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In this study, a series of block copolymers (BCPs) composed of poly(\u03b5-caprolactone) (PCL; A block) as a soft segment and poly(N-vinylpyrrolidone) (PVP; B block) as a CDA-compatible segment were synthesized as toughening additives for CDA. Incorporation of the PVP segment into the BCPs suppressed macrophase separation of PCL, leading to the formation of dispersed PCL domains with radii of 4.4\u221219.4 nm. The mechanical properties of the CDA films were improved by adding 10 wt % BCPs, with toughness increasing 4.09- to 12.4-fold over neat-CDA depending on BCP architecture. BAB- and AB2-type BCPs were more effective than AB-type BCPs, correlating with their ability to generate smaller domains and reduce the interdomain spacing (ligament thickness). In particular, significant toughness enhancement was observed when the ligament thickness was reduced to &amp;lt;60 nm.<\/jats:p>","DOI":"10.1021\/acs.biomac.6c01399","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T19:03:12Z","timestamp":1790794992000},"page":"6814-6825","source":"Crossref","is-referenced-by-count":0,"title":["Toughening of Cellulose Diacetate Through Microphase-Controlled Blending of Poly(\u03b5-Caprolactone)\u2212Poly(\n                    <i>N<\/i>\n                    -Vinylpyrrolidone) Block Copolymers"],"prefix":"10.1021","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-2176-4587","authenticated-orcid":true,"given":"Sho","family":"Fukushima","sequence":"first","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takaya","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuki","family":"Tsuji","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi","family":"Katsuhara","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5515-665X","authenticated-orcid":true,"given":"Weeranuch","family":"Lang","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6522-2523","authenticated-orcid":true,"given":"Feng","family":"Li","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9716-8237","authenticated-orcid":true,"given":"Takuya","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6775-9850","authenticated-orcid":true,"given":"Kenji","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Kanazawa University , , Kadoma-cho , ,","place":["Kanazawa, Japan, 920-1192"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3238-813X","authenticated-orcid":true,"given":"Kenji","family":"Tajima","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5449-9642","authenticated-orcid":true,"given":"Toshifumi","family":"Satoh","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]},{"name":"Hokkaido University , , Kita 21, Nishi 10, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 001-0021"]},{"name":"National Central University , , ,","place":["Taoyuan, Taiwan, 320317"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3746-2084","authenticated-orcid":true,"given":"Takuya","family":"Isono","sequence":"additional","affiliation":[{"name":"Hokkaido University , , Kita 13, Nishi 8, Kita-ku , , ,","place":["Sapporo, Hokkaido, Japan, 060-8628"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"issue":"10","key":"2026101210565669900_cit1","doi-asserted-by":"publisher","first-page":"4455","DOI":"10.1021\/acs.macromol.0c02814","article-title":"Plastic Pollution: A Material Problem?","volume":"54","author":"Millican","year":"2021","journal-title":"Macromolecules"},{"issue":"1","key":"2026101210565669900_cit2","doi-asserted-by":"publisher","first-page":"2001121","DOI":"10.1002\/advs.202001121","article-title":"Seawater-Degradable Polymers\ue5f8Fighting the Marine Plastic Pollution","volume":"8","author":"Wang","year":"2021","journal-title":"Adv. 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