1464-69-3Relevant articles and documents
Fabrication of Acidic pH-Cleavable Polymer for Anticancer Drug Delivery Using a Dual Functional Monomer
Zheng, Luping,Zhang, Xiaolong,Wang, Yunfei,Liu, Fangjun,Peng, Jinlei,Zhao, Xuezhi,Yang, Huiru,Ma, Liwei,Wang, Baoyan,Chang, Cong,Wei, Hua
, p. 3874 - 3882 (2018)
The preparation of tumor acidic pH-cleavable polymers generally requires tedious postpolymerization modifications, leading to batch-to-batch variation and scale-up complexity. To develop a facile and universal strategy, we reported in this study design and successful synthesis of a dual functional monomer, a-OEGMA that bridges a methacrylate structure and oligo(ethylene glycol) (OEG) units via an acidic pH-cleavable acetal link. Therefore, a-OEGMA integrates (i) the merits of commercially available oligo(ethylene glycol) monomethyl ether methacrylate (OEGMA) monomer, i.e., hydrophilicity for extracellular stabilization of particulates and a polymerizable methacrylate for adopting controlled living radical polymerization (CLRP), and (ii) an acidic pH-cleavable acetal link for efficiently intracellular destabilization of polymeric carriers. To demonstrate the advantages of a-OEGMA (Mn = 500 g/mol) relative to the commercially available OEGMA (Mn = 300 g/mol) for drug delivery applications, we prepared both acidic pH-cleavable poly(?-caprolactone)21-b-poly(a-OEGMA)11 (PCL21-b-P(a-OEGMA)11) and pH-insensitive analogues of PCL21-b-P(OEGMA)18 with an almost identical molecular weight (MW) of approximately 5.0 kDa for the hydrophilic blocks by a combination of ring-opening polymerization (ROP) of ?-CL and subsequent atom transfer radical polymerization (ATRP) of a-OEGMA or OEGMA. The pH-responsive micelles self-assembled from PCL21-b-P(a-OEGMA)11 showed sufficient salt stability, but efficient acidic pH-triggered aggregation that was confirmed by the DLS and TEM measurements as well as further characterizations of the products after degradation. In vitro drug release study revealed significantly promoted drug release at pH 5.0 relative to the release profile recorded at pH 7.4 due to the loss of colloidal stability and formation of micelle aggregates. The delivery efficacy evaluated by flow cytometry analyses and an in vitro cytotoxicity study in A549 cells further corroborated greater cellular uptake and cytotoxicity of Dox-loaded pH-sensitive micelles of PCL21-b-P(a-OEGMA)11 relative to the pH-insensitive analogues of PCL21-b-P(OEGMA)18. This study therefore presents a facile and robust means toward tumor acidic pH-responsive polymers as well as provides one solution to the trade-off between extracellular stability and intracellular high therapeutic efficacy of drug delivery systems using a novel monomer of a-OEGMA with dual functionalities.
Photoresist resin monomer synthesized from carboxylic acid compound and synthesis method thereof
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Paragraph 0033; 0035-0037, (2020/05/14)
The invention discloses a photoresist resin monomer synthesized from a carboxylic acid compound and a synthesis method of the photoresist resin monomer, and belongs to the field of chemical synthesisand photoetching materials. The structural general formula of the resin monomer is shown in the specification, wherein R is linear chain or branched chain alkyl. The synthesis method of the resin monomer comprises the following steps: carrying out esterification reaction on a vinyl ether alcohol compound and an acrylic acid compound to obtain an intermediate; and carrying out a reaction on the intermediate and 2, 5-dioxobicyclo[2.2. 2]octane-1, 4-dicarboxylic acid to generate the photoresist resin monomer. The resin monomer provided by the invention comprises an acetal structure and polycyclicand polyester structures, can prevent diffusion of a photoacid generator, improve edge roughness, increase contrast and improve resolution, has excellent etching resistance and fat solubility, and issimple and convenient in preparation method.
SALT, ACID GENERATOR, RESIN, RESIST COMPOSITION AND METHOD FOR PRODUCING RESIST PATTERN
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Paragraph 0691; 0692, (2016/12/01)
A salt represented by formula (I): wherein Q1 and Q2 independently represent a fluorine atom or a C1 to C6 perfluoroalkyl group, R1 and R2 in each occurrence independently represent a hydrogen atom, a fluorine atom or a C1 to C6 perfluoroalkyl group, z represents an integer of 0 to 6, X1 represents *—CO—O—, *—O—CO— or —O—, * represents a binding position to C(R1)(R2) or C(Q1)(Q2), A1 represents a C4 to C24 hydrocarbon group having a C4 to C18 divalent alicyclic hydrocarbon moiety, A2 represents a C2 to C12 divalent hydrocarbon group, R3 and R4 independently represent a hydrogen atom or a C1 to C6 monovalent saturated hydrocarbon group, R5 represents a hydrogen atom, a fluorine atom, or a C1 to C6 alkyl group where a hydrogen atom may be replaced by a fluorine atom, and Z+ represents an organic cation.
