scholarly journals Biodegradability of lactide–caprolactone macromonomers in wastewater

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4081-4092
Author(s):  
Roderquita K. Moore ◽  
Roland Gleisner ◽  
Carl J. Houtman
Keyword(s):  
Molecular Weight ◽  
Weight Loss ◽  
Pharmaceutical Products ◽  
Proton Nuclear Magnetic Resonance ◽  
Pressure Sensitive Adhesive ◽  
Magnetic Resonance Data ◽  
Pressure Sensitive ◽  
Weight Loss Data ◽  
Resonance Data ◽  
Alternative Material

A desire to develop biorenewable materials has led to lactide–caprolactone copolymers being used in adhesive, medical, and pharmaceutical products. Use of this alternative material may diminish human impact on the environment and create products that are biocompatible. One advantage of these materials compared with other typical petroleum-based polymers is that they are easily degraded by microorganisms. In this study, the biodegradation of representative lactide–caprolactone macromonomers and an acrylic pressure sensitive adhesive incorporating these macromonomers was followed by a respirometric method using a consortium of microorganisms found in a typical wastewater treatment facility. The weight loss data of lactide–caprolactone macromonomers showed that the lowest molecular weight macromonomers with a high percentage of lactide had the greatest weight loss, which could have been caused by the greater number of ester linkages. Proton nuclear magnetic resonance data showed that for lower molecular weight copolymers, there was a preferential loss of caprolactone. Promisingly, testing of the full acrylic adhesives showed that they were easily degraded and thus provided a route to more environmentally friendly adhesive products.

Medicated Pressure Sensitive Adhesive Patches from STR-5L Block Rubber: Effect of Preparation Process

2017 ◽  
Vol 751 ◽  
pp. 236-241 ◽  
Author(s):  
Ekwipoo Kalkornsurapranee ◽  
Rungtiwa Waiprib ◽  
Wiwat Pichayakorn
Keyword(s):  
Mixing Time ◽  
Pharmaceutical Products ◽  
Holding Time ◽  
Hydroxyethyl Cellulose ◽  
Preparation Process ◽  
Pressure Sensitive Adhesive ◽  
Lap Shear ◽  
Pressure Sensitive ◽  
Paraffinic Oil ◽  
Initial Viscosity

STR-5L is a high quality block rubber in Thailand that is interesting to apply in medical and pharmaceutical products because it has very low impurity but high uniformity. In this study, medicated pressure sensitive adhesive (PSA) patches were developed by melt blending technique using hydroxyethyl cellulose (HEC) as tackifier and paraffinic oil as softener. Two rolls mill was used to blend all ingredients and the thin PSA patches were rolled out. Various preparation parameters were studied such as initial viscosity of rubber (60 or 80 Mooney viscosity; MV), mastication time (5-20 minutes), step of mixing, mixing time (35-80 minutes) and gap between rollers (0.1-0.4 mm). The suitable processing conditions were optimized. It was found that the rubber having initial viscosity of 80 MV provided better physical properties, for example, higher force T-peel, lap shear strength and shear holding time. Longer mastication time increased the shear holding time of patches. At 70 minutes of mixing time, the patches showed the highest shear holding time and did not leave any residue on the testing equipment surface. Moreover, the shear holding time decreased when the gap between rollers was expanded. Mixing method with the sequential addition of STR-5L, HEC and then paraffinic oil, provided good PSA patches. However, preparation process did not affect the plasticity retention index of PSA patches due to there were not significant change of values when those all parameters were varied. Next, lidocaine or its hydrochloride salt in powder form could be blended into this PSA to be the homogeneous patches. This lidocaine PSA patches for local anesthetics application on the skin would be evaluated in further study.

scholarly journals Photoresponsive, switchable, pressure-sensitive adhesives: influence of UV intensity and hydrocarbon chain length of low molecular weight azobenzene compounds

RSC Advances ◽  
2021 ◽  
Vol 11 (59) ◽  
pp. 37392-37402
Author(s):  
Tae-Hyung Lee ◽  
Gi-Yeon Han ◽  
Mo-Beom Yi ◽  
Jae-Ho Shin ◽  
Hyun-Joong Kim
Keyword(s):  
Molecular Weight ◽  
Adhesion Force ◽  
Hydrocarbon Chain ◽  
Low Molecular Weight ◽  
Pressure Sensitive Adhesive ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Hydrocarbon Chain Length ◽  
Low Molecular Weight Compounds ◽  
Uv Visible

A photoresponsive switchable pressure-sensitive adhesive (PSA) was fabricated with an azobenzene-containing polymer and low molecular weight compounds. Its adhesion force was activated/deactivated rapidly by UV/visible light irradiation.

