Stereo-Complex Crystallization of Poly(lactic acid)s in Block-Copolymer Phase Separation

2010 ◽  
Vol 2 (10) ◽  
pp. 2707-2710 ◽  
Author(s):  
Hiroki Uehara ◽  
Yusuke Karaki ◽  
Shizuka Wada ◽  
Takeshi Yamanobe
Keyword(s):  
Lactic Acid ◽  
Phase Separation ◽  
Block Copolymer ◽  
Poly Lactic Acid

Preparation of Anti-Fouling Poly(Lactic Acid)(PLA) Hollow Fiber Membranes via Non-Solvent Induced Phase Separation

2014 ◽  
Vol 884-885 ◽  
pp. 112-116
Author(s):  
Peng Shen ◽  
Kai Tu ◽  
Chang Yu Yang ◽  
Jian Li ◽  
Ru Xu Du
Keyword(s):  
Contact Angle ◽  
Lactic Acid ◽  
Phase Separation ◽  
Block Copolymer ◽  
Water Permeability ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Hollow Fibers ◽  
Poly Lactic Acid ◽  
Bsa Rejection

Anti-fouling PLA hollow fibers were fabricated using synthesized PLA-PEG-PLA copolymer as an additive to improve the hydrophilicity. The tri-block copolymer was prepared by ring-opening polymerization and a hydrophilic copolymer processing good compatibility with PLA molecule was obtained and utilized to fabricate membrane with PLA by NIPS. Elemental analysis showed that PLA-PEG-PLA could stably exist in membranes and endow the membrane with persistent hydrophilic. Thus the contact angle decreased nearly 20o with 5% PLA-PEG-PLA content, resulting in higher water permeability and BSA rejection which indicated the anti-fouling property of PLA membrane was improved.

Amphiphilic block copolymer poly(lactic acid)-block -(glycidylazide polymer)-block -polystyrene: synthesis and self-assembly

2017 ◽  
Vol 66 (7) ◽  
pp. 1037-1043 ◽  
Author(s):  
Guoping Li ◽  
Haoxue Dong ◽  
Menghui Liu ◽  
Min Xia ◽  
Chunpeng Chai ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Block Copolymer ◽  
Self Assembly ◽  
Amphiphilic Block Copolymer ◽  
Poly Lactic Acid ◽  
Copolymer Poly ◽  
Polymer Block

Modification of Melt-Spun Isotactic Polypropylene and Poly(lactic acid) Bicomponent Filaments with a Premade Block Copolymer

2012 ◽  
Vol 45 (2) ◽  
pp. 913-925 ◽  
Author(s):  
Sara A. Arvidson ◽  
Kristen E. Roskov ◽  
Jaimin J. Patel ◽  
Richard J. Spontak ◽  
Saad A. Khan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Block Copolymer ◽  
Isotactic Polypropylene ◽  
Poly Lactic Acid ◽  
Melt Spun

scholarly journals Effect of PMMA/Silica Hybrid Particles on Interfacial Adhesion and Crystallization Properties of Poly(lactic acid)/Block Acrylic Elastomer Composites

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2231 ◽  
Author(s):  
Gi Hong Kim ◽  
Sung Wook Hwang ◽  
Bich Nam Jung ◽  
DongHo Kang ◽  
Jin Kie Shim ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Phase Separation ◽  
Interfacial Adhesion ◽  
Crystallization Rate ◽  
Stability Limit ◽  
Industrial Applications ◽  
Poly Lactic Acid ◽  
Hybrid Particles ◽  
Crystallinity Degree ◽  
Silica Hybrid

Poly(lactic acid) (PLA) is a relatively brittle polymer, and its low melt strength, ductility, and thermal stability limit its use in various industrial applications. This study aimed to investigate the effect of poly(methyl methacrylate) (PMMA) and PMMA/silica hybrid particles on the mechanical properties, interfacial adhesion, and crystallization behavior of PLA/block acrylic elastomer. PLA/block acrylic elastomer blends exhibit improved flexibility; however, phase separation occurs between PLA and block acrylic elastomer domains. Valid time-temperature superposition (TTS) measurements of viscoelastic behavior were obtained and exhibited interfacial adhesion with the addition of PMMA or PMMA/silica in PLA/block acrylic elastomer blends. In particular, the phase separation temperature was increased by the incorporation of PMMA/silica hybrid particles, which suggests a potential role for these particles in improving the phase stability. In addition, PMMA inhibits crystallization, while PMMA/silica acts as a nucleating agent, thus increasing the crystallization rate and crystallinity degree.

Multifilament yarns of polyoxymethylene/poly(lactic acid) blends produced by a melt-spinning method

2019 ◽  
Vol 90 (3-4) ◽  
pp. 294-301 ◽  
Author(s):  
Weraporn Pivsa-Art ◽  
Sommai Pivsa-Art
Keyword(s):  
Lactic Acid ◽  
Phase Separation ◽  
Melt Spinning ◽  
Morphological Analysis ◽  
Poly Lactic Acid ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Multifilament Yarns

Multifilament yarns of polyoxymethylene (POM) and poly(lactic acid) (PLA) blends were prepared using a melt-spinning method. The ratios of the POM/PLA fibers studied were 10/90, 30/70, 50/50, 70/30, and 10/90 by weight compared with that of the pure polymers. The extrusion of the dry blend polymers was carried out using a single-screw extruder at 180–210℃ with a winding speed of 800 m/min. The thermal and morphological analysis of the multifilament yarn confirmed the phase separation of the two polymers. However, the mechanical properties of the blends showed excellent elongation at break, which confirmed the good distribution of PLA in the POM matrix. POM/PLA with weight ratios of 70/30 and 90/10 showed high tenacity. The elongation of the POM/PLA blends shows excellent results, which is unusual for polymer blends with phase separation.

Porous structure formation via phase separation of two polymers Blends of aromatic polyoxalates and poly(lactic acid)

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Ivan Zorin ◽  
Nadja Ovcharenko ◽  
Yan Batuto ◽  
Alexander Bilibin
Keyword(s):  
Lactic Acid ◽  
Phase Separation ◽  
Structure Formation ◽  
Porous Polymer ◽  
Poly Lactic Acid ◽  
Degradable Polymers ◽  
Degradation Rates ◽  
Alkaline Conditions ◽  
Co Precipitation ◽  
Degradation Properties

Abstract A new method of porous polymer structure formation by means of phase separation of two polymers with different degradation rates is proposed. Aromatic polyesters of oxalic acid as fast degradable polymers were synthesized and their degradation properties under alkaline conditions were studied. Heterogeneous mixtures of poly(phenolphthalein oxalate) with poly(lactic acid) were prepared by solution phase separation and co-precipitation, and porous poly(lactic acid) samples were produced by polyoxalate leaching due to its fast degradation.

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