Stereocomplex Crystallization Behavior and Physical Properties of Linear 1‐Arm, 2‐Arm, and Branched 4‐Arm Poly(L‐lactide)/Poly(D‐lactide) Blends: Effects of Chain Directional Change and Branching. Issue 7 (7th February 2013)

• Record Type: Journal Article
• Authors: Sakamoto, Yuzuru; Tsuji, Hideto
• Is Part Of: Macromolecular chemistry and physics. Volume 214:Issue 7(2013:Apr.)
• Page Start: 776
• Page End: 786
• Publication Date: 2013-02-07
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201200657
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>For number‐average molecular weight (<overline><italic>M</italic></overline>_n) below 1 × 10⁴ g mol⁻¹, the comparison of cold crystallization temperature and spherulite growth rate and crystallinity of linear 1‐arm, 2‐arm, and branched 4‐arm poly(<sc>L</sc>‐lactide)/poly(<sc>D</sc>‐lactide) blends exhibits that the effects of chain directional change and branching significantly disturb stereocomplex crystallization. In contrast, the comparison of glass transition and melting temperatures of linear 1‐arm, 2‐arm, and branched 4‐arm poly(<sc>L</sc>‐lactide)/poly(<sc>D</sc>‐lactide) blends indicates that the effects of chain directional change and branching insignificantly alter and largely increase the segmental mobility of the blends, respectively, and the crystalline thickness of the blends is determined by <overline><italic>M</italic></overline>_n per one arm not by <overline><italic>M</italic></overline>_n and is not affected by the molecular architecture.<boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg1x6h5mn0" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>