the wall of a large (10 kg) injection molded container were evaluated. The study employed polarized light microscopic birefringence techniques, differential scanning calorimetry, scanning electron microscopy (SEM), as well as thermal mechanical analysis to determine the LCTE anisotropy in the skin and core of the wall. A difference in crystallinity between skin and core was found, and a region with distinct lamellas was seen under SEM without sample etching. A large variability in anisotropy of the LCTE was found in the relatively thick (~700 μm) skin of the molding. The LCTE differences between skin and core were attributed to molecular orientation related to resin flow. LCTE anisotropy as an important source of residual stress in the transition zone between skin and core was confirmed by fractographic analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47507.
Fractographic marks on the crack surface: (1) rib mark, (2) hackles radiating from the crack progression front and progressing towards the surface, (3) tip of the crack in arrest and likely crack progression front, (4) fracture step, and (5) direction of the crack propagation.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/app.47507</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-2163-3494</orcidid></addata></record> |
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| subjects | Anisotropy Birefringence Differential scanning calorimetry Materials science Mechanical analysis microscopy molding Moldings Morphology Polarized light Polymers polyolefins Residual stress Scanning electron microscopy Thermal expansion thermal properties |
| title | Morphology and thermal expansion in large HDPE injection moldings |
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