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Polymers
Special Issues
Stereocomplexation in Polymers
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Stereocomplexation in Polymers

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Processing and Engineering".

Deadline for manuscript submissions: closed (30 September 2020) | Viewed by 6742

Special Issue Editors

Dr. Ester Zuza

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Guest Editor
Department of Mining-Metallurgy Engineering and Materials Science, POLYMAT, University of the Basque Country UPV/EHU, School of Engineering, Alameda de Urquijo s/n, 48013 Bilbao, Spain
Interests: biodegradable polyesters; miscible blends; specific interactions; mechanical properties; dynamic fragility
Dr. Ainhoa Lejardi

E-Mail Website
Guest Editor
Department of Mining-Metallurgy Engineering and Materials Science and POLYMAT, School of Engineering, University of the Basque Country (EHU-UPV), 48013 Bilbao, Spain
Interests: biopolymers; graft copolymers; polymer miscibility; drug delivery
Prof. Dr. Jose-Ramon Sarasua

E-Mail Website
Guest Editor
The University of the Basque Country (UPV/EHU) and Basque Center for Macromolecular Design and Engineering POLYMAT, 480130 Bilbao, Spain
Interests: biodegradable polymers; medical polymers; structure–property relationships
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Stereocomplexation is a specific crystallization of enantiomeric polymers, which enhance the thermal and mechanical properties of these polymers compared with their homocrystal-containing counterparts. This feature enables us to achieve new frontiers in polymer science design in a wide scope of applications.

The bullseye of stereocomplexes are the polylactides (and consequently, their copolymers) owing to their biodegradability and the unquestionable alternative to petroleum-derived polymers. In any case, other kind of enantiomeric families, as other polyesters and polyamides, are not be neglected.

The aim of this Special Issue is to address the progress in polymeric systems with improved properties due to stereocomplexation. Accordingly, authors writing on subjects such as stereospecific polymers, stereoselective polymerization, and stereocrystallization are invited to contribute to this Special Issue of Polymers.

Dr. Ester Zuza,

Dr. Ainhoa Lejardi 

Dr. Jose Ramon Sarasua

Guest Editors


Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • stereocomplexes
  • crystallization
  • blends
  • polylactides
  • poly (lactic acid)s
  • poly(α-hydroxy-acid)s

Published Papers (2 papers)

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Research

13 pages, 7154 KiB  
Article
Formation of Stereocomplex Crystal and Its Effect on the Morphology and Property of PDLA/PLLA Blends
by Xiaolong Su, Lihua Feng and Demei Yu
Polymers 2020, 12(11), 2515; https://doi.org/10.3390/polym12112515 - 28 Oct 2020
Cited by 19 | Viewed by 2745
Abstract
Stereocomplex-polylactic acid (SC-PLA) is obtained in poly(d-lactic) acid/poly(l-lactic) acid (PDLA/PLLA) blends under adjusting processing conditions. It is found that the degree of crystallinity of overall SC-PLA is up to 43.7% in PDLA/PLLA blends of 1:1 mass ratio. Formation of [...] Read more.
Stereocomplex-polylactic acid (SC-PLA) is obtained in poly(d-lactic) acid/poly(l-lactic) acid (PDLA/PLLA) blends under adjusting processing conditions. It is found that the degree of crystallinity of overall SC-PLA is up to 43.7% in PDLA/PLLA blends of 1:1 mass ratio. Formation of stereocomplex (SC) crystals forces molecular chains in the blends to be more closely arranged and further enhances interaction between molecular chains, thus forming a physical cross-linking network in the SC crystals, resulting in the blends having a special microstructure. The mechanism of formation of the SC crystal physical cross-linking network is elucidated by dielectric spectroscopy, and the relationships between homocomplex (HC) crystals, SC crystals, and amorphous regions in the blends are also analyzed. Interestingly, mechanical properties of the blends are significantly improved due to formation of an SC crystal cross-linking network. Full article
(This article belongs to the Special Issue Stereocomplexation in Polymers)
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15 pages, 3679 KiB  
Article
Stereocomplexation of Poly(lactic acid) and Chemical Crosslinking of Ethylene Glycol Dimethacrylate (EGDMA) Double-Crosslinked Temperature/pH Dual Responsive Hydrogels
by Zhidan Wang, Jie Wu, Xiaoyu Shi, Fei Song, Wenli Gao and Shouxin Liu
Polymers 2020, 12(10), 2204; https://doi.org/10.3390/polym12102204 - 25 Sep 2020
Cited by 13 | Viewed by 3313
Abstract
Physical crosslinking and chemical crosslinking were used to further improve the mechanical properties and stability of the gel. A temperature/pH dual sensitive and double-crosslinked gel was prepared by the stereo-complex of HEMA-PLLA20 and HEMA-PDLA20 as a physical crosslinking agent, ethylene glycol [...] Read more.
Physical crosslinking and chemical crosslinking were used to further improve the mechanical properties and stability of the gel. A temperature/pH dual sensitive and double-crosslinked gel was prepared by the stereo-complex of HEMA-PLLA20 and HEMA-PDLA20 as a physical crosslinking agent, ethylene glycol dimethacrylate (EGDMA) as a chemical crosslinking agent, and azodiisobutyronitrile (AIBN) as an initiator for free radical polymerization. This paper focused on the performance comparison of chemical crosslinked gel, a physical crosslinked gel, and a dual crosslinked gel. The water absorption, temperature, and pH sensitivity of the three hydrogels were studied by a scanning electron microscope (SEM) and swelling performance research. We used a thermal analysis system (TGA) and dynamic viscoelastic spectrometer to study thermal properties and mechanical properties of these gels. Lastly, the in vitro drug release behavior of double-crosslinked hydrogel loaded with doxorubicin under different conditions was studied. The results show that the double-crosslinked and temperature/pH dual responsive hydrogels has great mechanical properties and good stability. Full article
(This article belongs to the Special Issue Stereocomplexation in Polymers)
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