摘要:
Described herein is the application of centrifugal spinning to provide a polypropylene (PP) nanofiber environment for cell growth. PP nanofiber mats, formed by centrifugal spinning are treated with one or more antimicrobial agents. The treated PP material was shown to have a 10 reduced rate of rejection and promote cell growth and proliferation.
摘要:
The invention relates to a composition, which comprises the components (a) an organic material susceptible to oxidative, thermal or light-induced degradation, which is a polyether polyol, a polyester polyol or a polyurethane; (b) a bisphenolic stabilizer of formula (I) wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11; and (c) a chromanol stabilizer of formula (II) wherein R 1 and R 2 are independently of each other H or C 1 -alkyl. A process for manufacturing the aforementioned composition, the use of an additive mixture comprising component (b) and (c) for stabilizing the component (a) and the additive mixture itself are described.
摘要:
A continuous process for preparing a silylated polymer comprising a silylation step where a prepolymer having reactive functional groups, a first intermediate product, is reacted continuously with a silylatmg agent in an endcapping tubular reaction unit to form a second intermediate product, and where at least a portion of the second intermediate product is backmixed continuously with the first intermediate product to form the silylated polymer. The continuous process may further comprise a stabilization step, a quenching step or both a stabilization step and a quenching step.
摘要:
The present disclosure relates, according to some embodiments, to photostable UV absorbing compositions comprising para-alkoxyl phenyl substituted propenoic acid (APP) derivatives. Furthermore, the present disclosure relates to methods of prolonging the UV absorption capabilities of a composition using photostable UV absorbing compositions comprising APP derivatives.
摘要:
Thiol-terminated polythioether compositions and sealants prepared using the thiol-terminated polythioether compositions that exhibit enhanced retention of elongation following exposure to high temperature are disclosed. The enhanced retention of elongation is realized by incorporating certain phenolic antioxidants into the composition.
摘要:
Novel rubbers are provided which are stabilized by a specific combination of at least three different anti ageing compounds. Said rubbers dispose of an increase storage stability as well as an improved colour stability over the short term as well as over the long term. The invention also relates a process for producing said novel rubbers, vulcanizable mixtures based thereon, a process for producing vulcanizates from these mixtures and the vulcanizates obtained.
摘要:
A polycarbonate composition is disclosed that maintains its color and transparency for long time periods. The composition comprises a polycarbonate polymer formed by a melt process; and a pentaerythritol diphosphite stabilizer; and optionally a phenolic antioxidant. Articles made from the polycarbonate composition are suitable for materials with high thicknesses and high transparency.