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Despite the inherent immiscibility of PBS and PA4, multiblock structure allows to mix the two components in the solution\u2010cast films from solution. The mechanical properties of the cast films are highly dependent on the mDP of each unit, as demonstrated by tensile tests. The film of the copolymer with the lowest mDP of each unit (PBS: 17, PA4: 10) is transparent and exhibits extremely high elongation at break (&gt; 400%) and high tensile stress (39.5\u00a0MPa) with strain hardening. The films with 50% or higher crystallinity are brittle and opaque, while a decrease in crystallinity can result in higher elongation, as revealed by wide\u2010angle X\u2010ray diffraction measurements.<\/jats:p>","DOI":"10.1002\/marc.202300155","type":"journal-article","created":{"date-parts":[[2023,5,16]],"date-time":"2023-05-16T10:06:32Z","timestamp":1684231592000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Synthesis of Multiblock Copolymer Composed of Biodegradable Poly(butylene succinate) and Poly(2\u2010pyrrolidone): Impact of Each Block Length on the Mechanical Properties"],"prefix":"10.1002","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5655-2248","authenticated-orcid":false,"given":"Hideaki","family":"Ono","sequence":"first","affiliation":[{"name":"Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5146-2956","authenticated-orcid":false,"given":"Yasutaka","family":"Kawai","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5354-6600","authenticated-orcid":false,"given":"Seisuke","family":"Ata","sequence":"additional","affiliation":[{"name":"Research Institute for Chemical Process Technology National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6397-7861","authenticated-orcid":false,"given":"Hiroyuki","family":"Minamikawa","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1757-1075","authenticated-orcid":false,"given":"Kazuma","family":"Kurihara","sequence":"additional","affiliation":[{"name":"Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology (AIST)  1\u20102\u20101 Higashi Tsukuba Ibaraki 305\u20108564 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3300-2398","authenticated-orcid":false,"given":"Shinji","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9220-4312","authenticated-orcid":false,"given":"Masaru","family":"Yoshida","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST)  1\u20101\u20101 Higashi Tsukuba Ibaraki 305\u20108565 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,5,28]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.1700782"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abg5433"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.envpol.2013.08.013"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.oneear.2020.10.020"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6700(01)00039-9"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.addr.2016.06.012"},{"key":"e_1_2_7_7_1","volume":"10","author":"Barreto L. 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