A major success has been made on organocatalytic ring-opening alternating copolymerization (ROAP) of phthalic anhydride and ethylene oxide (EO) by use a simple phosphazene base (t-BuP1). Polyesters with perfectly sequence distribution, controlled molar masses, low dispersities (ĐM < 1.1) are obtained. The ROAP exhibited distinct living nature so that block, nonlinear, end-functional structures postpolymerization modification the polyesters readily achieved. Solvent, excess EO, catalyst can...

Alcohol-initiated ring-opening alternating copolymerization (ROAP) of phthalic anhydride (PA) and a variety mono-, di-, trisubstituted epoxides has been performed with weak phosphazene base (t-BuP1) as the catalyst. Each product exhibits perfectly sequence distribution, controlled molar mass (Mn up to 124 kg mol–1), low dispersity (ĐM < 1.15, mostly). Full conversion PA can be reached in 0.5–24 h depending on substituent epoxide, targeted degree polymerization, amount t-BuP1 used (0.2–5 mol...

Phthalic anhydride and propylene/ethylene oxide are copolymerized at room temperature by a bicomponent metal-free catalyst comprising mild phosphazene base triethylborane. Provided with proper loadings of the two catalytic components, block copolymers strict (AB)nBm type sequence structures controlled molar mass (up to 60 kg mol-1) can be generated in one synthetic step, architecture enriched use mono-, di-, or tetrahydroxy initiators. The obtained polyester-polyether readily undergo...

Biodegradable polylactide (PLA) composites added with acid oxidized multiwalled carbon nanotubes (A-MWCNTs) of two different aspect ratios (length to diameter) were prepared by coagulation. The and surface structures A-MWCNTs characterized TGA, Raman, SEM measurements. percolation thresholds for gelation in the PLA large small are 2.5 4.0 wt %, respectively, which determined a rheological method, turn, result confirms ratio differences types composites. Isothermal crystallization kinetics...

Positively charged micelles based on a triblock copolymer demonstrate enhanced corneal penetration Jingguo Li, Zhanrong Tianyang Zhou, Junjie Zhang, Huiyun Xia, Heng Jijun He, Siyu Liya Wang Henan Eye Institute, Hospital, Provincial People&rsquo;s Hospital and Zhengzhou University Zhengzhou, People&rsquo;s&nbsp;Republic of China Purpose: The cornea is main barrier to drug after topical application. aim this study was evaluate the abilities generated from positively penetrate Methods:...

One-step synthesis of block copolymer from mixed monomers is great interest and challenge. Using a simple non-nucleophilic organobase as the catalyst, we have achieved sequence-selective terpolymerization mixture phthalic anhydride (PA), an epoxide, rac-lactide (LA). Alcohol-initiated alternating copolymerization PA epoxide occurs first exclusively because substantially more active than LA for reacting with base-activated hydroxyl. When fully consumed, polymerizes termini while excess stays...

In this work, we design and synthesize a kind of amphiphilic mushroom cap-shaped particles with wettability difference on the opposite sides particles. Colloidal crystals consisting uniformly oriented anisotropic were fabricated water-air interface based This simple approach offers new way for self-assembly colloidal crystal by

Narrowly dispersed amphiphilic PMA-<italic>g</italic>-PMMA/PDMA DBCs with high molecular weight were efficiently synthesized by Pickering emulsion template directed radical polymerization of macromonomer micelles.

Y-shaped amphiphilic PS–(PDMAEMA)₂ miktoarm star copolymers stabilized o/w macroemulsion showed pH-induced demulsification and thermo-induced phase inversion.

We studied the influence of microstructure on chromatographic behavior gradient copolymers with different strengths and block copolymer completely segregated blocks by using liquid adsorption chromatography (gLAC) at critical conditions (LCCC) for one constituents. The consist repeating units poly(propylene oxide) phthalate) have comparable average chemical composition molar mass, a narrow mass distribution to avoid as much possible these parameters elution copolymers. On both reversed...

Abstract Polyolefin‐ b ‐poly(ethylene oxide) (PEO) represents the most widely investigated amphiphilic block copolymers. So far, one‐pot continuous synthesis of such hybrid copolymers has only been fulfilled by anionic polymerization through sequential addition vinyl monomers and ethylene oxide (EO). It still remains challenging to achieve altogether high efficiency, molar mass for PEO. Here, we report a copolymerization approach polyisoprene/polystyrene(PI/PS)‐ ‐PEO, in which PI/PS are...

Abstract A series of ester‐ether copolymers were obtained via the reaction between α , ω ‐dihydroxyl poly( ϵ ‐caprolactone) (PCL) and ethylene oxide (EO) or monosubstituted epoxides catalyzed by strong phosphazene bases. The two types monomeric units distributed in highly random manners due to concurrence epoxide ring‐opening fast transesterification reactions. substituent showed an interesting bidirectional effect on enzymatic degradability copolymer. Compared with PCL, derived from EO...

Well-defined PU-<italic>g</italic>-PDMA graft copolymers with controlled densities and grafted chain lengths could be facilely synthesized by combining the polyaddition reaction RAFT polymerization.

In the present study, synthesis of water-soluble thermo-responsive brush copolymers via “graft through” strategy that is conducted on surfaces macromonomer micelles and their application as emulsifiers for emulsions are reported. Water-soluble poly(N,N-dimethylacrylmide)-block-poly(N-isopropylacrylmide) (PDMA-b-PNIPAM) diblock carrying a hydrophobic polymerizable vinyl group at end PDMA block synthesized by reversible addition-fragmentation chain transfer polymerization click...

The presence of lympho-vascular invasion (LVI), spread through air spaces (STAS) and Grade 3 pattern (from the International Association for Study Lung Cancer grading system) have been related to aggressive phenotype worse prognosis in patients with lung adenocarcinoma, but associations differences genomics these pathologic features are largely uncharacterized. A total 1306 next-generation sequencing (NGS) samples evaluated at least one pathological features, were included analysis genomic...

Abstract One‐step synthesis of well‐defined block copolymer is great fundamental and practical values. Here, an aromatic‐aliphatic copolyester one‐step synthesized from the mixture phthalic anhydride (PA), cyclohexene oxide (CHO), δ ‐valerolactone ( ‐VL) at room temperature in presence a metal‐free Lewis pair catalyst consisting triethylborane excess phosphazene base. Alcohol‐initiated ring‐opening alternating copolymerization PA CHO occurs first selectively because overwhelmingly higher...

Bottlebrush polymers (BBPs) have gained wide attention for their special characters, such as rigid main/side chains, stemming from the exceedingly high graft density. This study aims to provide a simple synthetic approach BBPs with polyester side chains by merging ring-opening alternating copolymerization (ROAP) and metathesis polymerization (ROMP). A phosphazene base (tBuP1) is employed ROAP of phthalic anhydride epoxide, after which Grubbs third-generation catalyst (G3) added in situ...