翻译定稿

Easy estimation估计of the progress of artificial Weathering风化侵蚀of palm棕榈fiber-polypropylene composites by chemiluminescence化学发光

Date palm leaves were compounded with polypropylene (PP) and UV stabilizers安

定装置稳定器to form composite materials. Residual剩余的thermo-oxidation stability of such composites undergone to accelerated 加速的weathering in Xenotest has been investigated by chemiluminescence method.It has been found that composites are much more stable 稳定的than PP alone which wasattributed to the direct interaction 交互作用of cellulose纤维素fibres (reinforcing effect) and lignin 木质素(anti-oxidation 抗氧化effect) with polypropylene peroxyl过氧化氢radicals. Samples in which polypropylene is compatibilized with cellulose by Epolene E-43 wax are generally less stable than uncompatibilized ones probably because of the pro-initiation正面的开始effect of cellulose on polypropylene oxidation.

1. Introduction

Since 1990 one can register记录登记an increasing interest in the development of industrial and consumer products that combine联合lignocellulosic fibers and plastics. The primary 主要的impetus推动力has come from one of these goals:目标1. To reduce material costs by combining a lower cost material acting as担当filler or extender with a higher cost material.2. To develop products that can utilize利用recycled再循环materials.3. To produce a composite material that exhibits展示specific properties that are superior compared to either ofthe component 成分materials alone (e.g. increased strength to weight ratio, improved abrasion resistance, etc.) The processing temperature of thermoplastics热塑性塑料withcellulosic fibers is limited due to the cellulose degradation降解at higher temperatures. However, it has been reported that no deterioration变坏退化of properties of composite materials containing cellulose was observed观察when processing temperatures are maintained维持below 200.C The composites of cellulose fibers with thermoplastics can withstand抵挡higher stresses压力than either their individual constituent要素because the fibers and matrix interact and redistribute重新分布the stresses. The ability of these two constituents to exchange stresses depends critically主要的on the effectiveness效力of the coupling耦合or bonding黏结between fiber and matrix [6]. It is well known that compatibility兼容性between lignocellulosic materials and the polymer matrix plays a crucial只管紧要的role in determining the properties of a composite. Lignocellulosic materials,which have polar极性hydroxyl groups on the surface, have difficulty in forming well bonded interfaces界面with nonpolar polymer matrix materials such as polyethylene and polypropylene. Various各种各样的chemical reagents试剂have been employed to enhance the compatibility between the constituent materials. These include Epolene E-43 (Maleic anhydride modified polypropylene) [2,7, 8, 11–13],

poly[methylene(polyphenyl isocyanate)](PMPPIC), γ

-methacryloxypropyltrimethoxysilane,poly(propylene acrylic acid) and

poly(propyleneethylene acrylic acid) [7], etc. From the practical viewpoint, the resistance抵抗力of the above materials towards thermo-oxidation should be of