scholarly journals Photochromic Polyamide 6 Based on Spiropyran Synthesized via Hydrolyzed Ring-Opening Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2496
Author(s):  
Shiyou Tian ◽  
Jicong Zhang ◽  
Qiong Zhou ◽  
Limei Shi ◽  
Wenwen Wang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Ring Opening ◽  
Uv Light ◽  
Polyamide 6 ◽  
Ring Opening Polymerization ◽  
Polymer Chains ◽  
Photochromic Property ◽  
Crystallinity Degree ◽  
Property Analysis

We report photochromic polyamide 6 (PA6) which was synthesized by hydrolyzed ring-opening polymerization of ε-caprolactam with spiropyran (SP) embedded in the polymer chains. It indicated that crystallinity degree of the resulting copolymers was decreased since only PA6 segments can crystallize with increasing content of SP modifier. Meanwhile, toughness of photochromic PA6 was decreased. The photochromic property analysis indicated that the sample with more flexibility and more content of SP was more sensitive to UV light at the beginning of irradiation than other samples and its color after being irradiated for 1 min tended to reddish. Investigation revealed that the UV-vis absorbance of SP-PA6-3 had negligible decay after 10 cycles, which indicated SP-modified PA6 possessed excellent photoresponse reversibility and fatigue resistance.

scholarly journals End-Group Evaluation of HEMA Initiated Poly(ε-caprolactone) Macromonomers via Enzymatic Ring-Opening Polymerization

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
N. Ugur Kaya ◽  
Y. Avcibasi Guvenilir
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Average Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Enzyme Concentration ◽  
Polymer Chains ◽  
Side Reactions ◽  
Initiator Concentration ◽  
Lower Temperature

Poly(ε-caprolactone) (PCL) macromonomers comprising acrylate end-functionality were synthesized via enzymatic ring-opening polymerization (eROP) by utilizing commercially availableCandida antarcticaLipase B (CALB), Novozyme-435. 2-Hydroxyethyl methacrylate (HEMA) was purposed to be the nucleophilic initiator in eROP. The side reactions generated due to the cleavage of ester bonds in HEMA and the growing polymer chains were investigated through altering polymerization period, initiator concentration, temperature, and enzyme concentration.1H NMR evaluations showed that minimum quantities of side reactions were in lower temperatures, initiator concentration, enzyme concentration, and lower monomer conversions. Gel permeation chromatography (GPC) results revealed that lower polydispersity along with number-average molecular weight of end-functionalized PCL macromonomers was obtained depending on higher initiator/monomer ratios, lower temperature (60°C), enzyme concentration (100 mg), and/or polymerization time (2 h). Furthermore, 0.1 HEMA/ε-caprolactone (CL) ratio had higher molecular weight than 0.5 HEMA/CL ratio, while keeping a close value of methacrylate transfer, total methacrylate end-groups, and lower polyester transfer.

The Study of Thermolplastic Elastomer Based on Polyamide 6: Preparation, Morphology and Mechanical Performance

2011 ◽  
Vol 332-334 ◽  
pp. 1490-1493
Author(s):  
Chun Wang Yi ◽  
Nan Fan Li ◽  
Chao Sheng Wang ◽  
Zhi Han Peng ◽  
Shi Yan Chen
Keyword(s):  
Adipic Acid ◽  
Acid Content ◽  
Ring Opening ◽  
Mechanical Performance ◽  
Thermoplastic Elastomer ◽  
Polyamide 6 ◽  
Ring Opening Polymerization ◽  
Polymerization Process ◽  
End Groups ◽  
Mechanical Performances

In this study,a new thermoplastic elastomer based on polyamid 6, and polytetrahydrofuran was prepared by continuous hydrolytic ring-opening polymerization process. The effective of adipic acid content on the number-average molecular and the content of amino end groups was investigated. The morphology deduce of TPMP, mechanical performances were also investigated.

In situsynthesis of polyamide 6/MWNTs nanocomposites by anionic ring opening polymerization

2009 ◽  
Vol 111 (3) ◽  
pp. 1278-1285 ◽  
Author(s):  
Dongguang Yan ◽  
Tingxiu Xie ◽  
Guisheng Yang
Keyword(s):  
Ring Opening ◽  
Polyamide 6 ◽  
Ring Opening Polymerization ◽  
Anionic Ring

Influence of a resorcin[4]arene core structure on the spatial directionality of multi-arm poly(ε-caprolactone)s

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16864-16870 ◽  
Author(s):  
Ruizhi Wu ◽  
Talal F. Al-Azemi ◽  
Kirpal S. Bisht
Keyword(s):  
Physical Properties ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Core Structure ◽  
Polymer Chains

The spatial directionality of polymer chains in multi-arm polymers can be used to manipulate their thermal and physical properties. Synthesis of directional poly(ε-caprolactone), based on a rigid and flexible resorcin[4]arene initiator core, was accomplished via ring-opening polymerization catalyzed by Sn(Oct)2 in bulk at 120 °C.

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