This work studies the synthesis of copolymers (MACO‐St) of castor oil maleate (MACO) and styrene (St) initiated using benzoyl peroxide (BPO) as free radical initiator through suspension polymerization. The study investigates the effects of temperature (100–140 °C), the molar ratio between styrene and MACO (2:1–4:1), BPO concentration (0.10–0.20 wt%), and water concentration (50–100 wt%) on the molecular weight distribution, thermal stability, viscosity, and biodegradability of the copolymers. Suspension polymerization allows the production of a broad range of number average molecular weight (3465–18 995 g mol⁻¹) and molecular weight distributions with dispersions (Đ) ranging from 1.8 to 4.4. The reaction presents high yields of castor oil into copolymers (>90%), which displays thermal stability up to 200 °C and are highly biodegradable according to the International Organization of Standardization reference.

中文翻译：

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悬浮聚合条件下操作条件对蓖麻油-马来酸酯-苯乙烯共聚合的影响

这项工作研究了使用过氧化苯甲酰（BPO）作为自由基引发剂通过悬浮聚合引发的蓖麻油马来酸酯（MACO）和苯乙烯（St）的共聚物（MACO-St）的合成。该研究调查了温度（100–140°C），苯乙烯与MACO之间的摩尔比（2：1–4：1），BPO浓度（0.10–0.20 wt％）和水浓度（50–100 wt％）的影响％）在共聚物的分子量分布，热稳定性，粘度和生物降解性上。悬浮聚合可以产生广泛的数均分子量（3465–18 995 g mol ^-1）和具有分散体的分子量分布（Đ），范围从1.8到4.4。根据国际标准化组织的参考资料，该反应可将蓖麻油高产率地转化为共聚物（> 90％），显示出高达200°C的热稳定性，并且具有很高的生物降解性。