Enlightening Freeze–Thaw Process of Physically Cross-Linked Poly(vinyl alcohol) Hydrogels by Aggregation-Induced Emission Fluorogens

2019 ◽  
Vol 1 (6) ◽  
pp. 1390-1398 ◽  
Author(s):  
Javad Tavakoli ◽  
Jason Gascooke ◽  
Ni Xie ◽  
Ben Zhong Tang ◽  
Youhong Tang
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Aggregation Induced Emission ◽  
Freeze Thaw

scholarly journals Enhancing the Freeze-Thaw Durability of Concrete Through Ice Recrystallization Inhibition by Poly(vinyl Alcohol)

2019 ◽  
Author(s):  
Zhengyao Qu ◽  
Shuaiqi Guo ◽  
Christian C. M. Sproncken ◽  
Romà Surís-Valls ◽  
qingliang yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Cement Hydration ◽  
Poly Vinyl Alcohol ◽  
Seasonal Temperature ◽  
Ice Recrystallization Inhibition ◽  
Ice Recrystallization ◽  
Freeze Thaw ◽  
Recrystallization Inhibition ◽  
Durability Of Concrete

Frost weathering of porous materials caused by seasonal temperature changes is a major source of damage to the world’s infrastructure and cultural heritage. Here we investigate poly(vinyl alcohol) (PVA) addition as a means to enhance the freeze-thaw durability of concrete without compromising its structural or mechanical integrity. We evaluate the ice recrystallization inhibition activity of PVA in a cementitious environment and the impact of PVA on key structural and mechanical properties, such as cement hydration (products), microstructure, strength, as well as freeze‑thaw resistance. We find that a low amount of PVA significantly reduces the surface scaling of concrete and displays excellent ice recrystallization inhibition in the saturated Ca(OH)<sub>2 </sub>solution which has a similar pH value as cement pore solution, while it does not affect cement hydration, microstructure, nor its mechanical properties. These findings contribute to new insights on freeze-thaw damage mechanism and more importantly we disclose a new direction for the design of concrete with excellent freeze‑thaw resistance.

scholarly journals Drug Release from Freeze-Thaw Poly (vinyl alcohol) Gel

1987 ◽  
Vol 107 (3) ◽  
pp. 233-237 ◽  
Author(s):  
AKIRA TAKAMURA ◽  
MOTOHARU ARAI ◽  
FUMIYOSHI ISHII
Keyword(s):  
Drug Release ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Freeze Thaw

Structure and Properties of Poly(vinyl alcohol) Hydrogels Obtained by Freeze/Thaw Techniques

2005 ◽  
Vol 222 (1) ◽  
pp. 49-64 ◽  
Author(s):  
Rosa Ricciardi ◽  
Finizia Auriemma ◽  
Claudio De Rosa
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Structure And Properties ◽  
Freeze Thaw

Entrapment of ethyl vanillin in calcium alginate and calcium alginate/poly(vinyl alcohol) beads

2013 ◽  
Vol 67 (2) ◽  
Author(s):  
Steva Levic ◽  
Verica Djordjevic ◽  
Nevenka Rajic ◽  
Milan Milivojevic ◽  
Branko Bugarski ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Poly Vinyl Alcohol ◽  
Gel Formation ◽  
Ftir Analysis ◽  
Ethyl Vanillin ◽  
Freeze Thaw ◽  
Thermal Gravimetry ◽  
The Matrix ◽  
Cross Linker

AbstractElectrostatic extrusion was applied to the encapsulation of 3-ethoxy-4-hydroxybenzaldehyde (ethyl vanillin) in calcium alginate and calcium alginate/poly(vinyl alcohol) beads. The calcium alginate/poly(vinyl alcohol) hydrogel spheres were formed after contact with the cross-linker solution of calcium chloride, followed by the freeze-thaw method for poly(vinyl alcohol) gel formation. The entrapment of aroma in beads was investigated by FTIR and thermal analysis (thermogravimetry/differential thermal gravimetry; TGA/DTG). The mass loss in the temperature range of 150–300°C is related to degradation of the matrix and the release of ethyl vanillin. According to the DTG curve, the release of ethyl vanillin occurs at about 260°C. TGA measurements of the stored samples confirmed that formulations were stable for a period of one month. FTIR analysis provides no evidence for chemical interactions between flavour and alginate that would alter the nature of the functional groups in the flavour compound.

