Enhancing water resistance of paper by graft copolymerization reaction

2012 ◽  
Vol 127 (6) ◽  
pp. 4446-4455 ◽  
Author(s):  
S. M. Sayyah ◽  
A. B. Khaliel ◽  
E. H. Mohamed
Keyword(s):  
Water Resistance ◽  
Graft Copolymerization ◽  
Copolymerization Reaction

Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

2016 ◽  
Vol 852 ◽  
pp. 979-983
Author(s):  
Ping Rui Meng ◽  
Liang Bo Li
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Permeate Flux ◽  
Ft Ir ◽  
Ethanol Aqueous Solution ◽  
Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

The Compounding and Application Mechanism of Polycarboxylate-Based Superplasticizers in the Self-Compacting Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 711-717 ◽  
Author(s):  
Miao Miao Gui ◽  
Yun Hui Fang ◽  
Zi Dong Lan ◽  
Fei Yu Yu ◽  
Tian Xing Lin ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Graft Copolymerization ◽  
Raw Materials ◽  
The Self ◽  
Main Mechanism ◽  
Self Compacting Concrete ◽  
The Given ◽  
Copolymerization Reaction

Polycarboxylate-based superplasticizers are synthesized by radical graft copolymerization reaction, and the products are divided into ester series (PC-1) and ether series (PC-2) on the basis of different big monomers. This article studies on influence of the different composition and dosages of the synthetic superplasticizers in the self-compacting concrete (SCC). The results show that the requirements of SCC workability can be achieved through simple adjustment kinds and dosages of the synthetic superplasticizers under the given mix proportions and the raw materials. And the main mechanism of the polycarboxylate-based superplasticizers is steric hindrance effect.

scholarly journals Preparation and properties of a thin membrane based on sodium alginate grafting acrylonitrile

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50626-50633 ◽  
Author(s):  
Lijun Yang ◽  
Jing Guo ◽  
Jing Wu ◽  
Yunming Yang ◽  
Sen Zhang ◽  
...  
Keyword(s):  
Free Radical ◽  
Sodium Alginate ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Thin Membrane

Sodium alginate was modified for water resistance with acrylonitrile via by free radical graft copolymerization.

The Synthesis of Eco-Friendly Silicone-Modified Polyacrylate Pigment Printing Binding Agent

2012 ◽  
Vol 476-478 ◽  
pp. 661-664 ◽  
Author(s):  
Jian Ping Chen ◽  
Heng Quan ◽  
Wei Li Shi ◽  
Li Jie Ni ◽  
Kai Chen Lei ◽  
...  
Keyword(s):  
Coupling Agent ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Polymerization Process ◽  
Binding Agent ◽  
Environment Friendly ◽  
Organic Silicon ◽  
And Performance

The environment-friendly silicone-modified acrylate is made through the emulsion of the polymerization. Research shows that time of organic silicon prepolymerization, quantity of organic silicon graft copolymerization, catalysts and its dosage, dosage of the coupling agent have significantly effect on the acrylate adhesives polymerization process and performance of product. The polysiloxane can resistant to heat and is hydrophobic, breathe freely and feels soft smooth. It can improve the water resistance of the film, and stanning resistance, softness and significant flexibility and wet rubbing fastness and so on.

EPDM/St-An graft copolymerization reaction behavior by phase inversion emulsion and the toughness effect of EPDM-g-SAN on SAN resin

2007 ◽  
Vol 107 (5) ◽  
pp. 3393-3400 ◽  
Author(s):  
Jingqi Dai ◽  
Lianshi Wang ◽  
Tongmin Cai ◽  
Anqiang Zhang ◽  
Xiangbin Zeng
Keyword(s):  
Phase Inversion ◽  
Graft Copolymerization ◽  
Reaction Behavior ◽  
Copolymerization Reaction

Experiments on Water Resistance

1908 ◽  
Vol 66 (1719supp) ◽  
pp. 373-373
Author(s):  
Karl Wallin
Keyword(s):  
Water Resistance
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