Study on Preparation and Properties of Pressure Sensitive Adhesive of Acrylate Prepared by Miniemulsion

2011 ◽  
Vol 183-185 ◽  
pp. 1938-1941
Author(s):  
Jiu Yin Pang ◽  
Chuan Sun ◽  
Shi Cheng Zhang ◽  
Zhen Xing
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Vinyl Acetate ◽  
Butyl Acrylate ◽  
Peel Strength ◽  
Excellent Performance ◽  
Pressure Sensitive Adhesive ◽  
Pressure Sensitive

Miniemulsion was prepared by means of different ratio of butyl acrylate with vinyl acetate emulsion pressure sensitive adhesive excellent performance. Focused on acrylic acid and vinyl acetate copolymers of different proportions of the glass transition temperature, molecular weight and molecular weight distribution of micro-factors, and build the macroscopic properties of the copolymer glass transition temperature and molecular weight between contacts. The use of APS as initiator under the conditions of the experiment found that with the increase of acrylic, PVC-floor, 180 peel strength composite materials decreased. While the molecular weight of butyl acrylate with the increase of the amount did not change significantly, the initial viscosity of the polymer and 180 º peel strength is improved, but the adhesive holding down quickly.

The Entanglement Plateau in the Dynamic Modulus of Rubbery Styrene—Diene Block Copolymers. Significance to Pressure-Sensitive Adhesive Formulations

1979 ◽  
Vol 52 (2) ◽  
pp. 278-285 ◽  
Author(s):  
G. Kraus ◽  
K. W. Rollmann
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Simple Procedure ◽  
Continuous Phase ◽  
Low Molecular Weight ◽  
Glass Transitions ◽  
Pressure Sensitive Adhesive ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Dynamic Storage

Abstract Styrene-diene (butadiene or isoprene) block copolymers of the SDS or (SD−)x type exhibit a plateau in the dynamic storage modulus located between the glass transitions of the polydiene and polystyrene domains. When the polydiene is the continuous phase, the height of this plateau can be estimated with good success from the entanglement spacing molecular weight of the polydiene and the filler effect of the polystyrene domains. The effect of introduction of a center block-compatible diluent can also be calculated, although the simple procedure used here tends to underestimate the plasticizer effect, particularly at high diluent concentration. Nevertheless, the calculation furnishes a useful criterion of compatibility of the polydiene center blocks and low molecular weight resins used commonly as tackifiers in pressure-sensitive adhesives. Center block compatibility is essential for the development of tack in these compositions.

Passivation of pressure sensitive adhesive stickies by addition of acrylic fibers to OCC pulp before papermaking

TAPPI Journal ◽  
2016 ◽  
Vol 15 (10) ◽  
pp. 631-639
Author(s):  
MOHAMMAD HADI ARYAIE MONFARED ◽  
HOSSEIN RESALATI ◽  
ALI GHASEMIAN ◽  
MARTIN A. HUBBE
Keyword(s):  
Adverse Effects ◽  
Control Sample ◽  
Pressure Sensitive Adhesive ◽  
Acrylic Fiber ◽  
Burst Strength ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Tear Index ◽  
Breaking Length ◽  
Acrylic Fibers

This study investigated the addition of acrylic fiber to old corrugated container (OCC) pulp as a possible means of overcoming adverse effects of water-based pressure sensitive adhesives during manufacture of paper or paperboard. Such adhesives can constitute a main source of stickies, which hurt the efficiency of the papermaking process and make tacky spots in the product. The highest amount of acrylic fiber added to recycled pulps generally resulted in a 77% reduction in accepted pulp microstickies. The addition of acrylic fibers also increased pulp freeness, tear index, burst strength, and breaking length, though there was a reduction in screen yield. Hence, in addition to controlling the adverse effects of stickies, the addition of acrylic fibers resulted in the improvement of the mechanical properties of paper compared with a control sample.

Methods to Determine Phytopharmaceuticals in Tobacco and Tobacco Products. 4th Report: A Procedure to Determine Vamidothion and its Metabolites/Methoden zur Bestimmung von Phytopharmaka in Tabak und Tabakerzeugnissen: IV. Mitteilung: Ein Bestimmungsverfahren fuer Vamidothion und seine Metaboliten

1977 ◽  
Vol 9 (2) ◽  
Author(s):  
A.N. Sagredos ◽  
R. Moser
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Acetic Acid ◽  
Magnetic Resonance ◽  
Aluminium Oxide ◽  
Nuclear Magnetic Resonance Data ◽  
Gas Chromatograph ◽  
Tobacco Products ◽  
Magnetic Resonance Data ◽  
Resonance Data

AbstractBased on previous work (7) a method to simultaneously determine vamidothion [I], vamidothion-sulfoxide [II] and vamidothion sulfone [III] in tobacco has been developed. The compounds are extracted with water/acetone/acetic acid from the tobacco, cleansed over an aluminium oxide column and then determined on the gas chromatograph with the specific sulphur detector. Rates of recovery are 70 % - 92 %, the determination level is 0.1 ppm. Mass spectrometry and nuclear magnetic resonance data of vamidothion [I], vamidothion-sulfoxide [ II ] and vamidothion-sulfone [III] are given.

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