Internal plasticizer and external plasticizer - ZhangJia Gang
The internal plasticizer has a narrow range of use temperature and must be added to the polymerization process, so the internal plasticizer is less used. An external plasticizer is a low molecular weight compound or polymer that is added to the polymer that needs to be plasticized, which can increase the plasticity of the polymer.
The Epoxidized Vietnam Rubber Seed Oil as a Secondary
Chemical, Japan. The DOP plasticizer (dioctyl phthalate C 24 H 38 O 4), acid stearic 401, and PE wax SCG were of China, Indonesia, and Thai origin, respectively. Rubber seeds were collected in Long Khanh, Dong Nai, Vietnam, after 3 months to dry were pressed in EC company in 364/1 Cong Hoa, Tan Binh, to obtain rubber seed oil
Plasticizers: Types, Uses, Classification, Selection & Regulation
There are two main principal methods exist for plasticization - Internal Plasticization and External Plasticization. Internal Plasticization A polymer can be internally plasticized by chemically modifying the polymer or monomer so that the flexibility is increased.
Polymer plasticizer.
The external plasticizer has more comprehensive performance and convenient production and use, and is widely used. Now the plasticizers are generally said to be external plasticizers. The adjacent benzene two formic acid two ester (DOP) and dibutyl phthalate (DBP) are outside the plasticizer.
Pharmaceutically Used Plasticizers - IntechOpen
phase. Subsequently, the plasticizer diffuses in to the polymer particles. A sufficient amount of time for plasticizer uptake by the polymer particles is necessary to avoid forming an inhomogeneous plasticized system (Bodmeier Paeratakul, 1997). 2.1.4 Plasticizer leaching out of polymer and methods of reduction
- What are plasticizers used for?
- Plasticizers are an important class of low molecular weight non-volatile compounds that are widely used in polymer industries as additives . The primary role of such substances is to improve the flexibility and processability of polymers by lowering the second order transition temperature, the glass transition temperature (Tg).
- What is the molecular size of a plasticizer?
- Plasticizers are, in general, high boiling point liquids with average molecular weights of between 300 and 600, and linear or cyclic carbon chains (14–40 carbons) , . The low molecular size of a plasticizer allows it to occupy intermolecular spaces between polymer chains, reducing secondary forces among them.
- Which polymers are plasticized?
- The plasticizers produced have been applied in 60 polymers and more than 30 groups of products. Industrially, the most common plasticized polymers are PVC, poly (vinyl butyral) (PVB), poly (vinyl acetate) (PVAc), acrylics, cellulose molding compounds, nylon, polyamides and certain copolyamides.
- What are the different types of plasticizers?
- Industrially, the most common plasticized polymers are PVC, poly (vinyl butyral) (PVB), poly (vinyl acetate) (PVAc), acrylics, cellulose molding compounds, nylon, polyamides and certain copolyamides. PVC processing is by far the most important use of plasticizers, consuming over 80% of production , .
- Why do plasticizers soften polymers?
- Internal plasticizers generally have bulky structures that provide polymers with more space to move around and prevent polymers from coming close together. Therefore, they soften polymers by lowering the Tg and, thus, reducing elastic modulus.
- What are natural based plasticizers?
- Nowadays, there is increasing interest in the use of natural-based plasticizers that are characterized by low toxicity and low migration. This group includes epoxidized triglyceride vegetable oils from soybean oil, linseed oil, castor-oil, sunflower oil, and fatty acid esters (FAEs) .