scholarly journals POLYMERIC BIOMATERIALS FILM BASED ON POLY(VINYL ALCOHOL) AND FISH SCALE COLLAGEN BY REPETITIVE FREEZE-THAW CYCLES FOLLOWED BY GAMMA IRRADIATION

2013 ◽  
Vol 13 (3) ◽  
pp. 221-228 ◽  
Author(s):  
Dian Pribadi Perkasa ◽  
Erizal Erizal ◽  
Basril Abbas
Keyword(s):  
Gamma Irradiation ◽  
Vinyl Alcohol ◽  
Testing Machine ◽  
Poly Vinyl Alcohol ◽  
Fish Scale ◽  
Scanning Calorimetry ◽  
Collagen Film ◽  
Freeze Thaw ◽  
Gel Fraction ◽  
Swelling Kinetic

The polymeric biomaterial film based on poly(vinyl alcohol) (PVA) and fish collagen of Lates calcarifer scale were synthesized by three times freeze-thaw cycles followed by gamma irradiation at varied doses of 0, 10, 20, and 30 kGy respectively. Characteristic of PVA/collagen film as effect of constituting polymers and cross linking methods were investigated using Fourier Transform Infrared (FTIR) spectrophotometer, Differential Scanning Calorimetry (DSC), Universal Testing Machine (UTM), and Chroma Mater. Its gel fraction and swelling kinetic were determined by gravimetry. The result showed that IR spectra of controlled and irradiated film demonstrated characteristic vibration bands of both constituting materials. The DSC analysis revealed that gamma irradiation induced interaction between PVA and collagen at molecular level. Improvement of tensile properties by gamma irradiation was observed on tensile strength at 30 kGy with p < 0.05. Gamma irradiation also significantly (p < 0.05) increased yellowness of PVA/collagen film, reduced swelling kinetic, and increased gel fraction of films.

Clustering-triggered Emission of Poly(vinyl) Alcohol

2021 ◽  
Author(s):  
Jingfei Wang ◽  
Lifeng Xu ◽  
Shuangling Zhong ◽  
Yongyan Yang ◽  
Gangying Feng ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Fluorescent Properties ◽  
Aggregation Induced Emission ◽  
Intrinsic Luminescence

Numerous polymers without traditional chromophores show novel fluorescent properties and wide application prospect. This concept is referred to as non-traditional intrinsic luminescence (NTIL). Most polymers show aggregation-induced emission (AIE) characteristics....

Characterizing the Adsorption of Poly(vinyl alcohol) on Colloidal Silica with Aggregation-Induced Emission Fluorophore

Langmuir ◽  
2016 ◽  
Vol 32 (9) ◽  
pp. 2145-2150 ◽  
Author(s):  
Zhichao Zhu ◽  
Xiaobiao Dong ◽  
Guanxin Zhang ◽  
Junfeng Xiang ◽  
Dong Qiu
Keyword(s):  
Vinyl Alcohol ◽  
Colloidal Silica ◽  
Poly Vinyl Alcohol ◽  
Aggregation Induced Emission

scholarly journals Enhancing the Freeze–Thaw Durability of Concrete through Ice Recrystallization Inhibition by Poly(vinyl alcohol)

ACS Omega ◽  
2020 ◽  
Vol 5 (22) ◽  
pp. 12825-12831
Author(s):  
Zhengyao Qu ◽  
Shuaiqi Guo ◽  
Christian C. M. Sproncken ◽  
Romà Surís-Valls ◽  
Qingliang Yu ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Ice Recrystallization Inhibition ◽  
Ice Recrystallization ◽  
Freeze Thaw ◽  
Recrystallization Inhibition ◽  
Durability Of Concrete
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