Preparation and Properties of New Polycarboxylate-Type Superplasticizer

2011 ◽  
Vol 194-196 ◽  
pp. 1122-1125
Author(s):  
Sheng Hua Lv ◽  
Rui Jun Gao ◽  
Jian Ping Duan ◽  
Xiao Liang Yan ◽  
Ming Ming Hou
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Maleic Anhydride ◽  
Sulfonic Acid ◽  
Setting Time ◽  
Monomethyl Ether ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Glycol Monomethyl Ether ◽  
Relative Molecular Weight

A modified polycarboxylate superplasticizer was synthesized by copolymerization of polyethylene glycol monomethyl ether methacrylate (MPEG-MA), β–Cyclodextrins grafted maleic anhydride (MAH-β-CD), methacrylic acid (MAA) and methallyl sulfonic acid (MAS). The excellent superplasticizer was obtained at the molar ratio of n(MAH-β-CD) : n(MAS) : n(MAA) : n(MPEG-MA) was 0.05:0.1:3:1 using ammonium persulfate (APS) as initiator at 90°C for 5 h. The applied results show that the product had many advantages, such as lower dosage, longer setting time, better flow-keeping ability and better compatibility with different cement. Meanwhile, the structure and relative molecular weight were characterized by FTIR and GPC respectively.

Synthesis and Properties of an New Amphoteric Retaning Agent

2012 ◽  
Vol 502 ◽  
pp. 198-202
Author(s):  
Di Li ◽  
Sheng Hua Lv ◽  
Qiang Cao ◽  
Fu Tang Gao
Keyword(s):  
Polyethylene Glycol ◽  
Maleic Anhydride ◽  
Ammonium Chloride ◽  
Methacrylic Acid ◽  
Chemical Structure ◽  
Ammonium Persulfate ◽  
Sulphonic Acid ◽  
Molar Ratio ◽  
Direct Esterification

The mono polyethylene glycol maleate (MPEGM) was prepared by direct esterification of maleic anhydride (MAH) and polyethylene glycol (PEG). The yields of monoester (YM) could reached to 96% when the molar ratio of MAH and PEG was 1.2 using 2 wt% p-toluene sulphonic acid (PTSA) as catalyst at 95°C for 3 h. The amphoteric retaning agent (ARA) with excellent retanning properties was synthesized by copolymerization when the molar ratio of methacrylic acid (MA), MPEGM and dimethyl diallyl ammonium chloride (DMDAAC) was 3 : 1 : 0.2 using 3 wt% ammonium persulfate (APS) as initiator at 90°C for 4 h. The applied results showed that retanned leather by ARA had excellent selective filling and can improve remarkable the flexiblity and elasticity. The chemical structure of the ARA was characterized by FTIR.

Preparation and Properties of Polycarboxylate Superplasticizer with Hydroxy Terminated Side Chains

2012 ◽  
Vol 455-456 ◽  
pp. 600-605
Author(s):  
Sheng Hua Lv ◽  
Jian Ping Duan ◽  
Fang Li
Keyword(s):  
Maleic Anhydride ◽  
Ethylene Oxide ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Side Chains ◽  
Polycarboxylate Superplasticizer ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Maleic anhydride modified polycarboxylates superplasticizes (MPC) was synthesized from allylic poly (ethylene oxide ether) (APEG), maleic anhydride (MAH), sodium methylallyl sulfonate (SMAS) using ammonium persulfate (APS) as initiator. The optimal MPC with best fluidity was got at 90 °C when molar ratio of MAH, APEG, SAMA was 2.75∶1∶0.4 in the present of 4.5 mol% APS of all the monomer molars. MPC which possessed hydroxyl terminated side chains shows some difference in fluidity retarding related to the conventional superplasticizers possessed methoxy terminated side chains.

Preparation and Properties of a Hydrolytically Stable Cyclooctyne-Containing Polymer

Synlett ◽  
2018 ◽  
Vol 29 (19) ◽  
pp. 2535-2541
Author(s):  
Alex Adronov ◽  
Kelvin Li ◽  
Stuart McNelles
Keyword(s):  
Molecular Weight ◽  
Ethylene Glycol ◽  
Monomethyl Ether ◽  
Phenylene Vinylene ◽  
Cross Linking ◽  
Poly Ethylene Glycol ◽  
Ethylene Glycol Monomethyl Ether ◽  
Glycol Monomethyl Ether ◽  
Poly Ethylene

A poly[(phenylene vinylene)-co-dibenzocyclooctyne] polymer prepared by Wittig polymerization chemistry between dibenzocyclooctyne bisaldehyde [DIBO-(CHO)2] and bis(triethyleneglycol)phenylbis(tributylphosphonium) dibromide is reported. The resulting polymer exhibits moderate molecular weight (Mn: 10.5 kDa, Mw: 21.3 kDa, Ð: 2.02) and is fluorescent. It could be readily functionalized by strain-promoted alkyne-azide cycloadditon with different azides, and fluorescence of the polymer was preserved after functionalization. Grafting azide-terminated 5 kDa poly(ethylene glycol) monomethyl ether chains drastically affected the solubility of the polymer. Cross-linking the polymer with poly(ethylene glycol) that was terminated at both ends with azide groups gave access to a fluorescent organogel that could be dried and reswollen with water to form a hydrogel.

Preparation, Purification, and Spectrophotometric Characterization of Cytochrome P450 1A2 Conjugated with Polyethylene Glycol Monomethyl Ether

1996 ◽  
Vol 222 (2) ◽  
pp. 406-409 ◽  
Author(s):  
Roya Nakhgevany ◽  
Osei Bonsu ◽  
Jousephine Barber ◽  
Patricia Ann Mabrouk ◽  
Yune-Fang Ueng ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Polyethylene Glycol ◽  
Monomethyl Ether ◽  
Cytochrome P450 1A2 ◽  
Glycol Monomethyl Ether

Synthesis, Cement Paste Fluidities and Molecular Weight Measurements of Polycarboxylate Superplasticizer by Bulk Polymerization

2013 ◽  
Vol 405-408 ◽  
pp. 2778-2781
Author(s):  
Xiao Liu ◽  
Zi Ming Wang ◽  
Xu Liang ◽  
Jie Zhu ◽  
Jue Zhao
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Solid State ◽  
Maleic Anhydride ◽  
Cement Paste ◽  
Fumaric Acid ◽  
Bulk Polymerization ◽  
Synthesis Process ◽  
The Third ◽  
Polycarboxylate Superplasticizer

The synthesis process of polycarboxylate superplasticizer (PCE) by bulk polymerization was investigated. Compared with BPO as initiator, PCE prepared by using AIBN as initiator exhibited better cement paste fluidities. PCE using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as macromonomer showed excellent fluidities and retaining properties at 80°C and 75°C, respectively. The fumaric acid was more suitable to copolymerize as the third monomer than maleic anhydride. The molecular weight measurements showed that the characteristics of molecular weight and its distribution for all the synthesized samples were in accordance with their cement paste fluidities. The solid-state PCEs can be conveniently dissolved into water to prepare PCE solution with arbitrary concentration, and still with good cement application performances.

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