Photoinduced crosslinking of polyolefine blends. I. Crosslinking of LDPE, PP, and LDPE/PP blends

Abstract

SYNOPSISPhotocrosslinking of low-density polyethylene, (LDPE), polypropylene (PP) and their blends was investigated using xanthone and triallyl cyanurate as a photoinitiator and a coagent, respectively. The influence of the change of UV-irradiation conditions on the yield of photoinitiated processes was found to be very similar a t any composition, while the crosslinking efficiency decreases with increase of PP content in the blend. The mechanism of the TAC action in photocrosslinking process was proposed and the effect of TAC reactions is discussed with regards to the effectivity of crosslinking of LDPE, PP, or the blends. 0 1995 John Wiley & Sons, Inc.

Ultraviolet‐induced crosslinking of poly(butylene succinate) and its thermal property, dynamic mechanical property, and biodegradability

“…Therefore, researchers studied ultraviolet irradiation of polyolefin in the 1950s. In the following years, they achieved breakthrough in the penetration depth of ultraviolet and reaction rate of UV‐irradiation 21–28. The problems of UV‐irradiation were solved by several methods such as irradiating sample at temperature near the melting point, using a suitable photoinitiator and a crosslinking agent as additives, and so on.…”

Rheological behavior of polypropylene/layered silicate nanocomposites prepared by melt compounding in shear and elongational flows

“…The modification increases molecular weight distribution owing to the radicals formed simultaneously in polymer materials. [5][6][7][8][9] On the other hand, polymer nanocomposites have recently attracted great interest since they frequently exhibit unexpected hybrid properties synergistically derived from two components. One of the most promising composites would be hybrid systems based on organic polymer and inorganic clay minerals consisting of layered silicates.…”

Reactive compatibilization of polyolefins using low molecular weight polybutadiene

“…The research work has focused on polyolefin blends such as high density polyethylene/polypropene (HDPE/ PP) [1][2][3][4][5][6][7] , low density polyethylene/polypropene (LDPE/ PP) [8][9][10][11] , linear low density polyethylene/polypropene (LLDPE/PP) [12][13][14][15] , LDPE/HDPE [16][17][18][19] and even on such a special blend as isotactic PP/syndiotactic PP 20) . Compounds often used for compatibilization of polyolefins are ethylene-propene copolymers or styrene-buta-diene block copolymers.…”