- Thermal properties of charring plasticizers from the biobased alcohols, pentaerythritol and 3,5-dihydroxybenzoic acid
-
To be converted into a useful commercial material, poly(vinyl chloride) (PVC) must generally be heavily plasticized. Owing to its high level of chlorine, PVC is not flammable (limiting oxygen index of 45). However, addition of a plasticizer usually imparts appreciable flammability. The plasticizer is often volatilized from the polymer when it is exposed to heat. In general, plasticizers burn readily and may be the source of the flammability of formulated polymers. This flammability might be controlled by using effective plasticizers that promote char formation at the surface of the burning polymer. Two series of charring compounds, pentaerythritol esters containing aromatic moieties and phosphorus esters of 3,5-dihydroxybenzoates, have been demonstrated to be effective plasticizers for PVC. The thermal degradation of both series of compounds has been examined using thermogravimetry and infrared spectroscopy. For both sets of esters, elimination of an acid is a major degradation process. For the degradation of pentaerythritol esters, a carboxylic acid is a primary degradation product. For the alkyl 3,5-(diphenylphosphato)benzoates, degradation may lead to the formation of either a carbon or a phosphorus acid depending on structure.
- Howell, Bob A.,Alrubayyi, Aeshah,Ostrander, Eric A.
-
-
Read Online
- Tough, Long-Term, Water-Resistant, and Underwater Adhesion of Low-Molecular-Weight Supramolecular Adhesives
-
Modern functional adhesives have attracted considerable attention due to their reversible adhesion capacities and stimuli-responsive adhesion behavior. However, for modern functional adhesives, polymeric structures were highly necessary to realize adhesion behaviors. Supramolecular adhesives from low-molecular-weight monomers were rarely recognized. Compared with polymeric adhesive materials, it remains challenging for supramolecualr adhesive materials to realize tough adhesion on wet surfaces or even under water. In this study, a new supramolecular adhesive consisting of low-molecular-weight monomers was successfully designed and prepared. Strong and long-term adhesion performance was realized on various surfaces, with a maximum adhesion strength of 4.174 MPa. This supramolecular adhesive exhibits tough and stable adhesion properties in high-moisture and underwater environments (including seawater). Long-term underwater adhesion tests display the potential application of low-molecular-weight adhesive as a marine adhesive.
- Deng, Yan,Dong, Shengyi,Lai, Jinlei,Li, Xing,Zhao, Gai
-
p. 5371 - 5379
(2020/04/09)
-
- A solid acid catalysis of the preparation process of benzoic acid ester plasticizer (by machine translation)
-
The present invention discloses a solid acidify catalytic benzoic acid ester plasticizer of the preparation process, the preparation method is: to benzoic acid and alcohol as the raw material, with agent and catalyst in direct reaction to produce benzoic acid ester compound; catalytic system of the invention compared with the sulfuric acid, toluene sulfonic acid and sulfuric acid to sodium has a better catalytic activity, so the catalyst less consumption, in addition, because of the use of the is supported on a solid acid catalyst, after the reaction directly filtering can realize the separation of the catalyst, and the catalyst can be reused, makes the production process more simple, and can be basically prevent the generation of waste water, makes the production process more green environmental protection. (by machine translation)
- -
-
Paragraph 0032; 0033
(2017/07/05)
-
- Solubilizing agents/solvents for organic UV filters
-
The invention relates to the use of compounds of the general formula (I) wherein R,R′═HC1-5-hydrocarbon radical, —O—C1-5-oxyhydrcarbon radical and are identical or different R1, R2, R3═H, C1-5-hydrocarbon radical and are identical or different, X,Y═—O—; —O—C(O)—; —(O)C—O— and are identical or different, A=Aα=—O—C(O)—O—; Aβ=R4—CH2C(CH2—)3, Aγ=—C(H)isopropyl, R4═R4δ=—CH3; R4ε=—[CH2—CH(R1)]e-(Y)d—(CH2)c-Ph(R)a, a,b=1 to 5 and are identical or different, c,k=0 to 5 and are identical or different, d,h=0 or 1 and are identical or different, e,g=0 or 1 and are identical or different, f=0 or 1, m=1 to 3, n=0 or 1, as solubilizing agents/solvents for dissolving organic UV filters.
- -
-
Page/Page column 4
(2008/06/13)
-
